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Nutrient uptake and yield of soybean (Glycine max L.) as influenced by pre and post-emergence herbicides

Sylvestre Habimana, K. N. Kalyana Murthy, B. C. Shankaralingappa, M. T. Sanjay and C. Ramachandra

A field experiment was conducted in zonal agricultural research station, University of agricultural sciences, (UAS) GKVK Bengaluru during Kharif, 2012 to study the nutrient uptake and yield of soybean as influenced by Pre and Post-emergence herbicides. The experiment was laid out in Randomized Complete Block Design (RCBD) with ten treatments replicated thrice. The treatments constituted of application of pre and post-emergence herbicides (pendimethalin 30 EC, metribuzin 70 WP and fenoxaprop–p-ethyl 9 EC, imazethapyr 10 SC, respectively), farmer’s practice of intercultivation fb hand weeding at 20 and 40 DAS as well as unweeded check. The study revealed that intercultivation fb.hand weeding at 20 and 40 DAS recorded significantly higher plant height and dry matter production of crop and thus resulted in higher uptake of nutrients (N, P and K) by the soybean as well as higher grain yield over other herbicide treatments and unweeded check except pre-emergence application of metribuzin 70 WP fb. imazethapyr and metribuzin 70 WP fb.intercultivation at 30 DAS which remained at par each other.