Modeling of Interactive Effects of Rainfall, Evaporation, Soil Temperature, and Soil Fertility for Sustainable Productivity of Sorghum + Cowpea and Cotton + Black Gram Intercrops under Rotation Trials in a Rain-Fed Semi-arid Vertisol

Soil-Plant-Fertilizer Relationships in Turmeric Assessment of Soil-Plant-Fertilizer-Nutrient Relationships for Sustainable Productivity of Turmeric under Alfisols and Inceptisols in Southern India

“…The authors also observed that if the fertilizer is judiciously applied based on soil fertility of nutrients, maximum sustainable yields could be achieved under any soil and agroclimatic condition. The long-term effects of fertilizer on yield and soil properties were examined to suitably restore the soil fertility and calibrate the soil test based fertilizer doses for different crops (Prasad and Goswami 1992;Bhat, Beri, and Sindhu 1991;Dalal and Mayer 1986;Mathur 1997;Maruthi Sankar et al 2012b). Although many authors have studied on the fertilizer effects on crop productivity, the information pertaining to efficiency of fertilizer nutrients for attaining sustainable crop productivity apart from the maintenance of maximum soil fertility using more confirmed long-term data is very scanty.…”

“…Such a dimensionality reduction would be an important economic consideration, especially if potential information recoverable from the transformed data is just as good as original data (Anderson and Furley 1975). The long-term sustainability of treatments could be assessed based on the procedure described by Maruthi Sankar et al (2011, 2012a, 2012b. Considering these facts, the present study has been conducted (i) to monitor the effects of fertilizer treatments on rhizome and dry-matter yield of turmeric as well as soil and plant nitrogen (N), phosphorus (P), and potassium (K) nutrients; and (ii) to establish relationships among crop yield, soil, and plant N, P, and K nutrients and assess variability in data using regression and principal component models.…”

Efficient Tillage and Nutrient Management Practices for Sustainable Yields, Profitability and Energy Use Efficiency for Rice-Based Cropping System in Different Soils and Agro-Climatic Conditions

“…In order to compute the profitability of tillage and fertilizer treatments over years, the gross and net returns and benefit-cost (BC) ratio were calculated (Maruthi Sankar et al ., 2012; Nema et al ., 2008). The gross returns (Rs ha −1 ) were computed as a product of mean yield of each treatment over years and value of the crop at each location.…”

Modeling of Soil-Plant-Fertilizer Relationships for Optimizing Fertilizer Doses for Different Levels of Finger Millet Yield under Semi-Arid Alfisols

“…The authors also observed that if the fertilizer was judiciously applied based on the soil fertility status of nutrients, maximum sustainable yields could be attained under any soil and agro-climatic condition. The long-term effects of fertilizer on yield of crops and soil physical and chemical properties were examined to suitably restore the soil fertility and calibrate the soil test-based fertilizer doses for different crops (Bhat, Beri, and Sindhu 1991;Dalal and Mayer 1986;Maruthi Sankar et al 2012b;Mathur 1997;Prasad and Goswami 1992). Although many authors have studied the effects of fertilizer on crop productivity, the information pertaining to efficiency of soil and fertilizer nutrients for attaining sustainable targeted yield of crops apart from the maintenance of maximum soil fertility using more confirmed long-term data is very scanty.…”

“…A regression model is also useful for assessing the efficiency of fertilizer treatments and identifying a superior treatment for attaining sustainable yield of a crop, apart from calibrating soil test-based optimum fertilizer doses for different crops under low, medium and high soil fertility conditions. The long-term sustainability of fertilizer treatments could be assessed based on the procedure described by Maruthi Sankar et al (2011, 2012a, 2012b. Considering the above facts, the present study was conducted to monitor the effect of fertilizer treatments on (i) grain yield (GY) of finger millet; soil fertility and plant uptake of nitrogen (N), phosphorus (P) and potassium (K) nutrients and (ii) examine the relationship of crop yield with soil and plant nutrients and assess their variability for developing regression models for the prediction of yield and optimization of soil test-based fertilizer doses.…”