Accounting for Nutrient Content of Manure

Brian Krienke Author

01/22/2019 Added

18 Plays

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Managing Manure Nitrogen for Land Application Training 2019

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[00:00:05.110]Welcome, I'm Brian Krienke.
[00:00:07.100]I'm an Extension Educator in the Agronomy
[00:00:09.290]and Horticulture Department at UNL
[00:00:12.250]based in Lincoln on the campus.
[00:00:14.930]I'm gonna talk to you today about
[00:00:16.600]how to account for nutrient content of manure,
[00:00:19.870]specifically nitrogen and phosphorus
[00:00:21.980]will be our focus for this presentation.
[00:00:26.000]And so the objectives I wanna be able
[00:00:28.310]for you to complete by the end of this presentation
[00:00:31.940]is number one, you should be able to identify
[00:00:35.540]two different forms or more of nitrogen
[00:00:38.780]that exists in manure.
[00:00:41.070]And you need to be able to use a lab report
[00:00:44.240]so that you can appropriately calculate
[00:00:46.140]the amount of nitrogen that is available
[00:00:48.840]or will be available to your crop
[00:00:51.250]and the phosphorus content from any
[00:00:53.700]manure applications you to intend to apply.
[00:00:58.150]So the question is how much manure to apply?
[00:01:02.970]Well, because of the regulations
[00:01:05.520]are such in Nebraska Title 130,
[00:01:08.660]they specify that any application of manure
[00:01:12.480]should be based on nitrogen from all sources.
[00:01:15.920]So whether that be inorganic fertilizer
[00:01:18.300]such as urea ammonium nitrate
[00:01:20.690]or some type of feedlot manure
[00:01:23.010]or any of the other types of manure.
[00:01:27.740]So how do you know how much nitrogen
[00:01:30.580]or phosphorus is in your manure?
[00:01:32.780]So we're gonna focus on the nitrogen piece first.
[00:01:35.870]Now there's an excellent resource available.
[00:01:38.340]It's NebGuide G1335.
[00:01:40.860]I'll be referencing it several times
[00:01:43.170]throughout this presentation.
[00:01:45.110]And it goes through step-by-step on how to do
[00:01:49.340]most of this presentation.
[00:01:51.460]But here's an excerpt of Table one
[00:01:53.360]and on this table it shows various
[00:01:55.730]different species of animal and the types of manure
[00:01:59.010]that might result from those.
[00:02:00.560]And then it goes into a breakdown of the ammonium nitrogen,
[00:02:04.800]organic nitrogen, phosphate, and potash.
[00:02:08.420]Basically, what you'll find out here in a few slides
[00:02:11.940]is the ammonium nitrogen is readily available
[00:02:14.270]and readily lost.
[00:02:15.600]And the organic nitrogen form is a slow-release.
[00:02:19.200]So these are book values if you will.
[00:02:22.900]They're no replacement for a good lab test,
[00:02:25.340]but they are there as a helpful indicator
[00:02:29.640]maybe for planning purposes or if for some reason
[00:02:32.670]you cannot get a lab analysis done.
[00:02:36.580]So the best thing of course you can do
[00:02:39.120]is submit your samples to the lab and get your own value,
[00:02:41.660]but again use this as a book value if you absolutely cannot.
[00:02:46.170]So just very briefly on phosphorus
[00:02:48.310]and the rest of the presentation will be on nitrogen,
[00:02:51.970]what determines phosphorus availability in manure?
[00:02:55.570]It's really determined by your soil test phosphorus.
[00:02:58.370]And that might seem counterintuitive
[00:03:00.410]because what does the soil test phosphorus
[00:03:02.920]have anything to do with what's in your manure?
[00:03:05.490]Well, it doesn't.
[00:03:07.160]But the way we relate that is
[00:03:10.410]long-term, if you apply phosphorus fertilizer
[00:03:13.320]whether a manure or an inorganic form
[00:03:16.070]such as monoammonium phosphate or MAP 11-52-0
[00:03:20.360]that phosphorus will be available eventually
[00:03:24.090]to the crop in 100% of its value.
[00:03:26.800]But the first year due to plant growth,
[00:03:29.650]root growth, access to the nutrient where it's applied,
[00:03:33.450]maybe roughly 70% is being able
[00:03:36.390]to be captured by the plant.
