LONG-TERM EFFECT OF FYM AND NITROGEN ON THE DISTRIBUTION OF K FRACTION IN SOIL UNDER PEARL MILLET-WHEAT CROPPING SYSTEM
ROHTAS KUMAR AND R. P. NARWAL
Department of Soil Science
CCS Haryana Agricultural University,
Hisar-125004 (Haryana), India
*(e-mail : rkmsoil@gmail.com)
(Received : 11 August 2016; Accepted : 26 September 2016)

SUMMARY

The present study evaluated the effect of farmyard manure and fertilizer-N doses on distribution of different K fractions in a long-term field experiment. The long-term field experiment was conducted since 1967 in Department of Soil Science on a coarse loamy, Typic Ustochrept soil using a pearl millet-wheat cropping sequence. Total-K content of soil increased with the application of FYM. Water soluble-K, exchangeable-K, non exchangeable-K and lattice-K were ranged from 35-77 mg/kg, 155-1117 mg/kg, 2215-4346 mg/kg and 11076-15407 mg/kg, respectively in surface soil. The water soluble-K, exchangeable-K, non exchangeable-K and lattice-K were higher in surface soil. Farmyard manure applied in rabi season had more effects as compared to kharif season. Application of fertilizer-N had deleterious effect on all K fractions. The percent contribution of different K fractions towards total K in surface and sub-surface soil followed the order: water soluble-K < exchangeable-K < non exchangeable-K < Lattice-K.

Key words: Fertilizer-N, FYM, long-term, pearl millet, potassium fractions and wheat

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