Impact of long-term application of inorganic fertilizers and organic manure on wheat yield and available phosphorous contents in a vertisol under soybean-wheat cropping sequence

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.