Site-specific nutrient management using decision support tools in rice (Oryza sativa L.) – rice cropping system under sub-tropical environment
DOI:
https://doi.org/10.59797/ija.v70i4.278Keywords:
Decision Support Tool, Leaf-colour chart, Nutrient Expert, Rice, Site Specific Nutrient ManagementAbstract
The use of decision support tools (DST) for capturing the site-specific information is important for developing NPK recommendation. In order to understand performance of rice (Oryza sativa L.) under different fertilizer management practices based on DST under rice – rice cropping system, a researcher-managed trial (kharif 2019 to boro 2020-21) were conducted at Regional Research Sub-Station (NAZ), BCKV, Chakdaha, West Bengal. The experiment was laid out in a randomized complete block design with eight fertilizer management treatments and three replications. In both years, application of SSNMNE significantly increased all measured growth parameters and yield components of rice over other treatments in both kharif and boro season. The same treatment resulted in significantly higher seed and straw yield (16.67 and 2.42% more than the values in FFP plots, respectively in kharif season; 8.51 and 0.45% more than the values in FFP plots, respectively in boro season). System production efficiency was also highest with SSNMNE. Nutrient-limited yields were 1.62 and 2.3 t/ha for N, 0.62 and 1.9 t/ha for P, and 0.56 and 1.15 t/ha for K in kharif and boro season respectively, considering total rice yield (4.90 and 5.10 t/ha) obtained under SSNMNE as targeted yield. Indigenous nutrient supply of N, P and K were estimated as 65.3 and 84.3, 8.6 and 12.9, and 84.1 and 103.9 kg/ha in kharif and boro season respectively, that indicates higher K−supplying capacity of experimental soil as compared to N and P. Net return, B:C ratio and system economic efficiency was highest with SSNMNE, and finally proved the superiority of SSNMNE over other in augmenting productivity of rice – rice cropping system in lower Gangetic plains of West Bengal.
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