Nutrient uptake by Kharif Rice and weeds as influenced by different establishment methods and weed management practices

A field experiment on rice entitled effect of different establishment methods and weed management practices on nutrient uptake by kharif rice and weeds was conducted at Agronomy Department Farm, Dr. BSKKV., Dapoli. Dist. Ratnagiri during Kharif (rainy) seasons 2016 and 2017. The research trial was laid out in a strip plot design comprising of twenty five treatment combinations replicated thrice. The horizontal strips comprised five rice establishment methods, viz. sowing of dry seeds by drum seeder at onset of monsoon, sowing of sprouted seeds (Rahu) by drum seeder on puddled field, broadcasting of sprouted seeds (Rahu) on puddled field, system of rice intensification (SRI) method and conventional transplanting. The vertical strips consisted five weed management practices, viz. need based two hand weedings at 20/30 and 40/60 DAS/DAT, pre-emergence application of oxadiargyl 80 WP @ 100 g ha-1+ 1 hand weeding at 20/30 DAS/DAT (W2), pre-emergence application of oxadiargyl 80 WP 100 g/ha + 1 hand weeding at 40/60 DAS/DAT, pre-emergence application of oxadiargyl 80 WP 100 g/ha + post emergence application of almix 20 WP 4 g/ha and unweeded control . The highest N, P and K uptake by kharif rice was obtained when rice crop was established by SRI method with two hand weedings carried out at 20 and 40 DAS as compared to remaining treatment combinations during both the seasons.