Form of P And S in Acid Soil With Continuous Cropping And Fertilizer Use
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Date
1996
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Birsa Agricultural University, Ranchi
Abstract
It is well recognised that the continuous use of chemical fertilizers and manures bring about changes in primary and secondary nutrient status of the soil and their physico-chemical properties. These manures & fertilizers along with the intensive cropping are expected to effect the equilibiria involving phosphorus & sulphur fractions in soil plant system. The information’s available on this subject is scanty. Keeping this in view an investigation entitled "Forms of P and S in acid soil with continuous cropping and fertilizer use". was under taken. Analysis for some physico chemical properties, total-P, total-S, available P and S content in soil and plant samples from different treatments of Long term fertilization experiment (ICAR), continuing from 1972-73 in Ranchi Agril. College, Kanke, Ranchi (Bihar), were undertaken after the harvest of Rabi crop (wheat) of the year 1994-95.
Ph. and organic carbon status of soils decreased, in general, from its initial value, except treatments receiving lime and FYM. Concentration of NPK increased with increasing doses of fertilizers and with F.Y.M. both in soils and plants.
The highest yield of wheat was recorded where 100% NPK fertilizers were applied with F.Y.M. which was followed by 100% NPK+Lime.
The yield increased when the dose of fertilizer was increased from 50 to 100 percent of NPK, but there was no significant, increase in yield when the dose of fertilizers was increased from 100 to 150% of NPK. The lowest yield was recorded where only nitrogenous fertilizer was applied which was even lower then control where no any fertilizer was applied."
The uptake of P and S was highest in 100 percent NPK+FYM+W followed by 100 percent NPK+Lime+W treated plots and the lowest in 100 percent N+W treated plots. The total P status increased in all the treatments exhibiting a -cumulative effect of P depending upon the level of its application. Maximum P was observed with FYM with 100% NPK level showing the impacts of organic matter.
Different forms of P exhibited the decreasing sequence of Fe PAI-P, Ca-P, Occluded-P, solid-P, in general with the exception of lime treatment where Ca-P dominated.
The total S was maximum in 100% NPK+FYM+W treated plot followed by 100% N(S) +PK+W treated plots and minimum in control plot and maximum available sulphur was recorded in sulphur applied plot ic, 100% N(S)+PK+W plots, followed by Lime treated plot ie, 100% NPK+Lime+W and minimum available Sulphur was recorded in control plot.
Different forms of S exhibited decreasing sequence of or ganic-S, adsorbed-S. Minimum organic-S was recorded in 100% NPK+FYM+W treated plot ie, 97.63 percent of total-S, followed by sulphur applied plots 100% N(S)+PK+Wic, 96.25 percent of total-S and very less was observed in control plot ic 88.56 percent of total-S.