[00:03:38.140]And so what we recommend is if your soil test value
[00:03:41.100]is below the critical value
[00:03:43.120]depending on the crop you're growing,
[00:03:45.420]that you use a 70% availability factor.
[00:03:49.040]However if the soil test P is above that
[00:03:52.680]and you're sitting comfortably
[00:03:54.290]with good nutrition in your soil,
[00:03:56.590]you should credit 100% of the phosphorus that you apply.
[00:03:59.770]And there's ranges in what it takes to actually
[00:04:02.290]raise your soil in parts per million with a pound of P2O5.
[00:04:07.940]It can go anywhere from eight to 20 pounds of phosphorus.
[00:04:11.730]So the best way of course with any of these methods
[00:04:14.610]is the soil test and repeat soil test in the same areas.
[00:04:18.050]And so that's covered in other areas of the training.
[00:04:20.170]We're not gonna focus on that in this presentation.
[00:04:23.560]So sample, know your recs.
[00:04:27.270]So now transferring the nitrogen,
[00:04:29.750]there are two main forms of nitrogen in manure.
[00:04:32.970]There's actually a third,
[00:04:34.610]but it's really inconsequential.
[00:04:36.900]And so if you're gonna look at a breakdown
[00:04:39.130]of the total nutrients in a manure sample,
[00:04:41.560]and in this case we're using open feedlot manure.
[00:04:45.240]This is the same analysis you're gonna use
[00:04:47.140]on your calculation exercise as we go.
[00:04:50.020]So you're tuned into that on your handout
[00:04:52.940]that you have in front of you.
[00:04:55.210]So basically, if you look at what's the breakdown of manure
[00:04:59.290]only 1.4% in this particular type of manure is nitrogen.
[00:05:04.930]That's all forms of nitrogen.
[00:05:06.450]A little bit greater than 1% phosphorus, potassium.
[00:05:10.220]And then it starts to get very diminishing
[00:05:12.250]in terms of percentages.
[00:05:13.400]Sulfur's only 0.4%.
[00:05:16.010]And the other 95 or so percent is a mixture
[00:05:19.120]of water, carbon, micronutrients,
[00:05:22.390]magnesium, calcium, those sort of things.
[00:05:25.330]But we're interested in the nitrogen fraction.
[00:05:28.090]And of the percent nitrogen,
[00:05:30.360]there's nitrate.
[00:05:31.860]But usually this is really small or even zero,
[00:05:34.860]inconsequential to calculate.
[00:05:37.240]There's ammonium which we call readily available.
[00:05:42.150]And there's organic nitrogen which makes up
[00:05:45.040]the large bulk in this specific manure.
[00:05:47.555]Slurries might be skewed the other direction
[00:05:51.440]where they have more ammonium than they do organic,
[00:05:54.610]therefore less slow-release.
[00:05:56.770]But since we're focusing on feedlot
[00:05:58.490]for this presentation and examples,
[00:06:02.040]you can see that organic nitrogen makes up the bulk,
[00:06:05.110]so you have a lot of slow-release potential
[00:06:06.920]from this product.
[00:06:09.210]But how much does it release
[00:06:12.220]and how long does it take to release?
[00:06:13.810]That is a critical point because you need
[00:06:15.620]to account for this when you're applying
[00:06:17.620]so you don't end up wasting money,
[00:06:20.030]over-applying that your crop can't use,
[00:06:23.590]environmental concerns and so forth.
[00:06:26.300]So based on the table that's found in NebGuide G1335
[00:06:31.910]and your manure management calendar
[00:06:34.990]where it's simplified and all put on the same page,
[00:06:37.520]there's a table in there that shows
[00:06:39.330]the breakdown of release,
[00:06:41.710]availability of the ammonium fraction
[00:06:44.960]which is the urine and the solid fraction
[00:06:47.180]which is the organic slow-release.
[00:06:49.850]And so these are just table lookup values.
[00:06:52.330]25% of feedlot manure's roughly available
[00:06:55.440]within the first year.
[00:06:57.200]Then it goes down 15 the second year.
[00:07:00.130]15% of the original total.
[00:07:04.030]So if there was 100 pounds available,
[00:07:06.560]the first year there's 25,
[00:07:07.940]the second year there's 15 and so forth,
[00:07:10.390]and it goes down to 7% and then 4%.
