Effect of nitrogen and potassium on oil yield, nutrient uptake and soil fertility in soybean (Glycine max) - sesame (Sesamum indicum) intercropping system

2001

A:PS

Six combinations of 2 N (20 and 40 kg N/ha) and 3 K rates (0, 33 and 66 kg K/ha) were supplied to soyabean and sesame (as a sole crop) and intercropped soyabean and sesame in a field experiment conducted in West Bengal, India during the rainy and summer seasons of 1994 and 1995. Oil yield of sesame and soyabean as sole crops were higher compared to the oil yield of both crops as intercrops. Highest oil yield of soyabean and sesame was observed with 66 kg K/ha + 40 kg N/ha application. Nutrient uptake by soyabean as a sole crop and combined uptake of nutrients by both intercrops were higher during the rainy season than their respective nutrient uptake during summer. However, nutrient uptake of sesame as sole crop was higher in summer than during the rainy season. Maximum uptake of nutrients in both sesame and soyabean was observed with 66 kg K/ha + 40 kg N/ha application. K content in soyabean and sesame showed negative correlation with disease incidence and positive correlation with their respective yield. Continuous N application resulted in higher N-status in soil. However, application of K with N resulted in a decreasing total N status in soil after the fourth cropping. Continuous application of K with lower N doses caused higher K build-up in sole and intercropping plots compared with higher N dose application.

v.71(1):44-46, INDIAN JOURNAL OF AGRICULTURAL SCIENCES

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