Study on Enzyme Activities and Nutrient Availability in Calcareous Soil as Influence by Phytase and FYM Levels under Soybean Cultivation

Abstract

Study on Enzyme Activities and Nutrient Availability in Calcareous Soil as Influence by Phytase and FYM Levels under Soybean Cultivation” was conducted during Kharif 2016 at Division of Soil Science, College of Agriculture, Pune. The treatment consisted of four levels of each phytase (0, 1200, 2400 and 3600 IU) and FYM (0, 2.5, 5, 7.5 t ha-1) replicated thrice in factorial randomized block design. Enzyme activities and nutrient availability in soil was assessed and 50 % flowering and harvest of soybean. Application of phytase @ 3600 IU or 7.5 t ha-1 FYM recorded significantly higher acid phosphatase, alkaline phosphatase and dehydrogenase activity at 50 % flowering and harvest of soybean. Significant increase in soil available phosphorus in calcareous soil at both the growth stages of soybean over initial was observed with the application of phytase and FYM in all the treatments. Application of 3600 IU phytase and 7.5 t ha-1 FYM recorded higher soil available nitrogen (245.65 and 180.08 kg ha-1) and phosphorus (16.08 and 13.34 kg ha-1) at 50 % flowering and at harvest. However, phytase application @ 2400 IU (252.62 and 243.36 kg ha-1) and FYM application either @ 7.5 or 5 t ha-1 (253.96 and 239.72 kg ha-1) were found effective for soil available potassium at both growth stages. Application of phytase @ 3600 IU recorded reduction magnitude from 13.31 to 12.43 % at 50 % flowering and from 12.29 to 10.93 % at harvest was obtained with the amendment of phytase. Similar trend was also recorded for 7.5 t ha-1 FYM. The magnitude of reduction in CaCO3 content was noticed very less in no phytase and no FYM at 50% flowering 14.06 per cent and at harvest 12.60 per cent.