24 - 2020 Soybean Management Field Days - Row Width
Row Width - im Specht, UNL Emeritus Professor of Agronomy and Horticulture covers the following: Most data to date suggests that soybean yield is greater as the row width is narrowed, particularly in later planting dates, but not so much when soybeans are planted in early May. Surveys of NE soybean producers indicate that the predominate planters are 30-inch or 15-inch, with the former dominating in irrigated production systems. Planting soybeans on the farm quicker in the spring is more likely to enhance yield making a row-spacing choice.
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[00:00:07.730]Okay, my name is Jim Specht,
[00:00:10.060]Professor in Agronomy, now retired at the University
[00:00:12.820]of Nebraska and my specialty was Soybean Physiology
[00:00:17.320]and Production in addition to genetics genomics.
[00:00:20.090]But today we're going to focus on physiology
[00:00:22.260]and production of soybean .
[00:00:24.160]So let's talk about the narrowing of a row
[00:00:26.440]width, to achieve earlier canopy closure.
[00:00:30.580]So here you can see all the results from a 2015 survey
[00:00:34.400]of Nass and what the planting lead choices were
[00:00:39.160]in more central States, including Arkansas.
[00:00:42.700]If you just looked at the green and
[00:00:46.400]red lines, you can see the 30 and 15 inch rows there.
[00:00:49.865]I have more 15 inch rows planted out
[00:00:52.576]East where a lot weight is often included
[00:00:55.770]in the rotation versus in Nebraska and or we there's not.
[00:01:02.120]And here is the Nebraska survey data
[00:01:04.250]and then also the planters there are 30 inch
[00:01:08.580]or 15 inch, 30 inches, use more in the irrigated fields.
[00:01:14.630]And the rain fed fields on 30 and 15 are used about equally.
[00:01:21.950]And so generally speaking there are rows with increase yield
[00:01:26.480]but there's not a direct consensus on how much.
[00:01:33.720]And the key thing is that narrow rows are much better,
[00:01:38.180]when planting is delayed, when you're planting soybeans.
[00:01:41.420]But if you're planting earlier running
[00:01:43.390]than 30 and 15 inches are about the same in yield.
[00:01:48.690]The choice of which row width to use
[00:01:50.550]and not just yield based because crop rotation plays a role.
[00:01:54.490]The cost of having two planters, a 30 inch corn planter
[00:01:59.910]and a 15 inch row planter, and a drill for planting right.
[00:02:03.600]Makes you have to decide, what you're going to invest in.
[00:02:07.540]And the choice honestly for an arrogated region
[00:02:10.958]is there's a 30 inch corn and slaving planter.
[00:02:16.170]Keep in mind that a 15 inch planter is heavier
[00:02:20.400]and thus a 30 inch planter is often wider
[00:02:24.220]cause it's less heavy.
[00:02:25.640]So that 30 inch planter can quickly cover more ground
[00:02:28.750]which means that you can get the last field
[00:02:30.650]on your farm field planted earlier than you can
[00:02:34.043]with a, with a narrower planter, a narrow width planter.
[00:02:39.800]And finally relative to the experiment
[00:02:41.580]we have gone here in this field.
[00:02:44.240]One of the objectives here is to take a look at seeding rate
[00:02:47.760]and row width ,one of our objectives here is to see with and
[00:02:53.100]without a cover crop the impact of a cover crop has on that.
[00:02:57.120]So our ideas is also not only to look at the
[00:03:00.450]part of cover crop and the not cover crop just plain
[00:03:03.770]no till, is how many branches per plant you're getting
[00:03:08.360]because branches can contribute a large proportion
[00:03:12.310]of the pods and seeds in low density plantings.
[00:03:17.140]So I thank you for your attention.
[00:03:20.117]We look forward to you reading the, the booklet.
[00:03:24.220]Book comes out in February that
[00:03:26.845]illustrates all the research that was done.
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