[00:07:13.420]And then after four years we don't account for it anymore
[00:07:16.950]because it's too small to account for.
[00:07:21.180]And so what depends or what changes rather
[00:07:26.230]the content and availability really depends
[00:07:28.760]on several things, the species of animal,
[00:07:31.970]whether it's liquid or solid.
[00:07:33.100]We already talked a little bit about
[00:07:34.460]a slurry versus a solid would have
[00:07:36.210]a different composition of ammonium
[00:07:38.670]versus slow-release organic nitrogen.
[00:07:41.420]The type of method you apply it with,
[00:07:43.570]whether you broadcast it through a sprinkler system,
[00:07:46.600]broadcast it on the land,
[00:07:48.150]whether you incorporate it, whether you inject it,
[00:07:50.130]all that has a dramatic effect
[00:07:51.950]on the availability of the different sources.
[00:07:55.320]And then one of the biggest drivers here is the weather.
[00:07:59.460]The weather really has a strong effect
[00:08:01.480]on the ammonium and that is remaining
[00:08:04.980]for use by your crop the following year
[00:08:06.960]and whether you incorporate.
[00:08:09.780]So as an example,
[00:08:12.540]let's look at the effect of weather on ammonium.
[00:08:15.695]NH4+ is ammonium if you're not familiar with that.
[00:08:19.140]Here's a look at availability.
[00:08:21.030]So over here you have a table that looks at conditions
[00:08:26.030]after application and how many days have passed
[00:08:29.450]before you incorporate it.
[00:08:31.330]One day after application you incorporate it
[00:08:33.450]at three and seven.
[00:08:34.840]And then over on the left you have
[00:08:36.980]the warm dry days, the warm wet days,
[00:08:40.570]and you have the cool days.
[00:08:42.680]So just contrast the warm dry day to the cool day
[00:08:45.850]and what you can see is the warm dry day
[00:08:49.950]immediately one day after it goes from 100% to 50%.
[00:08:53.510]So you've lost 50% of the nitrogen
[00:08:56.110]in ammonium form after just one day.
[00:08:58.860]And then seven days later it goes down to zero.
[00:09:02.200]Contrast that with cool
[00:09:04.090]and you actually have ammonium N sticking around
[00:09:06.730]for even a week later with significant amounts.
[00:09:09.660]So it's important to look at the weather
[00:09:12.360]when you are doing your applications
[00:09:14.080]because if you can plan ahead and save this nitrogen,
[00:09:17.060]that's money you're saving.
[00:09:18.160]That's nutrient content given to your crop
[00:09:20.320]that can now hopefully result in yield
[00:09:22.970]and economic dollars.
[00:09:24.830]So the tables I was referring to
[00:09:26.920]that are in front of you in your handouts
[00:09:29.670]also exist on the management manure,
[00:09:32.210]manure management calendar and NebGuide G1335,
[00:09:36.590]really helpful resources to do this.
[00:09:39.040]And they simplify these various factors
[00:09:41.430]of weather, incorporation, and species of the manure
[00:09:45.280]into table lookup values.
[00:09:48.150]And so on the left is the ammonium table or NH4
[00:09:51.830]readily available and you can see this
[00:09:54.370]mirrors the slide previous which talked about
[00:09:56.570]the weather's affect.
[00:09:58.030]These two columns on the right
[00:09:59.940]refer to slurry and temperature effects.
[00:10:02.310]And then the one we're gonna be using today
[00:10:04.820]is over here which is the solid feedlot manure.
[00:10:10.390]So then that's,
[00:10:11.330]so that's urine, that the ammonium fraction.
[00:10:13.900]On the the right table, the organic nitrogen table,
[00:10:16.650]or the slow-release table if you wanna
[00:10:18.190]think about it that way.
[00:10:19.840]Your first year, there are various species
[00:10:24.140]and types of manure.
[00:10:25.320]So for beef you've got solid versus compost.
[00:10:29.220]Swine, you got fresh versus stored.
[00:10:31.090]So those all have different availability factors
[00:10:33.540]for the first year.
[00:10:35.350]But that's where the differences end.
[00:10:37.710]For the next three years
[00:10:39.280]they all share the same availability factors
[00:10:42.530]with 15%, seven, and 4% remaining.
