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Titre : STUDIES ON IDENTIFICATION OF SOIL RELATED CONSTRAINTS IN GROUNDNUT GROWING AREAS OF EASTERN MANDALS IN CHITTOOR DISTRICT OF ANDHRA PRADESH

Auteur : SRAVANI, D

Université de soutenance : Acharya N G Ranga Agricultural University, Guntur

Grade : Master of Science in Agriculture 2015

Résumé
The present investigation was carried out to study the physical characteristics, physico-chemical characteristics, nutrients status of groundnut grown soils and index leaf of groundnut crop grown in different villages of various Eastern mandals in Chittoor district, Andhra Pradesh. For this purpose, 60 fields were selected after the harvest of the groundnut crop and the soil samples were collected from 0-30 cm depth. Groundnut Index leaf samples were also collected from the plants in the fields from where the soil samples were drawn. The soil samples were analysed for their physical and physico-chemical characteristics viz., soil texture, pH, EC, organic carbon, CEC and free calcium carbonate and chemical characteristics viz., available N, P, K, Ca, Mg, S, Fe, Mn, Zn, and Cu. Similarly, index leaf samples were also analysed for their N, P, K, Ca, Mg, S, Fe, Mn, Zn and Cu. The texture of the groundnut grown soils varied from sandy loam to sandy clay loam. The soils were neutral to strongly alkaline in reaction, nonsaline and low to medium in organic carbon. The CEC of the groundnut grown soils ranged from 4.30 to 13.78 cmol (p+) kg-1 soil with a mean value of 8.11 cmol (p+) kg-1 soil. All the soils were non calcareous in nature. xiii Regarding the nutrients status, the groundnut grown soils were low in available nitrogen and low to medium in available phosphorus and potassium. All the groundnut grown soils were sufficient in available Ca, Mg and S. Available Fe, Mn and Cu in groundnut grown soils were above their respective critical limits whereas 60 per cent of the samples were deficient in available Zn. The index leaf nitrogen content in the study area revealed that 41.6 per cent samples were found to be adequate and 58.4 per cent were found to be deficient.

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