Author(s):

MK Bhatt, KP Raverkar, Rini Labanya and Chetan Kr. Bhatt

Abstract: To examine the effect of long-term balanced and imbalanced use of inorganic fertilizers and FYM on chemical properties of soil, a field experiment with rice at the Crop Research Centre, Department of Agronomy, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, under a rice–wheat system was conducted. The experiment comprised 14 treatment combinations viz., N, P and K fertilizer application as individual component and use of chemical fertilizers in conjunction with farm yard manure. The experimental treatments were replicated four times. Combined application of inorganic fertilizer and FYM resulted in a positive influx of nutrients by increasing soil pH, electrical conductivity, cation exchange capacity, organic carbon content, available nitrogen, available phosphorus, available potassium and yield of rice in both the surface and sub-surface layer of soil. Lowest physico-chemical properties were recorded in control in both the surface and sub-surface layer while, the highest were recorded due to combined application of inorganic fertilizer along with organic manure. The highest EC (0.34 and 0.33 dsm^-1) was recorded under N₁₂₀+P₄₀+K₄₀+FYM while, the highest CEC (36.40 and 28.50 Cmol (p+) kg^-1), organic carbon (1.24 and 0.81 %), available N (293.20 and 1189.54 kg ha^-1), and P (29.35 and 12.18 kg ha^-1) was recorded due to N₁₈₀+P₈₀+K₄₀+Zn(F)+FYM. The highest available K (225.81 and 110.73 kg ha^-1) was recorded due to N₁₂₀+P₄₀+K₄₀+FYM. The lowest yields (grain, straw, and biological) were recorded in control while, the highest crop yields were recorded under N₁₈₀+P₈₀+K₄₀+Zn(F)+FYM. The present investigation clearly points out the significance of balanced and imbalanced use of nutrients including FYM in rice-wheat cropping system for improving the various physico-chemical soil quality indices and yield of rice crop over a long period.

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