[00:10:46.120]So a total four years of application available.
[00:10:49.700]This is important so that
[00:10:50.840]when you're doing your calculations in year two
[00:10:53.920]where if you're say in a corn-soybean rotation,
[00:10:56.790]you can account for that extra N
[00:10:58.280]that's still available to that corn crop.
[00:11:02.150]Okay, so let's transition into looking at a lab report.
[00:11:05.960]What do you need to look at?
[00:11:07.960]When should you submit that?
[00:11:09.620]A lot of these topics are gonna be covered
[00:11:11.450]in that portion or module of this training.
[00:11:15.240]I'm just gonna focus specifically on
[00:11:17.680]what it takes to do your calculation.
[00:11:20.140]So the most important thing to consider
[00:11:22.300]is taking the sample of a representative piece of manure
[00:11:28.040]that is actually going to be applied
[00:11:31.420]as that form on your field.
[00:11:33.440]And so then when you submit to the lab
[00:11:35.050]specify your application units of your spreader
[00:11:38.710]whether that's pounds per time,
[00:11:40.120]thousand gallons per acre,
[00:11:42.450]or that sort of thing.
[00:11:44.230]You need to specify that
[00:11:45.577]and the lab report then in as-is basis.
[00:11:48.790]That's critical.
[00:11:50.100]Don't use the dry basis
[00:11:51.870]unless you're trying to compare nutrient changes
[00:11:54.850]in the same manure over time.
[00:11:57.300]But for application, focus on the as-is
[00:11:59.710]and you can if you're using our NebGuide,
[00:12:02.420]ignore the availability for the first year.
[00:12:05.250]So the as-is,
[00:12:07.690]I highlighted the red boxes.
[00:12:09.110]You have the organic nitrogen,
[00:12:11.430]the ammonium nitrate and then
[00:12:13.070]they should sum up for the total.
[00:12:15.560]And you can see in here they basically count
[00:12:18.970]zero for nitrate,
[00:12:20.979]1.9 for ammonium and 16.3 for the organic fraction.
[00:12:26.200]And then if you're gonna use the phosphorus,
[00:12:27.730]which you should,
[00:12:28.900]look at how much phosphorus is gonna be added
[00:12:30.640]to your field as a result,
[00:12:32.380]because the other part of the regulations
[00:12:34.670]is you don't want to put an excessive amount
[00:12:36.910]of P on your field,
[00:12:38.500]raising that P index up to a dangerously high level
[00:12:41.810]and causing concerns there.
[00:12:43.110]And then you'd have to come up with a plan
[00:12:45.100]to get that level back down.
[00:12:46.710]So it's important to be cognizant of both.
[00:12:49.360]But our focus is on the nitrogen for this.
[00:12:54.170]So what tools are at your disposal to do the calculations?
[00:12:57.920]There's a very nice comprehensive
[00:13:00.740]pretty intense software out there that Purdue makes
[00:13:03.560]called The Manure Management Planner.
[00:13:05.670]It even has some GIS components
[00:13:07.820]where you can draw some layers on the web,
[00:13:10.160]import those field boundaries,
[00:13:12.360]and help you make management decisions
[00:13:14.410]and keep records of it.
[00:13:15.870]We're not gonna go through that today.
[00:13:17.150]That's a little bit overkill for what
[00:13:18.520]we need to do in our purposes.
[00:13:20.620]So we're instead gonna focus on that handout
[00:13:23.930]that's also in the manure management calendar
[00:13:25.810]where it has a table that makes it really easy,
[00:13:28.680]even tells you how to the calculations.
[00:13:30.820]And then below where it has the two tables
[00:13:32.960]from G1335 that I referred to
[00:13:35.540]and you've got the Future N Availability table down here.
[00:13:40.070]So what do we need to know?
[00:13:41.950]Well hopefully by now you kinda already have
[00:13:44.660]a picture of what we need to know.
[00:13:45.830]But just to articulate it really clearly,
[00:13:48.830]you need to know the nitrogen needs
[00:13:50.130]of the crop receiving the nitrogen.
[00:13:51.810]And so there's a great resource out there called EC155
[00:13:56.250]and it covers a lot of different crops for Nebraska,
[00:14:00.240]corn, soybeans, sorghum, sugar beet, everything
[00:14:03.890]that usually is relevant in our state.
