Effect of Brown Manuring on Performance of Rice Bean in Aerobic Rice – Rice Bean Cropping System

Author: Jyoti Jadipujari, Lalitha, B.S., H.M. Jayadeva, Anand, S.R. and G.G. Kadalli

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Abstract

The decline in soil fertility resulting from intensive chemical use in modern farming underscores the critical need for sustainable methods like brown manuring. The field experiment was conducted at Agronomy field unit, ZARS, UASB, GKVK, Bengaluru during summer and kharif seasons of 2022 and 2023 to study effect of brown manuring on performance of rice bean in aerobic rice – rice bean cropping system. The experiment was composed of three factors viz., factor I: Brown manuring (C1-Rice and C2-Rice + Sunhemp), factor II: RDF levels (N1 - 75% RDF, N2 - 100% RDF and N3 - 125% RDF) and factor III: Herbicides [H1 - No herbicide, H2 - Pendimethalin (1000 g a.i. ha-1) PE fb Pyrazosulfuron (25 g a.i. ha-1) (POE at 25 DAS) and H3 - Bensulfuron methyl + Pretilachlor 6.6 % G (660 g a.i. ha-1) PE fb Bispyribac sodium (25 g a.i. ha-1) 25-30 DAS] with total of 18 treatment combinations replicated thrice and laid out in RCBD design with Factorial concept. Rice + sunhemp recorded higher plant height (42.99 cm), dry matter production (25.52 g plant-1), number of pods (44.02plant-1), grain yield (1241 kg ha-1) and haulm yield (2811 kg ha-1). Among different RDF levels, 125% RDF recorded higher plant height (41.96 cm), dry matter production (24.91 g plant-1), number of pods (42.97 plant-1), grain yield (1211 kg ha-1) and haulm yield (2753 kg ha-1). Pre-emergent application of bensulfuron methyl + pretilachlor 6.6 % G (660 g a.i.ha-1) fb bispyribac sodium (25 g a.i.ha-1 at 25-30 DAS) noticed higher plant height (41.50 cm), dry matter production (24.64 g plant-1), number of pods (42.50 plant-1), grain yield (1198 kg ha-1) and haulm yield (2727kg ha-1). Combination of rice + sunhemp with 125% RDF along with application of bensulfuron methyl + pretilachlor 6.6 % G (660 g a.i.ha-1) fb bispyribac sodium (25 g a.i.ha-1 at 25-30 DAS) recorded higher plant height (44.45 cm), dry matter production (26.39g plant-1), number of pods (45.52 plant-1) grain yield (1283 kg ha-1) and haulm yield (2893 kg ha-1).

Keywords

Brown manuring, Herbicides, Rice bean and yield.

Conclusion

Practice of brown manuring (Rice+Sunhemp) in aerobic rice has increased the yield of residual rice bean (12.8 %) grown after rice due to its beneficial effects on soil health and improved nutrient availability to subsequent crops. Application of 125% RDF in rice increased the growth and yield of residual crop. Pre-emergent application of bensulfuron methyl + pretilachlor 6.6 % G (660 g a.i.ha-1) fb bispyribac sodium (25 g a.i.ha-1 at 25-30 DAS) had beneficial effect on residual rice bean crop in terms of increasing growth and yield by reducing the weed flora in residual crop. Farmers can use brown manuring technology due to its multiple benefits viz., reducing weed competition in present crop (rice) and ample supply of nutrients to residual crops (rice bean)like pulses and oil seeds due to its higher nutrient availability in soil after its decomposition, along with this it also improves the physico-chemical and biological properties of soil which reduce the nutrient losses. It also reduces the chemical load (fertilizers and herbicides) to soil. This sustainable practice can help to increase yields, reduce environmental impact and ensure food security in an eco-friendly manner.

References

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How to cite this article

Jyoti Jadipujari, Lalitha, B.S., H.M. Jayadeva, Anand, S.R. and G.G. Kadalli (2023). Effect of Brown Manuring on Performance of Rice Bean in Aerobic Rice – Rice Bean Cropping System. Biological Forum – An International Journal, 15(10): 514-520.