EFFECT OF DIFFERENT MOISTURE REGIMES, LEVELS AND SOURCES OF PHOSPHORUS AND FYM ON THE AVAILABILITY OF NUTRIENTS IN THE SOIL OF WHEAT-GROWING AREA OF BHAL (GUJARAT)
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Date
1988
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AAU, Anand
Abstract
A laboratory incubation study was conducted during the year 1987, to evaluate the effect of different moisture regimes viz., 40, 30, 20, 10 and 40 (rewetting) per cent simulated due to depletion in moisture from flooded soil and again rewetting in presence (13.5 t/ha)/absence of FYM and different levels of P ( 0 , 4.87 and 9.74 ppm) applied through dicalcium phosphate and diammonium phosphate on the availability pattern of P, K, Fe, Mn, Zn, Cu and the changes in soil pH in a clay loam soil of wheat-growing area (Bhal). The study revealed that the value of soil PH was increased from 7.54 to 7.57, 7.51 and 7.65 when moisture depleted from 40 (M1) to 30 (M2) 20 (M3) and 10 (M4) per cent, respectively. Application of FYM markedly decreased the soil pH from 7.73 to 7.40. The availability of P and K in the soil was decreased significantly when the moisture was depleted from 40 to 10 per cent. Again on revetting the soil , availability of nutrients was restored. Application of diammonium phosphate at higher level significantly increased the availability of P in the soil over dicalcium phosphate. Application of FYM significantly increased the available P and K contents in the soil. The contents of DTPA-extractable Pe and Mn significantly decreased with depletion in inoisttire from 40 to 10 per cent, however, the reverse was true for Zn and Gu. Again on rewetting the soil , availability of nutrients was restored. Application of P at higher level significantly decreased the availability of Fe, Zn and Gu, while reverse was true for Mn. The magnitude of adverse effect of P on the avalbility of Fe, Zn and Gu was significantly reduced when it was applied through DAP over DCP, while the availability of Mn was significantly enhanced by DAP over DCP. The availability of Fe, Mn, Zn and Cu was significantly increased due to FYM application. The results of the present investigation clearly showed that at higher moisture level, application of FYM significantly enhanced the availability of different nutrients. DAP was observed a better source in increasing the Olsen's P and maintaining the micronutrients availability as compared to DCP, The pattern of nutrient availability also remained more or less same on rewetting the treated soil.
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Keywords
Agricultural Chemistry and Soil Science, A Study