STUDIES ON PHOSPHORUS ENRICHED ORGANIC MANURES ON P-AVAILABILITY TO MAIZE - BENGAL GRAM CROPPING SEQUENCE IN VERTISOL
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Date
2001-08-09
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UNIVERSITY OF AGRICULTURAL SCIENCES, BANGALORE
Abstract
A field experiment was conducted at Main Research Station,
University of Agricultural Sciences, Dharwad on chromic haplusterts
during kharif and rabi of 1997-98 and 1998-99, to investigate the effect of
phosphorus enriched organic manures on soil properties and crop yield of
maize and their residual effect on bengal gram under irrigated condition.
The experiment consisted of three main plots: no P-fertilizcr, HRDF-P
(37.5 kg P205/ha) and 100% RDF-P (75 kg P205/ha) and 9 sub-plots: no
organic manure, FYM @ 5 t/ha, vermicompost @ 2 t/ha, biogas slurry @ 3
t/ha, poultry manure @ 2 t/ha, P-enriched FYM @ 2.5 t/ha, P-enriched
vermicompost @ 1 t/ha, P-enriched biogas slurry @ 1.5 t/ha and Penriched
poultry manure @ It/ha, with 3 replications in split plot design.
Application of P-enriched organic manures at all levels of Pfertilizers,
either individually or in combination significantly increased the
growth and yield of maize and bengal gram. The highest grain yields of
maize (59.80 q/ha) and bengal gram (24.30 q/ha) were obtained due to
addition of P-enriched poultry manure @ 1 t/ha plus 100 % RDF-P, which
were found superior to all other treatments. The increase in yield over
control (no organic manure) was 27.50 and 118.92 % in maize and bengal
gram, respectively.
Higher uptake of N, P, K and Zn by both the crops were observed
due to increased availability of these nutrients in soil with the addition of
P-enriched organic manures and P-fertilizer. Among different P-enriched
organic manures, poultry manure gave highest uptake and available
status of N, P, K and Zn. All the added P-enriched organic manures and
P-fertilizer in soil significantly decreased soil pH and increased EC and
organic carbon content.
In P-enriched organic manures at all levels of P-fertilizer, either
individually or in combination, significantly increased the transformation
of applied P into Al-P, Fe-P, Ca-P, Red-Sol-P, Occl-P, total mineral-P and
organic-P and similar trend was also noticed in residual effect on bengal
gram.
Addition of P-enriched poultry manure with HRDF-P found
beneficial and yielded higher monetary returns (Rs.49318.0/ha) and B:C
ratio (6.19) from maize-bengal gram cropping system.
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