[00:14:07.200]And it has nitrogen recommendations and calculations
[00:14:09.570]for those various crops.
[00:14:11.690]Then we have to be able to determine
[00:14:13.050]how much is gonna be readily available this year
[00:14:16.140]from the ammonium fraction.
[00:14:19.290]And again use your lab results.
[00:14:21.580]Use the NebGuide or use that calendar sheet
[00:14:24.870]that we will be using.
[00:14:26.530]You need to predict the organic release
[00:14:28.760]so that you don't overshoot in the next years
[00:14:31.160]that are following.
[00:14:32.580]And you really need to know the maximum rate you can apply
[00:14:34.990]to satisfy the nitrogen requirement so you don't overdo it.
[00:14:39.490]So let's actually go through the walk-through
[00:14:41.000]of how to do this calculation together.
[00:14:43.920]We have a scenario.
[00:14:45.510]And the lab analysis that you have in your handout
[00:14:49.480]should match exactly what we're doing
[00:14:51.100]here on the screen.
[00:14:52.880]We have open feedlot manure.
[00:14:55.780]It's going on corn which is following a soybean crop.
[00:15:00.690]We estimate that it's gonna take us three days
[00:15:03.280]to get there and incorporate the manure.
[00:15:06.180]And we're gonna have cool weather.
[00:15:08.650]So what's the first thing we need to do?
[00:15:10.210]So make sure you have the manure management calendar
[00:15:14.580]with the large table and the lookup values
[00:15:17.570]for manure availability below.
[00:15:20.420]And on column A,
[00:15:22.470]it says expected yield.
[00:15:24.450]And so we have a real field that we use for this calculation
[00:15:29.570]and we used a realistic yield goal.
[00:15:31.800]What's a realistic yield goal?
[00:15:33.880]Well to take an objective look
[00:15:35.830]versus picking the high spot as the best,
[00:15:38.800]we use the average across five years
[00:15:42.210]for a given zone or field,
[00:15:44.600]in this case field,
[00:15:46.580]and we added 5% and we came up with 270 bushels per acre.
[00:15:52.730]So I'm skip column B and jump to C
[00:15:55.970]because I incorporated it when I used
[00:15:58.450]the UNL Nitrogen Calculator spreadsheet
[00:16:00.660]which is a nitrogen calculator for corn.
[00:16:03.770]It's a great resource,
[00:16:05.280]really easy to do different scenarios
[00:16:07.260]of nitrogen recommendations using the UNL algorithm.
[00:16:12.240]It accounts for the soybean crop,
[00:16:14.300]the legume credit from the previous year,
[00:16:17.020]soil residual nitrate down to 48 inches.
[00:16:21.090]Whether you sampled that deep or not,
[00:16:22.640]it still gives you the proper credit.
[00:16:25.700]Water, nitrate in the water,
[00:16:27.570]it accounts for those various things.
[00:16:28.900]The only thing I withheld from the calculator
[00:16:31.130]was the manure portion because
[00:16:32.650]we're gonna do that here today.
[00:16:35.130]And the result was 168 pounds of nitrogen per acre.
[00:16:40.180]So then the next column they ask us,
[00:16:43.660]what's the ammonium-nitrogen content of your manure?
[00:16:47.240]So the lab as-is analysis gives us a value of 1.9,
[00:16:52.038]sorry 1.9 pounds of nitrogen per ton.
[00:16:57.230]If we use the lookup table on your calendar
[00:17:00.470]or the G1335 resource,
[00:17:03.940]we look at the urine side or the left lookup table,
[00:17:08.510]we look up the beef and what we see is
[00:17:11.590]if it hasn't been incorporated for three days,
[00:17:14.150]we have a 15% availability.
[00:17:16.030]So we're losing quite a bit of our nitrogen
[00:17:17.900]in the ammonium form by waiting that long.
[00:17:21.670]So how much in total per ton is available?
[00:17:25.560]Well you just simply multiply the two previous columns.
[00:17:29.460]1.9 times 0.15, you get 0.3 pounds of nitrogen
[00:17:33.390]per ton ammonium that is actually available
[00:17:37.000]right away for the crop.
