Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/67608
Authors: JAYARAMARAO DARAPUREDDI
Advisor: RAVINDRA BABU, P
Title: SOIL FERTILITY EVALUATION OF NAIRA VILLAGE, SRIKAKULAM DISTRICT WITH SPECIAL REFERENCE TO SULPHUR STATUS
Publisher: ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
Language: en
Type: Thesis
Series/Report no.: D9394;
Agrotags: sulphur, extraction, inorganic acid salts, carbon, clay, economic resources, nitrogen, sampling, calcium, nutrients
Abstract: A project was under taken to evaluate the fertility status in soils of Naira village, Srikakulam district with special reference to sulphur status. Hundred and fourteen soil samples were collected in representative areas of the village by using revenue map of Naira. The soil samples were analyzed for their physicochemical properties and forms of sulphur. The inorganic sulphate sulphur was extracted by different extractants viz. 0.15% calcium chloride, 0.5 M sodium bicarbonate, 1 N ammonium acetate, 0.01 M mono calcium phosphate and Morgan’s reagent. Correlation studies were also carried out among different forms of sulphur and between soil properties. The results indicated that 34.2 per cent were neutral, 10.5 per cent were slightly acidic, while the remaining 55.3 per cent of the samples were moderately acidic to strongly acidic in soil reaction. All the samples were non-saline. The soils were low in organic carbon and available nitrogen, medium in available phosphorus and potassium. Exchangeable calcium, magnesium and available sulphur, DTPA extractable manganese, iron and copper were above critical limits, whereas zinc content was below critical limit in few soils. The soils were non-calcareous in nature and low in cation exchange capacity. Texturally they were loamy sand, sandy loam, sandy clay loam and sandy clay showing wide variation in texture. Among the different forms of sulphur, total sulphur was high followed by organic sulphur, heat soluble sulphur, inorganic sulphur and adsorbed sulphur. Organic sulphur contributed to more than 90 % of the total sulphur and all the soils were sufficient in sulphur content (based on critical limit value of 10 ppm). Inorganic sulphate sulphur content extracted with different extractants were in the following sequence: 0.01M Ca (H2PO4)2 >0.5 M NaHCO3 > 0.15 % CaCl2 > Morgan’s reagent > 1 N CH3COONH4 extractable sulphur. This revealed that the phosphorus containing solution extracted more amount of sulphur from soil because of some adsorbed sulphate also got extracted. Calcium chloride extracted only soluble sulphate but cannot displace adsorbed sulphate. Similarly, the ammonium acetate being poor replacer of sulphate, solubilises some of the inorganic sulphur compounds of the soils. Hence, the amount of extracted sulphate sulphur content would be low in case of 0.15% CaCl2 and 1 N CH3COONH4 extractants than others. Simple correlation studies indicated that the negative relation of pH with available phosphorus, iron and manganese contents of soils. Organic carbon content was positive and significantly related with the available N, P, K, Ca, Mg, S, Zn and Cu contents of soils. Interrelationships were worked out within different forms of sulphur. Highly significant positive correlations among different forms were observed. Organic carbon showed significantly positive relation with all forms of sulphur and sulphate sulphur extracted with different extractants. Clay and CEC had positive significant relation with different forms of sulphur and sulphate sulphur. Regression equations indicated that among the sulphate sulphur extractants showed significant relation and sulphur forms also showed positive relation with organic carbon. It was concluded that soil properties (especially pH, OC, clay and CEC) were the major determinants of sulphur in different forms and sulphur in one form continues to transform into another maintaining a dynamic equilibrium. The study indicated that addition of organic manures and incorporation of crop residues to soils will increase availability of nutrients to the soil and also improves the availability of sulphur.
Issue Date: 2012
Appears in Collections:Theses

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