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Accueil du site → Master → Inde → 2015 → CHARACTERIZATION OF SALINE SOILS AND OSMOTIC ADJUSTMENT OF PLANTS IN RELATION TO SOIL SALINITY

Acharya N G Ranga Agricultural University, Guntur (2015)

CHARACTERIZATION OF SALINE SOILS AND OSMOTIC ADJUSTMENT OF PLANTS IN RELATION TO SOIL SALINITY

NANCY JASMINE, K

Titre : CHARACTERIZATION OF SALINE SOILS AND OSMOTIC ADJUSTMENT OF PLANTS IN RELATION TO SOIL SALINITY

Auteur : NANCY JASMINE, K

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

Grade : Master of Science in Agriculture 2015

Résumé partiel
The present study entitled “Characterization of saline soils and osmotic adjustment of plants in relation to soil salinity” was carried out by collecting 100 representative soil and plant samples (existing natural vegetation and chickpea) from Uppugunduru region of Prakasam district, Andhra Pradesh. Soil samples and natural vegetation were collected during last week of June while, chickpea samples were collected during November (flowering) and January (harvesting stage). The soil samples were processed and analysed for various physical, physico-chemical, electro-chemical and biological properties. The leaf samples were analysed for photosynthetic pigments, relative water content, nitrate reductase activity, membrane injury index, N, P, proline and ionic ratios (Na+/K+ and Ca2+/Mg2+) by following standard procedures. The soils of Uppugunduru region varied from clay to sandy clay in texture. WHC was relatively high in clay soils while, higher bulk density values were recorded in sandy clays than clay soils. The soils were found to be neutral to strongly alkaline (pH 7.2 to 8.5), non saline to very strongly saline (0.74 to 40.02 dS m-1) and low to medium in organic carbon (1.2 to 6.80 g kg-1). Cation exchange capacity of the soils ranged from 30.80 to 53.71 cmol (p+) kg-1 soil. The most dominant exchangeable cation was calcium followed by magnesium, sodium and potassium. The soils of the region were low in available nitrogen, medium to high in available phosphorus and potassium and deficient to sufficient in available sulphur. Among the DTPA extractable micronutrient cations, manganese and copper were found to be above the critical limit, whereas the soils were deficient to sufficient in zinc and iron

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