LONG-TERM INFLUENCE OF INTEGRATED NUTRIENT MANAGEMENT ON SOIL FERTILITY CHANGES AND TOTAL UPTAKE UNDER RICE-RICE CROPPING SYSTEM
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Authors
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P.V. GEETHA SIREESHA*, G. PADMAJA and P.C. RAO
Dept. of Soil Science and Agricultural Chemistry, College of Agriculture, Professor Jayashankar Telangana State Agricultural University, Rajendranagar, Hyderabad -500 030
Abstract
A long-term field experiment was initiated during Kharif, 1989 to study the effect of the combination of organic
and inorganic fertilizers on yield, fertility status and uptake pattern of nutrients in rice-rice cropping system. The
results pertaining to 2013-14 were presented in this article. The pH values of 1:2.5 soil-water suspensions ranged
from 5.3 to 5.9 after harvest of Kharif and Rabi rice, indicating moderately acidic to slightly acidic in reaction.EC
decreased slightly from the initial (1.09 dSm-1) and ranged from 0.78 dSm-1 to 0.95 dSm-1 indicating non-saline
nature. The highest organic carbon content (1.70% and 1.88%, respectively) was noticed in the treatment receiving
50% RD of NPK + 50% N through FYM in Kharif and Rabi. Application of FYM along with 100% NPK produced
significantly higher yields under both Kharif (7402 kg ha-1) and Rabi (7267 kg ha-1) than the application of 100% NPK
(7075 and 7150 kg ha-1) and FYM (5777 kg ha-1 and 4533 kg ha-1) alone treated plots. Nutrient uptake (kg ha-1) of straw
under Kharifindicated that nitrogen, phosphorus and potassium uptake was higher in T4 with uptake values of 93.5
kg ha-1, 44.9 kg ha-1 and 184.2 kg ha-1, respectively. Application of 100% RD of NPK + FYM @ 5 t ha-1 was effective in
increasing grain and straw yield of rice.
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