[00:17:38.920]So then crossing over to the right side of the table,
[00:17:41.650]the organic nitrogen fraction
[00:17:44.600]or the solid portion of the waste.
[00:17:47.700]We again look at the value we have solid.
[00:17:51.650]It's beef open lot.
[00:17:54.150]And in the first year that lookup values is 25% available.
[00:17:59.840]And then again the future years
[00:18:02.350]just look at that lower right portion
[00:18:04.760]where it goes 15, seven, four.
[00:18:08.150]And so how do we get what's available for the current year?
[00:18:11.740]It's really simple, you take the nitrogen content
[00:18:14.280]of Organic-N which is 16.3 pounds per ton,
[00:18:18.100]and you multiply it times your availability factor of 25%.
[00:18:21.560]And you're left with 4.1 pounds of nitrogen per ton
[00:18:27.040]available this year.
[00:18:29.990]And so then how much in total is available
[00:18:32.500]from your manure to contribute this year?
[00:18:35.060]It's 4.4 pounds per ton.
[00:18:39.390]And so then you need to calculate
[00:18:41.100]what's the maximum amount of manure you can apply
[00:18:44.320]to then satisfy the nitrogen requirements of your crop.
[00:18:47.480]The requirements are 168 pounds nitrogen per acre.
[00:18:51.350]You divide that by how much content which is j, so 4.4,
[00:18:56.520]and the result is 38 tons per acre
[00:18:59.440]that you can apply to satisfy the nitrogen requirements.
[00:19:03.070]That's your max limit.
[00:19:04.120]You don't have to obviously apply that much,
[00:19:06.460]but you should not go any higher than this.
[00:19:10.390]So that's the current year.
[00:19:13.150]Now let's look at what would happen the following years.
[00:19:16.140]And I'm just gonna use the same 38 tons per acre value.
[00:19:20.160]Of course you're not gonna be applying 38 tons per acre
[00:19:22.850]to the same field every year for four years.
[00:19:25.480]I just wanna show you this as an example
[00:19:27.670]of how much N actually accumulates if you do that
[00:19:31.600]from the following years and the residual effects
[00:19:34.070]of them adding to each other.
[00:19:37.020]So if you use that first year,
[00:19:40.150]you put 168 pounds of N on,
[00:19:42.730]and you came through a year later
[00:19:43.940]and you applied the same amount, same conditions,
[00:19:46.550]how much is left or how much is added?
[00:19:49.330]Well you have a 15% availability this time in year two.
[00:19:52.980]Same amount of content,
[00:19:54.370]16.3 pounds of nitrogen per ton.
[00:19:56.610]That's what the T means.
[00:19:58.120]You take it times the same application rate
[00:20:00.070]of tons per acre, 38.
[00:20:02.080]And you get 92 additional pounds added,
[00:20:05.350]plus the 168 you just readded.
[00:20:08.250]And so that gives you up to 260 pounds of N.
[00:20:12.100]You can continue to do this then for the third year.
[00:20:15.730]And so 168 plus the residual from the previous year of 92,
[00:20:20.060]plus the residual of the first application three years ago
[00:20:23.830]which is 43 pounds.
[00:20:25.530]Now you're up to 395.
[00:20:29.460]The fourth year, same situation,
[00:20:32.090]add the three previous years of residual.
[00:20:35.110]Even in that last year, you're getting 25 pounds of nitrogen
[00:20:38.800]from four years ago from your manure.
[00:20:41.320]And so of course this is,
[00:20:43.010]nobody's gonna put 420 pounds of nitrogen on.
[00:20:45.940]But the whole point is to look at
[00:20:49.320]the content that is still in your system
[00:20:51.660]and that if it's left forgotten,
[00:20:55.240]it could actually cause some damage to your crop
[00:20:57.170]with excessive rates and just wasted money in general.
[00:21:03.040]So for the Land Application Training exercise,
[00:21:06.930]this is where they can pause the video
[00:21:08.880]if you don't have a live presenter
[00:21:11.910]and do this on your own now.
[00:21:13.500]So this time use the same manure.
[00:21:17.070]You're gonna surface apply it at 20 tons per acre
[00:21:20.300]this spring and you're gonna incorporate it two days later.
