Volume 1 : Issue 2
1. A Study of Physio-Chemical Properties of Healthy and Declined Nagpur Mandarin Orchards .
Author(s): Prashant Joshi, Dhiraj Kadam, Shakti Tayde and Yogesh Dharmik
Abstract: The present investigation was carried out to characterize and classify some typical healthy and declined Nagpur mandarin gardens in Warud and Morshi tahsil’s of Amravati District (M.S.). Total forty two representative surface and depth wise soil samples from healthy and declined Nagpur mandarin gardens were collected and analyzed for various physico-chemical properties. The findings revealed that the texture of soil is clayey (40.0 to 59.0 per cent clay in healthy gardens and 47.4 to 61.4 per cent clay in declined gardens). The bulk density and porosity in healthy gardens varied from 1.51 to 1.67 Mg m-3, 35.85 to 43.02 per cent and in declined gardens, it varied from 1.51 to 1.66 Mg m-3 and 25.85 to 43.02 per cent respectively. The pH, organic carbon and CaCO3 content in healthy gardens soils varied from 7.50 to 8.0, 4.80 to 9.00 gm kg-1, 5.35 to 8.31 per cent and in declined gardens, it varied from 7.7 to 8.2, 1.95 to 3.75 gm kg-1, 6.71 to 10.53 per cent respectively. The electrical conductivity and cation exchange capacity of healthy gardens soil varied from 0.21 to 0.28 dSm-1, 45.92 to 55.53 cmol (p+) kg ha-1 and in declined gardens it varied from 0.22 to 0.32 dSm-1, 46.20 to 51.92 cmol (p+) kg ha-1 respectively. No significant difference was found in clay, bulk density, porosity, electrical conductivity and cation exchange capacity in healthy and declined gardens, however soil reaction was high in declined gardens than healthy gardens. Organic carbon content was high in healthy gardens than declined gardens and free lime content was found low in healthy gardens than declined ones. Depth wise distribution showed that bulk density, pH and electrical conductivity increase with soil depth. Organic carbon and cation exchange capacity decrease with soil depth. The available nitrogen, phosphorus and potassium content of healthy gardens surface soils varied from 206.0 to 273.7 kg ha-1, 25.0 to 38.3 kg ha-1, 324.0 to 672.0 kg ha-1 and in declined gardens it varied from 135.4 to 206.8 kg ha-1, 19.8 to 23.3 kg ha-1, 364.0 to 750.4 kg ha-1 respectively. Available nitrogen and phosphorus content in healthy gardens found more supporting than declined ones. Depth wise distribution showed that available nitrogen and phosphorus showed decreasing trend with the soil depth.