Impact of Long-term Use of Fertilizers and Manure on Distribution of Soil-inorganic Phosphorus Fractions in a Vertisol
Anil Muniya
Department of Soil Science and Agricultural Chemistry, College of Agriculture, JNKVV, Jabalpur, Madhya Pradesh (482004), India.
B. K. Dixit
Department of Soil Science and Agricultural Chemistry, College of Agriculture, JNKVV, Jabalpur, Madhya Pradesh (482004), India.
P. N. Tripath
Krishi Vigyan Kendra, Panna, Madhya Pradesh (488001), India.
Vikas Gupta
Department of Agronomy, College of Agriculture, JNKVV, Jabalpur, Madhya Pradesh (482004), India.
Yagini Tekam *
Department of Soil Science and Agricultural Chemistry, College of Agriculture, JNKVV, Jabalpur, Madhya Pradesh (482004), India.
Aruna Meravi
Department of Soil Science and Agricultural Chemistry, College of Agriculture, JNKVV, Jabalpur, Madhya Pradesh (482004), India.
Jamu Singh Damor
Department of Soil Science and Agricultural Chemistry, College of Agriculture, JNKVV, Jabalpur, Madhya Pradesh (482004), India.
*Author to whom correspondence should be addressed.
Abstract
The field experiment was conducted during the kharif season under the AICRP on Long-Term Fertilizer Experiment at the Research Farm, Department of Soil Science and Agricultural Chemistry, JNKVV, Jabalpur (M.P.), India. The investigation was carried out to assess the distribution of P fractions in Vertisol after the harvesting of the soybean crop. Eight treatments were imposed with four replications in a simple randomized block design. The treatments were applied in combination with different doses of fertilizer viz., T1 (50% NPK), T2 (100% NPK), T3 (150% NPK), T4 (100% N), T5 (100% NP), T6 (100% NPK+FYM), T7 (100% NPK-S), and T8 (control). Through the findings, the soil pH and electrical conductivity (dS m-1) did not show significant changes even after the long-term application of various fertilizer levels compared to their initial values. The treatment with 100% NPK + FYM exhibited the highest organic carbon (g kg-1) content and available N, P, and K (kg ha-1) content over the control. The various forms of phosphorus in the soil were observed in the following order: Ca-P > Fe-P > Al-P > Occluded-P > Saloid-P . The Ca-P content was highest when 100% NPK fertilizer and farmyard manure (FYM) were used together. The analysis showed that the presence of saloid-P significantly influences the availability of phosphorus in Vertisol soil. Based on the current investigation, it is recommended to use integrated nutrient management, which includes both 100% NPK fertilizer and FYM, to prevent phosphorus deficiency in soybean cultivation in Vertisol.
Keywords: FYM, LTFE, inorganic fertilizer, phosphorus fraction, vertisol