Effects of a winter legume on phosphorus,potassium, calcium and magnesium cycling in a humid subtropical agroecosystem |
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| Institution: | 1. Masters student, Natural Resources Institute, University of Manitoba, Winnipeg, Manitoba, Canada;2. Associate Professor, Natural Resources Institute, University of Manitoba, Winnipeg, Manitoba, Canada;3. Canadian Wildlife Service, Saskatoon, Saskatchewan, Canada;1. Fish and Wildlife Biologist, US Fish and Wildlife Service, Bishop, CA 93514, USA;2. Professor, Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT 84602, USA;3. Assistant Professor, Department of Forest, Rangeland, and Fire Sciences, University of Idaho, Moscow, ID 83844, USA;4. Professor Emeritus, Department of Animal and Range Science, Oregon State University, Corvallis, OR 97331, USA;5. Range Scientist, Retired, US Department of Agriculture (USDA) Forest Service, Rocky Mountain Research Station, Reno, NV 89509, USA;6. Research Ecologist, US Department of Agriculture (USDA) Forest Service, Rocky Mountain Research Station, Reno, NV 89509, USA;7. Associate Professor, Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801, USA;8. Assistant Professor, Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801, USA;9. Associate Research Professor, Department of Statistics, Brigham Young University, Provo, UT 84602, USA |
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| Abstract: | Phosphorus, potassium, calcium and magnesium cycling were compared in sorghum agroecosystems with winter legume (Trifolium incarnatum L.) or inorganic fertilizer nitrogen inputs. The system with fertilizer N input had winter rye (Secale cereale L.) as a winter cover crop. Nutrient uptake by winter and summer crops, double acid extractable soil nutrients, soil pH and soil ammonium/nitrate ratio were measured. The legume took up more of all nutrients than the rye and also provided higher amounts of available nutrients in soil for the subsequent summer crop. Soil pH was also increased in the clover-N treatment. Nutrient uptake by winter crops is important for reducing leaching losses and chemical fixation of nutrients in humid subtropical regions. |
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