Productivity and nutrient use efficiency of soybean (Glycine max) and sorghum (Sorghum bicolor) intercropping at different levels of nitrogen in rainfed deep vertisols
2004
Ramesh, P. | Reddy, K.S., Indian Institute of Soil Science, Bhopal (India)
A field experiment was conducted during the rainy season of 2000 and 2001 on deep Vertisols of Bhopal, to study the effect of soybean [Glycine max (L.) Merr.] and sorghum [Sorghum bicolor (L.) Moench] intercropping (2:1 row ratio) in comparison to their sole crops at 3 levels of nitrogen (0, 75 and 100 percent recommended dose). Sole sorghum recorded higher seed, straw and soybean-equivalent yield (SEY) compared to either sole soybean or soybean + sorghum intercropping. However at No' soybean + sorghum intercropping resulted in higher SEY and at higher N status (75 or 100 percent), sole sorghum resulted in higher SEY. Nitrogen-uptakeiNas higher in sole soybean, whereas P and K uptake were higher in sole sorghum. Sole sorghum recorded higher nutrientuse efficiency (NUE), whereas sole soybean resulted in iower NUE. However, nutrient harvest index of NPK were higher in sole soybean and lowest in sole sorghum. Increased N levels significantly improved the SEY, nutrient uptake and agronomic and recovery efficiency of NPK. However, physiological efficiency and nutrient harvest index of NPK were not affected due to increased N levels.
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