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âWhen you get soybeans up 36 in. or taller at a seeding rate of 120,000-140,000 seeds/acre and you get August rains and humidity that follows, those soybean plants are highly susceptible to disease. Under those conditions is when I think fungicides really help on soybeans,â Moore says.
The soybeans were subjected to three soil conditions immediately after planting: 1  Warm conditions (77 degrees Fahrenheit) for 17 days. 2  Cold soil (45 F) for 20 hours and then warm soil for 17 days. 3  Warm soil followed by cold conditions (eight hours of warm then cold for four days and warm for 13 days) immediately after planting.