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International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad treatments in cotton-based intercropping systems. The nutrient management consists of INM (M1) comprising 75% RDF + compensation through NPS compost, Organic (M2) comprising 100% NPK dose through NPS compost, and cotton-based intercropping systems i.e. Only cotton (S1), cotton + dhaincha (S2), cotton + sunhemp (S3), cotton + greengram (S4), cotton + blackgram (S5). The soil is slightly alkaline in reaction (pH 7.76), low in available nitrogen (195.17 kg N ha -1 ), low in available phosphorus (12.90 kg p ha -1 ), very high in available potash (368.42 kg K ha -1 ) and has 8.27 mg kg -1 available sulphur and 0.52 mg kg -1 DTPA extractable zinc. Results The significantly higher organic carbon (6.12 g kg -1 ) was observed with the application of 100% nutrients through nitrophosphosulpho (NPS) compost only as compared to nutrients supplied through integrated nutrient management (5.80 g kg -1 ) i.e. 75% RDF + 25% compensation through NPS compost as shown in the table. While, under cotton-based intercropping systems, cotton + dhaincha (1:1) recorded significantly highest organic carbon (6.43 g kg -1 ) followed by cotton + sunhemp (1:1) (6.18 g kg -1 ) which was found on par with each other. The lowest organic carbon (5.47 g kg -1 ) was noticed under sole cotton treatment. The residual soil fertility status in respect of available nitrogen (235 kg ha -1 ), phosphorus (21.80 kg ha -1 ), potassium (412 kg ha -1 ), and sulphur (12.73 mg kg -1 ) was increased significantly due to the application of 75 % RDF + 25% compensation through NPS compost as compared to the application of 100% NPK dose through NPS compost (organic only) under nutrient management. Under the treatments of cotton-based intercropping systems, the significantly higher value of available N (242 kg ha -1 ), P (23.70 kg ha -1 ), K (418 kg ha -1 ), and S (13.30 mg kg -1 ) was recorded in the intercropping of cotton + dhaincha (1:1) which was at par with the intercropping of cotton + sunhemp (1:1). The lowest available nitrogen, phosphorus, potassium and sulphur status was recorded in the treatment of sole cotton only. The nutrient management and cotton-based intercropping system interaction effect was found to be non-significant. Under the nutrient management, the significantly higher soil microbial biomass carbon (210.41 mg kg -1 ), dehydrogenase activity (46.01 µg g -1 24 hr -1 ) and CO2 evolution (47.59 mg 100 -1 g soil) were recorded in the treatment receiving 100% RDF through NPS compost as compared to the nutrients supplied through 75 % RDF + 25% compensation through NPS compost. The significantly highest SMBC (217.43 mg kg -1 ), dehydrogenase activity (48.91 µg g -1 24 hr -1 ) and CO2 evolution (52.27 mg 100 -1 g soil) was observed in the intercropping treatment of cotton + dhaincha (1:1) followed by intercropping of cotton + sunhemp (1:1) which were on par with each other. The lowest biological properties were recorded in sole cotton. 677 | Page Resource conservation and rainfed agriculture
International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad A Conclusion Hence, it can be concluded that integrated nutrient management (75 % RDF + Compen. through NPS compost) and intercropping of cotton with dhaincha (1:1) were found superior in sustaining the cotton productivity and improving chemical and biological properties of Vertisol under rainfed conditions in Vidarbha region of central India. References Doran, J.W., D.G. Fraser, M.N. Culik and W.C. Liebhardt, 1988. Influence of alternative and conventional agricultural management on soil microbial process and nitrogen. American Journal of Alternative Agriculture 2 (3): 99-106. Swarup, Anand (2010). Integrated plant nutrient supply and management strategies for enhancing soil quality, input use efficiency and crop productivity. J. Indian Soc. Soil Sci. 58:25-31. Effect of conjoint use of organic and inorganic sources on rainfed cotton productivity and chemical and biological properties of Vertisols Treatments Main Plot (Nutrient Management) M1 INM (75 % RDF + 25% compensation through NPS compost) M2 Organic (100 % RDF through Nitrophosphosulpho compost) SE (m) Cotton yield (q ha –1 ) Seed cotton Cotton stalk OC Available Nutrients (kg ha -1 ) Avail. Sulphur (g kg -1 ) N P K (mg kg -1 ) SMBC (mg kg - 1 ) Biological properties DHA (µg g -1 24 hr -1 ) CO2 evolution (mg 100 -1 g soil) 14.09 28.01 5.80 235 21.80 412 12.73 202.04 36.33 41.80 12.35 24.48 6.12 228 20.50 404 12.36 210.41 46.01 47.59 0.11 0.20 0.057 1.53 0.29 1.8 0 0.04 1.59 0.84 0.90 CD at 5 % 0.33 0.58 0.169 4.53 0.86 5.34 0.11 4.73 2.49 2.66 B. Sub plot (Cotton based intercropping systems) S1 S2 S3 Control (only cotton) 12.39 Cotton + Dhaincha (1:1) 14.30 Cotton + Sunhemp (1:1) 13.89 24.00 5.47 222 18.50 395 11.70 193.41 32.89 37.76 28.91 6.43 242 23.70 418 13.30 217.43 48.91 52.27 27.97 6.18 237 22.66 415 13.17 213.10 44.43 49.51 678 | Page Resource conservation and rainfed agriculture
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Extended Summaries 22-24 December,
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Citation Rama Rao, C.A., Srinivasa
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Resilience through land and water m
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International Conference on Reimagi
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Theme- 2 Ecosystem based approaches
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