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DELINEATION OF NUTRIENT STATUS OF SOILS IN Bt COTTON GROWING AREAS OF KURNOOL DISTRICT OF ANDHRA PRADESH

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Title DELINEATION OF NUTRIENT STATUS OF SOILS IN Bt COTTON GROWING AREAS OF KURNOOL DISTRICT OF ANDHRA PRADESH
 
Creator SATISH, S
 
Contributor SREENIVASULU REDDY, KOTU
 
Subject nutrients, cotton, genetic soil types, concentrates, carbon, clay, yields, planting, calcium, fruits
KURNOOL DISTRICT, ANDHRA PRADESH
 
Description The present investigation was carried out to study the Delineation of nutrient status of Bt cotton grown soils under predominant soil orders of different villages in various mandals in Kurnool district of Andhra Pradesh. For this purpose, ninety holdings with standing Bt cotton crop at flowering stage (60 DAS) were selected and the soil samples were collected from 0 - 30 cm depth. The plant samples were also collected from the plants in the fields from which soil samples were drawn. The soil samples were analyzed for their physical and physico-chemical characteristics viz., soil texture, bulk density, pH, EC, OC, free calcium carbonate; and chemical characteristics viz., available N, P, K, Ca, Mg, S, Zn, Cu, Fe, Mn and B. Similarly plant samples were analysed for nutrient concentration (N, P, K, Ca, Mg, S, Zn, Cu, Fe, Mn and B) in index tissues and also nutrient uptake in whole plant at 60 DAS (flowering stage) of Bt cotton crop. Ultimately yield was recorded at harvest.
Based on the status report of Scarce Rainfall Zone, 2001, the soils were identified into three predominant orders viz; Alfisols, Inceptisols and Vertisols. From each of the three orders, 30 holdings were selected. The soils were slightly acidic to moderately alkaline in reaction, non saline and
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medium to high in organic carbon. All the surface soils are non calcareous in nature.
Regarding the available nutrients status, the Bt cotton grown soils were medium in available nitrogen, high in available phosphorus and potassium. All the Bt cotton grown soils were sufficient in Ca, Mg and S.
Available Fe, Mn, Zn, and Cu were above their respective critical limits while boron deficiency was registered in Alfisols and Inceptisols were 53.33 and 20.00 per cent of samples, respectively.
In Alfisols, available N was positively and significantly correlated with silt content. In Inceptisols, available K was negatively and significantly correlated with sand content; whereas, in Vertisols, available N was positively and significantly correlated with bulk density. In Alfisols, available Mg was negatively and significantly correlated with bulk density and EC and available Ca was positively and significantly correlated with CaCO3. In Inceptisols, available Ca was positively and significantly correlated with clay content and in Vertisols, available Ca was positively and significantly correlated with clay content and pH and negatively and significantly correlated with sand content.
In Alfisols, available B was positively and significantly correlated with clay and bulk density and negatively and significantly correlated with sand content. In Inceptisols, available B was negatively and significantly correlated with EC and CaCO3 and available copper was positively and significantly correlated with pH. Vertisols did not show any correlation between micronutrients and physical and physico-chemical properties.
The index leaf nitrogen phosphorus and potassium were in the optimum range. The leaf N, P and K were significantly and positively correlated with their respective soil nutrients. The leaf Ca, Mg and S contents were found to be sufficient to high and showed positive significant correlation with their respective soil nutrients.
All the leaf micronutrients (Fe, Mn, Zn, Cu and B) were found to be sufficient and showed positively and significantly correlated with their respective soil nutrients.
Among the nutrient uptake of major nutrients in Bt cotton, Vertisols registered the maximum uptake of P and K. Incase of secondary nutrients, Vertisols contained the maximum uptake of Ca and Mg compared to Inceptisols and Alfisols. Incase of micronutrients, highest uptake of Fe, Zn, and B were registered in Vertisols. With regard to dry matter, not much variation among the three soil orders was recorded. The highest seed cotton yield (25.56 q ha-1) was recorded in Vertisols.
 
Date 2016-06-03T14:20:07Z
2016-06-03T14:20:07Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66722
 
Language en
 
Relation D8979;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY