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Long-term fertilizer treatments may affects the available phosphorus status of soil. Therefore, a field experiment was conducted during 2021-22 under All India Coordinated Research Project on Long-Term Fertilizer Experiment (AICRP on LTFE) at Research Farm, Department of Soil Science and Agricultural Chemistry, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur (Madhya Pradesh) – India, to evaluate the availability of phosphorous in a Vertisol under soybean – wheat cropping system. The experiment was laid out in randomized block design with eight treatments comprising four replications. The treatments were performed in conjunction with different fertilizer doses, viz 50% NPK, 100% NPK, 150% NPK, 100% N, 100% NP, 100% NPK+FYM, 100% NPK-S and control. The results of the present study revealed that the application of 100% NPK+FYM treatment was found the yield of wheat (grain & straw) and available P status in soil, followed 150% NPK treatments. However, the lowest yield and available P status were observed in control plot, followed by 100% N alone treatment. The findings further revealed that the appreciable increase in available P status in soil in all the treatments except control and 100% N alone treatments. Thus, the balance dose of fertilizer applications, either alone or in combination with organic manure is required to sustainable crop production and augmenting soil fertility status.
Tekam et al. (Mon,) studied this question.