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Cooperative Extension Service |
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Agricultural
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Aquaculture
Dale Bumpers College
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Trends in Soybean Fertilization |
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Year |
Phosphorus |
Potassium |
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| Acres | Avg. Rate | Acres | Avg. Rate | |
| % | lb P2O5/A | % | lb K2O/A | |
| 1964 | 14 | 32 | 12 | 39 |
| 1974 | 31 | 44 | 32 | 52 |
| 1984 | 26 | 40 | 21 | 48 |
| 1994 | 31 | 49 | 32 | 64 |
| 2004 | 38 | 55 | 38 | 81 |
| Source: USDA-NASS, Agricultural Chemical Use Reports | ||||
The data that we have to this date suggests the rate of application is more important than the time that the fertilizer is applied.
[Dr. Slaton] The second really deals with round-up ready technology. We know that the yellow flash that occasionally you see after round-up that is perhaps due to manganese deficiency. [Picture of soybean plants - manganese deficient beans.] We know that we have manganese deficient soils here in the state and [Dr. Slaton] we know that if we do need manganese you need to put it out about 7 or 8 days after a round-up application. You do not need to mix manganese in with round-up because it will antagonize the Round-Up activity and reduce weed control.
The other thing is, especially in areas where we have built a lot of reservoirs, soybean does not like low Ph. If you have silt-loam soils with low Ph, your yields are probably going to suffer. So there is fine line there in managing that soil Ph for rice and doing something for your beans to make sure your not hurting your beans.
Poultry litter, it’s a fine nutrient source for beans. [Slide with table]
| Poultry Litter - Fertilizer Value | ||||
| Nutrient | Fertilizer | Price | Litter 60-60-60 |
Litter 40-40-40 |
| $/ton | Value/ton | |||
| N | Urea | $600 | $19.56 | $13.04 |
| P2O5 | 0-46-0 | $1000 | $65.22 | $43.48 |
| P2O5 | 0-46-0 | $400 | $26.09 | $17.39 |
| K2O | 0-0-60 | $500 | $40.00 | $26.67 |
| Sum | $66.09 | $44.06 | ||
The P and K availability appears to be equivalent to our inorganic fertilizers. Certainly we would encourage you, because every load of poultry litter, every house could be a little bit different and you need to have it chemically analyzed for moisture content and nutrient content. If you are having it delivered to your farm you need to sample it when it is delivered. If you do not sample it until after is has been stacked on the turn row or in the field and been rained on numerous times, [Dr. Nathan Slaton] you’re going to have to put on a pair of hip boots, wade into that dude with a shovel and dig down until you find some dry material.
[Narrator] Your Arkansas Soybean Podcast is a production of the University of Arkansas Division of Agriculture and was funded in part by the Arkansas Soybean Promotion Board. For more information on soybean farming in Arkansas contact your local county Extension Office. [Title slide - For more information contact your local county Extension office. Your Arkansas Soybean Podcast, University of Arkansas Division of Agriculture, Arkansas Soybean Promotion Board]
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University of Arkansas • Division of Agriculture |
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