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University of Horticultural Sciences, Bagalkot (2018)

CHARACTERIZATION AND SPATIAL FERTILITY STATUS OF BLACK SOILS OF BILAGI AND BAGALKOT TALUKAS

MUSHTOOR, SHARANAGOUDA S.

Titre : CHARACTERIZATION AND SPATIAL FERTILITY STATUS OF BLACK SOILS OF BILAGI AND BAGALKOT TALUKAS

Auteur : MUSHTOOR, SHARANAGOUDA S.

Université de soutenance : University of Horticultural Sciences, Bagalkot

Grade : Master of Science (MS) 2018

Résumé
A soil survey was conducted for characterization and spatial fertility status of Bilagi and Bagalkot taluka areas irrigated with different water sources and different cropping systems. The pH of soils ranged from moderate alkaline to high alkalinity and it differed significantly with and without irrigations. The electrical conductivity (ECe) also varied significantly among soils irrigated with different water sources. Majority of the soils studied were calcareous in nature with high CaCO3 content. Soil organic carbon (SOC) was in medium range. The available nitrogen content ranged from low to medium while, available potassium ranged from medium to high. Available-P2O5 was observed in low to medium range and significant difference was found between irrigation water sources or cropping systems. Among secondary nutrients, available Ca and Mg contents were observed in high range and no significant differences were observed between sources of irrigation water and cropping systems. Available-S content in these soil was recorded medium to high range. Among micro nutrient contents, DTPA-Cu, Fe and Mn were observed in higher range and differed significantly with water sources and cropping systems. However, DTPA-Zn was found in all the three low, medium and high ranges and differed significantly. In terms of nutrient availability in different cropping systems, It was evident that the soil fertility was varied to a greater extent by the sources of irrigation water, and in terms of cropping system it was observed in the order : Sugarcane > Maize/Groundnut-Onion > Jowar cropping systems.. Correlation showed that the soil pH, ECe, CaCO3 and SOC recorded major influence on nutrient availability. The soil pH was found negatively and found significantly correlated with available-N, DTPA – Zn and DTPA – Cu contents. The soil organic-C had influenced on available-N, available-P, available-S and DTPA-Zn significantly. The soil EC showed correlation with Available- Ca, Mg, S, DTPA – Zn and DTPA – Cu contents. The soil CaCO3 content showed negative correlation with available-N, available-P2O5, DTPA-Znand

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