Yendrembam Bebila Chanu, K Nandini Devi, Jamkhogin Lhungdim, A Herojit Singh, L Nabachandra Singh and N Gopimohan Singh

A field experiment entitled, “Studies on effect of integrated weed and nutrient management practices on the growth and yield of pre-kharif rice under rainfed condition” was conducted at the experiment was carried out at the Research Farm of College of Agriculture, Central Agriculture University, Imphal during two consecutive years i.e. pre-kharif of 2017-18 and 2018-19. The experiment was laid out in split plot design with replicated thrice. The treatments comprised with five weed management practices in the main plot viz., (W1) pre-emergence Pyrazosulfuron ethyl 10% W.P. @ 0.025 kg a.i haˉ¹, (W2) post-emergence Bispyribac-sodium 10SC 9.5% w/w @ 0.025 kg a.i haˉ¹, (W3) pre-emergence Pyrazosulfuron ethyl 10% W.P. @ 0.025 kg a.i haˉ¹ + post-emergence Bispyribac-sodium 10SC 9.5% w/w @ 0.025 kg a.i haˉ¹, (W4) 2 Hand weeding at 25 & 45 DAS and (W5) Weedy check and four nutrient management in the sub plot viz., (N1) 100% RDF Nitrogen as urea, (N2) 75% RDF Nitrogen as urea + 25% RDF Nitrogen as Loktak phumdi compost, (N3) 50% RDF Nitrogen as urea + 50% RDF Nitrogen as Loktak phumdi compost and (N4) 100% RDF Nitrogen as Loktak phumdi compost. The pooled data revealed that all the weed management practices, application of pre-emergence (Pyrazosulfuron ethyl 10% W.P. @ 0.025 kg a.i/ha) at 5 DAS + post-emergence (Bispyribac-sodium 10SC 9.5% w/w @ 0.025 kg a.i/ha) at 20 DAS (W3) gave the highest plant growth attributes like plant height, number of tillers m-2, plant population and leaf area index at all the growth stages of pre-kharif rice and highest grain and straw yield. Among the nutrient management practices, highest yield attributes was observed in the application of 75% RDF nitrogen as urea + 25% RDF nitrogen as loktak phumdi compost (N2). The interaction between the integrated weed and nutrient management practices had significantly effect on the growth and yield attributes.

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