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Watch for moisture loss
By John Murray and Shawn Collins
Pioneer Hi-Bred agronomists
How much corn moisture is lost per day? Grain loses approximately one point of moisture for each 30 heat units accumulated when the grain moisture is between 30 percent and 25 percent moisture. Between 25 percent and 20 percent moisture, about 45 growing degree units (GDUs) accumulate per point of moisture lost. Physiological maturity or black layer usually occurs at approximately 30 percent to 38 percent moisture.
Wheat seeding rate: Seeding rates vary depending on location and moisture conditions. The best seeding rated for most Wheat varieties is about 500,000 to 800,000 seeds per acre for dryland production, with irrigated acres ranging from 1 million seeds per acre on early planted acres to 1.5 million for late planted wheat. Be sure to adjust your seeding rate based on the germination and live-seed information provided by your seed supplier.
Fall is an ideal time to soil sample for fertility: Soil testing is the most accurate method of determining the limiting fertility levels in the field. The following chart estimates crop removal rates for phosphorus (P) and potassium (K) but a current, properly sampled soil test is a much more accurate indicator of soil fertility needs.
Written in form of: Crop, P2O5, K20;
--Corn (per bu. of grain), .42 lbs., .28 lbs.;
--Corn silage (per ton), 2.65 lbs., 7.00 lbs.;
--Soybeans (per bu. of grain), .85 lbs., 1.30 lbs.
--Alfalfa (per ton), 1.00 lbs., 50.00 lbs.
--Grain sorghum (per bu. of grain), .42 lbs., .26 lbs.
Evaluating Yield Data: With combines rolling, yield data will be on the airwaves and in print soon. Always remember that a single plot or extremely limited data doesn't tell the entire story. Many of you have viewed the table illustrated before. This table illustrates your chances of selecting the right genetics. This shows that even if you know there is six-bushels-per-acre difference between two hybrids, when they are put head-to-head in one plot, there is a 52 percent chance of picking the right one. Pioneer continues to place a major emphasis on collecting a vast amount of information on product performance and positioning across the area. No other company collects as much local information as Pioneer to assist you in positioning genetics on your operation.
Written in form of: Probability of Selecting the Best Genetics, Number of Locations, Measured Yield Difference;
3 Bu./A 6 Bu./A 12 Bu./A
1 51% 52% 60%
10 65% 75% 90%
30 75% 90% 95%
Editor's note: Crop Talk is brought to you by agronomists serving your community to keep you informed about current growing conditions and important management issues. John Murray, Goodland, Kan., and Shawn Collins, Sublette, Kan. are agronomists with Pioneer Hi-Bred.
Date: 9/23/04
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