19 - 2020 Soybean Management Field Days - Soy Planting Date – Vegetative and Reproductive Duration - Cover Crops
Soy Planting Date – Vegetative and Reproductive Duration - Cover Crops - Jim Specht, UNL Emeritus Professor of Agronomy and Horticulture covers the following: Preceding a soybean crop with a cover crop will necessitate delaying the soybean planting date from May 1 to May 15. Let’s examine the impact of this delay on soybean main stem node number accrual and the shorter duration of the soybean reproductive period.
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[00:00:09.620]Okay, my name is Jim Specht,
[00:00:11.530]I'm a professor in agronomy,
[00:00:13.180]now retired at the University of Nebraska,
[00:00:15.470]and my specialty was
[00:00:17.770]soybean physiology and production
[00:00:19.990]in addition to genetics genomics
[00:00:21.960]but today we're gonna focus on physiology
[00:00:24.150]and production of soybean.
[00:00:25.940]So let's talk about the impact
[00:00:27.700]of inserting a cover crop on these two main phases
[00:00:32.490]in soybean stem node accrual and reproductive period.
[00:00:35.930]Here again is the photo you're familiar with by now
[00:00:39.390]and then I'll be using
[00:00:40.300]the red, blue, and green and brown lines.
[00:00:43.570]Again, we're talking about insertion of our cover crop here.
[00:00:47.640]And again, what I show here
[00:00:49.210]is the same slide I showed before.
[00:00:51.470]But this time I'm showing on the left slide
[00:00:54.099]the arrows for V one to V five for May one planting,
[00:00:59.330]which are in red and the arrows for April
[00:01:03.040]or May 15 planning, which would be the amount
[00:01:06.730]of delay you'd have to do with a cover crop.
[00:01:09.420]You can see there's not a lot of difference
[00:01:11.320]but there is some in terms of the stages there.
[00:01:14.430]But if you look at the bottom,
[00:01:15.810]what you see in gray, dark gray,
[00:01:18.640]is the amount of solar radiation
[00:01:20.640]you're not capturing, and therefore you know,
[00:01:24.050]you're shortening your growing season.
[00:01:27.350]Again, so that puts us here again.
[00:01:29.120]Again you can see your planting data on May one.
[00:01:33.160]If it's pushed back to May 15,
[00:01:34.980]to give you a cover crop time to get successful dry matter,
[00:01:38.510]you go here,
[00:01:42.850]and here are the take homes.
[00:01:44.250]So again, cover crop.
[00:01:47.240]You need to give it sufficient time after it's planted
[00:01:50.790]in the fall until April 15 when it greens up.
[00:01:54.930]So acquire the carbon that can be put to the soil.
[00:01:59.130]First of all, health benefit,
[00:02:00.840]but it'll also delay the start of and length of seed node
[00:02:05.000]accrual or stem node accrual
[00:02:07.330]and also less than the amount of time
[00:02:10.680]spent in R one to R five.
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