[00:21:23.630]So what you need to do is you need to go to your lab sheet,
[00:21:26.120]find the proper analysis to use,
[00:21:28.300]and I want you to calculate,
[00:21:29.910]number one, nitrogen value to this year's crop,
[00:21:32.430]number two, nitrogen value to this year's crop
[00:21:35.970]if incorporated immediately versus two days later.
[00:21:40.240]And number three, value to the next three cropping seasons,
[00:21:43.300]so that residual effect.
[00:21:45.020]Show that you're able and confident
[00:21:46.760]to be able to calculate these nitrogen results.
[00:21:53.200]And so then coming back to the presentation now
[00:21:55.870]if you've finished your exercise
[00:21:57.280]and if you've had your questions answered
[00:22:00.440]what does it take to have a successful
[00:22:01.920]nitrogen-based annual plan?
[00:22:04.500]You gotta know what's in your manure.
[00:22:06.800]You have to have a properly calibrated spreader.
[00:22:10.060]You need to know how much N is already,
[00:22:12.230]how much is needed on the field,
[00:22:13.440]how much is already there.
[00:22:15.530]So you have to be able to calculate
[00:22:17.060]what's available in your manure
[00:22:18.720]based on your application methods,
[00:22:20.470]expected weather, that sort of thing.
[00:22:23.350]Make should make sure you're not overdoing the N.
[00:22:26.980]Keep a record of what's future nitrogen release.
[00:22:30.400]And then don't forget the phosphorus.
[00:22:32.830]That's gonna have an effect when you apply
[00:22:34.720]20, 38 tons of the manure per acre.
[00:22:38.100]It's raise your P level.
[00:22:40.910]And those those values vary.
[00:22:43.270]But you know maybe from eight to 20 pounds of phosphorus
[00:22:48.190]might give you an increase of one part per million.
[00:22:50.020]It depends on your soil type,
[00:22:51.440]soil test concentrations.
[00:22:52.810]So there's a lot of variables there.
[00:22:54.920]But putting on that much P
[00:22:56.750]is gonna have a significant impact,
[00:22:58.580]and you wanna prevent you P index
[00:23:00.390]from shooting to the high levels, the very high levels,
[00:23:03.060]and then having to have a plan to deal with that.
[00:23:05.630]For one agronomically, it doesn't make any sense
[00:23:07.790]to have P or N at that level.
[00:23:10.500]And number two, environmentally it's a waste as well.
[00:23:13.740]It puts you at a high risk.
[00:23:17.600]What's the take-home message here?
[00:23:20.690]Obviously, manure has many different
[00:23:23.050]types of value in terms of money.
[00:23:25.450]But nutrient-wise, you're gonna hear
[00:23:27.730]from other presenters that talked about
[00:23:29.210]the other ways to quantify the value of manure.
[00:23:31.610]It's a very rich valuable resource any way you look at it.
[00:23:36.220]Ammonia component and losing that ammonia
[00:23:40.430]is up to you in how you incorporate and the weather,
[00:23:42.700]and when you plan ahead for that sort of application.
[00:23:46.360]The organic release is very valuable,
[00:23:49.010]but don't forget to account for it.
[00:23:50.890]Monitor your phosphorus.
[00:23:52.850]And no matter what you do,
[00:23:54.580]incorporate some type of verification
[00:23:56.560]of what's happening to your actual field.
[00:23:58.970]Monitor your field for sufficiency
[00:24:02.290]or deficiency in nitrogen or other nutrients.
[00:24:06.340]You could use tissue samples,
[00:24:08.380]crop canopy sensors, satellite,
[00:24:10.800]whatever your choice of imagery is.
[00:24:13.060]And of course crosscheck at the end with soil tests
[00:24:15.590]to see where your soil's moving in terms of nutrient trends.
[00:24:19.090]And a very helpful nitrogen test
[00:24:23.070]which can give you a gauge of how efficiently
[00:24:24.980]you use nitrogen is called a stalk nitrate test.
[00:24:28.070]For more information on that look at CropWatch.
[00:24:30.020]We have videos and how-tos.
[00:24:32.610]But this is all part of a comprehensive nutrient
[00:24:34.420]management program not just manure.
[00:24:38.370]With that, I'd like to thank you for tuning in
[00:24:41.270]and learning how to calculate the value of
[00:24:43.390]nitrogen and phosphorus from your manure, thanks.

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Accounting for Nutrient Content of Manure

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