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Statistical Assessment of Sustainability of Finger Millet Yield through Rainfall and Soil Fertility Variables using Regression and Principal Component Models in Rainfed Semi-Arid Alfisol

Ramachandrappa, B. K., Sankar, G. R. Maruthi, Sathish, A., Dhanapal, G. N., Shankar, M. A., Raju, B. M. K., Sharma, K. L., Osman, M., Chary, G. Ravindra, Rao, Ch. Srinivasa, Nagarjuna Kumar, R.
Communications in soil science and plant analysis 2016 v.47 no.12 pp. 1476-1492
Alfisols, animal manures, cost benefit analysis, crop yield, field experimentation, models, nitrogen, phosphorus, potassium, rain, soil fertility, India
Field experiments were conducted in farmyard manure (FYM) and maize-residue (MR) blocks during 1984–2011 with the objective of identifying a superior treatment for attaining maximum finger millet yield and soil fertility at Bangalore. The treatments tested in the FYM block were Control; FYM@10tha ⁻¹; FYM@10tha ⁻¹ + 50% nitrogen, phosphorus, and potassium (NPK); FYM@10tha ⁻¹ + 100%NPK; 100%NPK; and in the MR block, Control; MR@5tha ⁻¹; MR@5t ha ⁻¹ + 50%NPK; MR@5tha ⁻¹ + 100%NPK; 100%NPK. FYM@10t/ha + 100%NPK gave a maximum mean yield of 3207 kg/ha in the FYM block, while MR@5t/ha + 100%NPK gave 2548 kg/ha in the MR block. Regression and principal component (PC) models of yield were developed through soil fertility and rainfall variables to assess the treatments. Maximum yield predictability of 60% and 65% under regression, and 76% and 75% under the PC model were observed for the FYM and MR blocks, respectively. FYM@10t/ha + 50%NPK was superior, with maximum gross returns of Rs.41286/ha and benefit–cost ratio (BCR) of 2.27 in the FYM block compared to MR@5t/ha + 100%NPK (gross returns of Rs.34530/ha and BCR of 2.09) in the MR block with maximum soil fertility, and are recommended for adoption under semi-arid Alfisols.