Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810101380
Authors: MOUNIKA, P
Advisor: Ravindra Babu, P
Title: FERTILITY EVALUATION OF UPLAND SOILS OF KRISHNA DISTRICT, ANDHRA PRADESH
Publisher: Acharya N.G. Ranga Agricultural University
Language: en_US
Type: Thesis
Pages: 291
Agrotags: null
Keywords: FERTILITY, UPLAND, SOILS, KRISHNA DISTRICT, ANDHRA PRADESH
Abstract: An investigation was taken up to evaluate the fertility status of upland soils of Krishna district in Andhra Pradesh. Places were selected and soils were dug vertically down at two different depths (0-15 & 15-30 cm) and samples were collected for analysis from farmers fields in Vijayawada and Nuzivedu divisions of Krishna District. The coordinates at each location were recorded by using GPS equipment. The study area falls in semi-arid climate which is located on the east coast of India between 15°43’N and 17°10’N latitude and between 80°00’E and 81°33’E longitude. The climatic conditions of the district consist of extremely hot summers and moderately cold winters and may be classified as tropical. The mean annual rainfall in the region is about 1028 mm and is contributed mostly by the Southwest monsoon. The soils of study area comprised of two different textural classes, viz. sandy clay loam and clay for both surface and subsurface soil samples. Black soils are most dominant group in the study area and exhibited clayey in texture. The surface and subsurface soils were found to be neutral to highly alkaline in reaction. Electrical conductivity (EC) of the surface and subsurface samples varied from 0.12 to 0.72 dS m-1and from 0.11 to 0.83 dS m-1 with mean values of 0.42 dS m-1and 0.47 dS m-1, respectively. Cation exchange capacity (CEC) of surface soils ranged from 13.0 to 60.9 cmol (p+) kg-1 with a mean value of 36.95 cmol (p+) kg-1while it ranged from 15.2 to 64.8 cmol (p+) kg-1 with a mean value of 40 cmol (p+) kg-1in subsurface soils. Percent Base Saturation of surface soils ranged from 51.2-99.4% with mean of 75.3% while in subsurface soils it ranged from 27.6-99.7% with mean of 63.65%. Among the exchangeable cations, Ca2+ was most dominant cation on the exchange complex followed by Mg2+, K+ and Na+ in surface and subsurface soils of Krishna district. The divalent cations, like Ca2+ and Mg2+ were relatively less mobile yet among the two, Mg2+ ions were more mobile than Ca2+ ions. Relatively lower PBS has been observed in subsurface soils which might be due to less clay content and enhanced leaching of basic cations besides surface soils. High base saturation might be due to moderately alkaline reaction and high CaCO3 content, as the exchangeable complex of the soils were dominated by calcium and magnesium, which are main sources for base saturation. The surface and subsurface soils of the present study area were found to be low to medium in organic carbon content. The soils were low in available nitrogen and high in potassium. The available phosphorus ranged from low to medium in different samples with high amounts at surface. In general they followed a decreasing trend with depth. The available sulphur was sufficient in major part of the study area. Among micro nutrients copper and manganese were sufficient at both depths, while zinc was sufficient in 34 per cent and deficient in 66 per cent of surface soils where as in subsurface soils 73.6 percent are deficient. Iron was sufficient in 86 per cent and deficient in 14 per cent of surface soil and in subsurface soils, 85 percent are sufficient and 15 percent are found to be deficient.
Description: D5665
Subject: Soil Science and Agriculture Chemistry
Theme: FERTILITY EVALUATION OF UPLAND SOILS OF KRISHNA DISTRICT, ANDHRA PRADESH
Research Problem: FERTILITY EVALUATION OF UPLAND SOILS OF KRISHNA DISTRICT, ANDHRA PRADESH
These Type: M.Sc
Issue Date: 2018
Appears in Collections:Thesis

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