Abstract
A field study was conducted to assess the residual effect of cotton-mungbean intercropping on subsequent wheat crop. The treatments of the previous long-term experiment were cotton cultivar NIAB-78 alone, NIAB-78 intercropped with mungbean, Chandi alone, cotton CV. Chandi intercropped with mungbean, cotton CV. Sohni alone, Sohni intercropped with mungbean and cotton CV. AEHM74 alone, and AEHM-74 intercropped with mungbean. Each plot of the previous experiment was divided in three sub-plots for the application of nitrogen at 0, 60 and 120 kg N ha-1 . The maximum grain yield of 3.23 tons ha-1 recorded with 120 kg N ha-1 was significantly higher than 2.74 tons ha-1 and 1.13 tons ha-1 obtained from 60 kg N ha-1 and control treatments, respectively. The wheat grain yield of 1.19 tons ha-1 obtained from the plot previously intercropped by cv. Sohni and mungbean gave an increase of 3.5% over its sole cultivation. Highest N uptake of 47.9 kg ha-1 was recorded in the treatment where NIAB-78 and mungbean were previously intercropped and was 6% higher than its sole cultivation.
