INTEGRATED NUTRIENT MANAGEMENT IN IRRIGATED WHEAT (Triticum aestivum L.)
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Date
2001-08-02
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
A liold cxpcriinciiL was conducLcd Lo sludy Ihe elTect of intcgraLed nutrient
management in irrigated wheat (Triticum aestivum L.) at the Main Research
Station, University of Agricultural Sciences, Dharwad during the post-rainy
season of 1999-2000. The experiment was laid out in a completely randomized
block design with four replications.
All growth parameters observed at different growth stages were
significantly influenced by the treatments except plant height and dry matter
accumulation in stem at 30 DAS. Application of 75 and 50 per cent of RDF along
with organics resulted in similar plant height, effective tillers and ear dry matter
accumulation as obtained with 100 per cent RDF + FYM + ZnS04. At 30 and 60
DAS, LAI ^d number of shoots did not differ due to treatments except control
and organics alone. However, at later stages application of 100 per cent RDF +
FYM + ZnS04 resulted in higher LAI than other treatments except 75 per cent
RDF + organics (0.85) at harvest. Significantly higher total dry matter
accumulation (20.18) was observed with addition of 100 per cent RDF + FYM +
ZnS04 at 30 DAS and it was at par with 75 per cent RDF + organics at later
stages.
Grain yield, number of grains and grain weight per ear did not differ
among treatments that received 100 per cent RDF + FYM + ZnS04, 75 and 50
per cent of RDF + organics. Substitution of 25 to 75 per cent of RDF with
organics resulted in similar ear length, 1000 grain weight, straw yield, grain to
straw ratio and harvest index as with 100 per cent RDF + FYM + ZnS04.
Significantly higher grain N (1.97%) and protein content (12.3%) than
other treatments was observed with application of 100 per cent RDF + FYM +
ZnS04 and it was at par with 75 and 50 per cent of RDF + organics. Grain fat
and crude fibre content did not differ significantly due to treatments. The
treatments that received 100 per cent RDF + FYM + ZnS04 and 75, 50 and 25
per cent of RDF with organics were at par with respect to N uptake. Substitution
of 25 to 50 per cent of RDF with organics and 100 per cent RDF + FYM + ZnS04
(26.1 kg/ha) resulted in similar P uptal<e and significantly higher than control
(18.0 kg/ha). Potassium uptake in all treatments was significantly higher than
control (101.3 kg/ha) although the treatments were at par.
Application of organics alone or in combination with fertilizers improved
infiltration rate, water stable aggregates, organic carbon, available nitrogen and
phosphorus over their initial values. Bulk density, soil pH and available
potassium were not significantly influenced by the treatments.
The net returns with 100 per cent RDF + FYM + ZnS04 (Rs.25365.34), 75
and 50 per cent RDF with organics (Rs.24561.94 and Rs.20682.35, respectively)
were on par with each other and significantly superior to other treatments.
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