INTEGRATED NUTRIENT MANAGEMENT ON PHYSICAL CONDITIONS, SOIL FERTILITY AND PRODUCTIVITY OF CROPS IN DRY LAND VERTISOL
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Date
2004-01-22
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK ,BANGALORE
Abstract
Two field experiments were conducted at Regional Research Station,
Bijapur on Inceptisol and Vertisol to investigate the effect of integrated nutrient
management system on soil properties, nutrient uptake, crop yields and moisture
utilization under dry land conditions. The treatments consisted of organic N 50
per cent in conjunction with 50 per cent N through inorganic nutrients. The crop
rotation followed were bajra-pigeonpea in inceptisol and rabi sorghum-chickpea
in vertisol. The lowest bulk density was recorded with incorporation of subabul to
meet 50 per cent N in conjunction with 50 per cent RDF. Application of organic
materials like sunhemp or subabul incombination with fertilizer improved the soil
physical properties. Cation exchange capacity, exchangeable calcium, available
nutrients N, P, K and Zn, Mn Cu and Fe were increased significantly with organic
materials in conjunction with inorganic materials. The highest grain yield of bajra
(1767 kg ha"') was obtained with 50 per cent N application. Whereas pigeonpea
(801 kg ha"') recorded with 50 per cent RDF shallow black soils. The highest
grain yield of rabi sorghum (1931 kg ha'^) and chickpea (667 kg ha"') were
obtained with 50 per cent N through green manures with 50 per cent RDF in deep
black soils. The uptake of Nitrogen, phosphorus, potassium and zinc, manganese,
copper, iron increased by crops significantly with 50 per cent organic in
combination with 50 per cent inorganics. Water use efficiency of bajra crop
(35.82 kg ha ' cm"') was increased significantly with application of 50 j)er cent
Nitrogen, hicase of pigeonpea water use efficiency (20.88 kg ha"' cm"') was
increased significantly with application of 50 pier cent N through subabul with 50
per cent RDF in shallow black soils. Similarly, in rabi sorghum and chickpea crop
rotation and (19.62 kg ha"' cm"') were increased significantly with 50 per cent N
through subabul with 50 pier cent RDF respectively in deep black soils. In shallow
black soils with application of 50 per cent RDF along with subabul loppings in
bajra-pigeonpea crop rotation is more economical which recorded higher net
profit of Rs.7341 with BC ratio of 1.13. Whereas in deep black soils with
application of 50 pier cent RDF along with 50 per cent N through in situ sunhemp
in rabi sorghum chickpea crop rotation recorded maximum net returns of
Rs. 11250 with BC of 1.69. Among the crop rotations growing of sorghumchickpea
in deep black soil is more profitable when compared to growing of
bajra-pigeonpiea crop rotation in shallow black soil
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