Effect of fertilizer application and weed management practices on nutrient uptake by summer blackgram (Phaseolus mungo) and associated weeds under rainfed condition

The results of the field experiment carried out during summer seasons of 1994 and 1995 at Kharagpur, revealed that N,P, K uptake by blackgram (Phaseolus mungo L.) and weeds were sinificantly higher under N20P50K30 levels of fertilizer than N10N25K15. Adoption of weed management practices significantly enhanced NPK uptake by blackgram and reduced removal of nutrients by weeds as compared to that of unweeded check, and saving of 29.1 to 52.3% N, 26.8 to 56.6% P and 16.9 to 54.3% K was achieved. Hand weeding and chemical weed control treatments gave higher grain yield of 0.73 and 0.62 t/ha respectively. The removal of nutrients by Digitaria sanguinalis, Enhydra fluctuans and Physalis minima were considerably high during both the years.