volume 47 issue 1 (february 2013) : 59-65
PHOSPHATE FRACTIONS AS INFLUENCED BY LONG-TERM PHOSPHORUS FERTILIZATION
1Department of Soil Science,
CCS Haryana Agricultural University, Hisar-125 004, India
ABSTRACT
A long-term field experiment on pearl millet-wheat cropping sequence initiated during rabi 1968 using split plot design was selected for present investigation at Soil Research Farm, CCSHAU, Hisar, Haryana. There were eleven treatment combinations related to sources (rock phosphate, nitrophosphate, SSP, DAP and UAP) and levels of P (60 and 120 kg P2O5 ha-1), including one control which were in main plots and three modes of P application were in sub-plots. Continuous application of different phosphatic fertilizers increased Olsen’s available P in soil. The maximum increase of available P was found with DAP (18.0 ppm) and minimum with RP (6.7 ppm). The available P content of the soil in control plot decreased from its original level of 6.6 ppm to 2.7 ppm. Inorganic P fractions revealed that Ca-P was the dominant fraction (78.7%) followed by Al-P (10.1%), Fe-P (7.9%) and saloid-P (3.3%). Increasing levels of P application increased significantly saloid-P, Al-P, Fe-P and Ca-P over lower levels of P application. Saloid-P, Al-P and Fe-P fractions were highly inter-related and they all were significantly correlated with Olsen’s available P in soil.
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Indian Journal of Agricultural Research
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