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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