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AUTHOR(S): Gayatree Goswami, Debashish Baruah, Debahash Buragohain
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ABSTRACT A field experiment was conducted during autumn season at Assam Agricultural University, ICR Farm, Jorhat, Assam to compare three different direct seeded upland rice varieties under different integrated weed and nutrient management practices. The experiment was carried out in factorial randomized block design replicated thrice with 15 treatments involving 3 varieties; Inglongkiri, Maizubiron and Rasi adopting 5 treatments of weed and nutrient management, i.e. 20-10-10 kg/ha N-P2O5-K2O + pretilachlor @ 750 g/ha followed by grubber 30 DAS (W1), 30-15-15 kg/ha N-P2O5-K2O + pretilachlor @ 750 g/ha followed by grubber 30 DAS (W2), 10-5-5 kg/ha N-P2O5-K2O + pretilachlor @ 750 g/ha followed by grubber 30 DAS + Vermicompost @ 1 t/ha (at sowing & 30 DAS) + Sesbania (Sesbania aculeata) green mulch (up to 30 days) (W3), 10-5-5 kg/ha N-P2O5-K2O + pretilachlor @ 750 g/ha followed by grubber 30 DAS with intra-row spacing 15cm (W4), and 20-10-10 kg/ha N-P2O5-K2O + Weedy check (W5). The physico-chemical properties of soil at harvest were not significantly influenced by variety as well as weed and nutrient management practices. Application of 10-5-5 kg/ha N-P2O5-K2O, vermicompost @ 1t/ha, Sesbania green mulch, pretilachlor @ 750g a.i. /ha and grubber 30 DAS showed significantly higher soil microbial biomass carbon (323.72) at 30 DAS, significantly higher bacterial count at 75 DAS (23.07) and higher fungal count at 60 DAS (10.67), significantly higher NO3-N at 35, 55 and 70 DAS, and NH4-N at 15 DAS and 70 DAS. The results revealed an increase in yields as evident by higher grain and straw yield for all the three varieties was observed with pre-emergence application of pretilachlor (750 g a.i./ha) + grubber 30 days after sowing + 30-15-15 kg/ha N-P2O5-K2O. |
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KEYWORDS Direct seeded rice, variety, integrated weed and nutrient management, physico-chemical properties, NO3--N and NH4+-N content, microbial properties, yield |
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Cite this paper Gayatree Goswami, Debashish Baruah, Debahash Buragohain. (2023) Soil Properties and Yield of Direct Seeded Upland Autumn Rice (Oryza sativa) Varieties as influenced by Integrated Weed and Nutrient Management Practices. International Journal of Agricultural Science, 8, 224-237 |
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