Effect of Agronomic Practices on Soybean Production and Diseases
Crop Genetics Research Unit
2009 Annual Report
1a.Objectives (from AD-416)
The overall objective is to develop soybean cropping systems that reduce disease and nematode incidence, maximizing yield and economic return.
1b.Approach (from AD-416)
The Tennessee Agricultural Experiment Station (TAES) will use existing and new research plot areas to measure the effects of soybean cropping systems variables, such as no-tillage, cultivar selection, seeding rate, planting date and use of animal waste, on diseases and soybean yield. This will be done on cropping systems experiments already in place at University of Tennessee (UT) and on experiments being conducted by USDA, ARS scientists in the Crop Genetics and Production Research Unit. TAES will provide expertise in possible cropping system changes to enhance economically and enviromentally viable soybean production.
The effects of tilled and no-tilled cropping systems on soil diseases and soybean cyst nematode incidence and severity is being evaluated. Research is underway on a long term soybean experiment comparing single, to double-cropped soybeans and winter wheat. The six main plot treatments include tillage (disc only, chisel plow, and moldboard plow) compared to no-tillage (single crop in winter wheat cover, single crop in previous crop residue, and no-tillage after wheat harvest in a double crop system). Each of the six treatments are split with one half being no-tillage soybeans and the other half being tilled. Sampling is underway on all plots to determine nematode populations, and soil bacterial and fungal levels. Charcoal rot incidence and severity is also being monitored. These same variables are being monitored on a poultry litter study on tilled and no-tilled soybeans to determine if litter affects soybean cyst nematode levels, charcoal rot, and soybean yield. Three poultry litter rates are being compared with surface application in no-tillage, to incorporation and no-incorporation in tilled soybeans. Research is being planned to evaluate disease interactions as affected by soybean cultivars and planting date. Data from these experiments will be used to evaluate potential biological control measure to reduce nematode and disease levels in soybeans. ADODR used site visit, email and telephone conferences to monitor activities of the project.