Effect of tillage practices and P fertilization on soil inorganic P fractions, yield and nutrient uptake by wheat
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Date
2015
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
Limited information is available on the impact of tillage and P fertilization on soil inorganic P
fractions and crop yield. The study was conducted in rabi season of 2013-14 and an ongoing
experiment on “Phosphorus management in wheat under different tillage practices in sequence with
sorghum crop” initiated in 2011 at Soil Research Farm, Hisar was selected. Experiment was laid out in
a split plot design with four replications. Three tillage treatments in main plots [(Zero tillage-ZT
(Glyphosate @ 3 l ha
-1
used as preplant desiccator at 10-15 days before sowing); conventional tillageCT (two cultivator + two tractor drawn harrowing followed by planking); and minimum tillage-MT
(one cultivator + one tractor drawn harrowing followed by planking)] and four P treatments in subplots (0, 45, 60 and 75 kg ha
-1
) were applied in wheat. On these plots, sorghum was raised for fodder
in kharif as per other package of practices. The results revealed that after three years, under tillage
treatments poor improvement in soil chemical or physical properties is because of poor organic C build
up in soils. For soil P fractions, results showed insignificant affect of tillage systems on inorganic soil P
fractions except Saloid-P in surface, which significantly increased in ZT. Increasing levels of P
application significantly increased all the inorganic soil P fractions over control and lower P levels. All
inorganic P fractions were higher in the surface as compared to subsurface soil under various
treatments and distribution in different fractions followed the sequence: Ca-P > Fe-P > Al-P > Saloid-P
at both the depths. Calcium-P represented on an average 70.2% of total inorganic P extracted from the
soil. The values for Fe-P, Al-P and Saloid-P were 15.5, 12.3 and 2.0%, respectively. All these fractions
were significantly interrelated meaning thereby that the P transformation is the culmination of release
processes from all the fractions and the system seemed to be dynamic. Wheat grain yield under ZT, CT
and MT was statistically similar (54.10, 52.43 and 51.75 q ha
-1
, respectively) but the values under ZT
were superior numerically over other practices. Grain yield of wheat increased with increase in P
application over control (46.10 q ha
-1
) under different tillage practices but was significant up to 60 kg
P
2O5
ha
-1
. Response yard stick values were higher under ZT than under MT or CT. The concentration
and uptake of N, P and K by both grain and stover in wheat were significantly affected by application
of P but significant differences were recorded only upto 60 kg P
2O5
ha
-1
.
Description
Keywords
Hybrids, Fruits, Heterosis, Planting, Developmental stages, Vegetables, Yields, Biological phenomena, Genotypes, Genetics