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Interpretive Summaries:
2003 - Site-Specific Nutrient Management for Maximizing Crop Yields in the Inceptisols and Vertisols of Chhattisgarh
2002 - Site-Specific Nutrient Management for Maximizing Crop Yields in the Inceptisols and Vertisols of Chhattisgarh
2001- Site-specific nutrient managment for maximizing crop yields in soils of Chhattisgarh
Site-Specific Nutrient Management for Maximizing Crop Yields in the Inceptisols and Vertisols of Chhattisgarh, 2003
Chhattisgarh is one of the major rice growing states in India, but imbalanced and inadequate nutrient use has stagnated productivity at 1.2 to 1.5 t/ha. This situation provides good opportunity for establishing a site-specific nutrient management (SSNM) program. The state’s four major soil groups (Entisols, Inceptisols, Alfisols, and Vertisols) have proven nitrogen (N) and phosphorus (P) deficiencies. Potassium (K) status is traditionally considered medium to high in the region. On-farm trials were established with the objective to improve yields and farmers profit within the state. Four sites were selected within Inceptisol and Vertisols. Based on the soil test results, optimum doses of the deficient nutrients were determined and applied. These SSNM treatments were compared to farmer practice (FP) of 60-40-0 kg N-P2O5-K2O/ha (rice) and 80-50-30 kg/ha (wheat) as well as a generalized state recommendation (SR) of 80-50-30 kg/ha (rice and wheat).
Average rice yield under SSNM was 6.75 t/ha for the Inceptisols and 7.02 t/ha for the Vertisols, compared to 5.57 and 5.5 t/ha under the generalized SR. Average grain yield under the SR was 16% higher than FP in Inceptisol sites and was 21% higher in Vertisol sites. However, SSNM produced 40% more yield than FP in Inceptisols and 55% more yield in Vertisols. Average wheat yield under FP was 79% and 76% lower than SSNM, and SR yields were 44% and 49% lower than SSNM, for Inceptisol and Vertisol sites, respectively.
Both soil-types had highest net returns under SSNM which excluded secondary and micronutrients. Highest net returns for rice were US$488/ha (Inceptisols) and US$468/ha (Vertisols), which were US$82/ha and US$107/ha higher than the SR and US$174/ha and US$224/ha higher than FP. In wheat, SSNM (also excluding secondary and micronutrients) proved most profitable at US$468/ha and US$466/ha in Inceptisol and Vertisol sites, respectively, which were US$93/ha and US$86/ha higher than the SR and US$161/ha and US$138/ha higher than FP. It should be noted that SSNM treatments that include secondary and micronutrients may fetch highest net returns if their residual effects were considered.
It is clear that recommendations for nutrient application need revision if maximum economic yield is desired. NWZ India-54
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