Available Nutrient Status and Fertility Capability Grouping of Soils of Bobbili Mandal, Vizianagaram District, Andhra Pradesh
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Authors
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P. SOWJANYA
Department of Soil Science and Agricultural Chemistry, Agricultural College, Bapatla - 522 101, Andhra Pradesh
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P. PRASUNA RANI
Department of Soil Science and Agricultural Chemistry, Agricultural College, Bapatla - 522 101, Andhra Pradesh
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P. MADHU VANI
Department of Soil Science and Agricultural Chemistry, Agricultural College, Bapatla - 522 101, Andhra Pradesh
Keywords:
Surface and sub-surface nutrient status, Micronutrients, Fertility capability modifiersAbstract
The soils of Bobbili mandal, Vizianagaram district were assessed for available nutrient status and grouped into fertility capability units by collecting surface (0-25cm) and subsurface (25-50 cm) soil samples from 50 representative locations. Based on elevation and drainage, the study area was divided into three physiographic units viz., uplands, midlands and lowlands. The soils were strongly acidic to moderately alkaline in reaction, non-saline to critical for germination, low to high in organic carbon, low to medium in available nitrogen, low to high in available phosphorus and potassium and sufficient in available sulphur. Among the micronutrients, the soils were deficient to sufficient in zinc, sufficient in manganese and copper while, sufficient at surface and deficient to sufficient at subsurface in iron. The soils under different physiographic units were grouped into a total of 20 fertility capability units based on fertility related constraints and variations in management requirements.
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