Browsing by Author "Duraisami, V.P."

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    Characterization and mapping irrigation water quality of coconut groves in Coimbatore and Tiruppur districts of Tamil Nadu, India
    (Indian Society for Plantation Crops, 2014-04) Selvamani, V.; Duraisami, V.P.
    It is essential to characterize and map the irrigation water quality to foresee its adverse effect on soil health and productivity. A study was undertaken to generate irrigation water quality maps of coconut land cover in Coimbatore and Tiruppur districts of Tamil Nadu, India using geographic information system (GIS). Samples were collected from 110 geo-referenced collection sites. The irrigation water quality was assessed and thematic maps were developed. From the maps it was found that nearly 12 per cent area had poor quality irrigation water with respect to pH. Majority of the samples were safe and only around 10 per cent samples showed salinity hazard. Based on sodium adsorption ratio (SAR) the irrigation water of major area were in fair (53%) and poor (50%) classes. Irrigation water quality in terms of residual sodium carbonate (RSC) in nearly 42 per cent of the coconut land cover was under unsuitable class. The soluble sodium percentage (SSP) based classification showed good quality irrigation water in most of the area (97%). Around 51 per cent of the area was having irrigation water of unsatisfactory quality based on potential salinity. The permeability index (PI) of the irrigation water of 14 per cent area was found to be unsatisfactory.
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    Identifying and mapping leaf nutrient based constraints for coconut productivity in Coimbatore and Tiruppur districts of Tamil Nadu state, India
    (2014-08) Selvamani, V.; Duraisami, V.P.
    In the existing perennial plantations like coconut, leaf nutrient testing will be a promising tool to identify the existing crop nutrition related constraints and for formulating the suitable management options to improve the crop productivity. Therefore this study was conducted with the objectives of identifying the nutrient deficiency and mapping the spatial distribution of leaf based nutrient deficiency for site specific nutrient management. The study area was coconut land cover of Coimbatore and Tiruppur districts of Tamil Nadu state, India. Leaf samples and yield data were collected from 110 geo-referenced sites. Leaf samples were analysed for macro and micronutrients. The nutrient deficiency maps were developed for macro and micronutrient management. Thematic maps showed that N status was deficient in 95.99 per cent, P in 86.19 per cent, K in 1.42 per cent and Mg in 0.81 per cent area of the coconut land cover area. Ca and S were observed to be sufficient. Fe was found to be deficient in 0.64 per cent, Mn in 0.84, Zn in 0.54 per cent, Cu status in 2.62 per cent and B in 10.72 per cent of the coconut land cover area.
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    Identifying and mapping soil fertility constraints for coconut in Coimbatore and Tiruppur districts of Tamil Nadu state, India
    (2014-12) Selvamani, V.; Duraisami, V.P.
    The plantation crops like coconut being perennial in nature mine nutrients from limited volume of soil for a long time and hence, to sustain the high productivity, soil nutrients status should be monitored and have to be replenished. The present study was carried out to identify and map the soil fertility constraints for enabling site-specific nutrient management to enhance the productivity of soil. Study area was the coconut land cover of Coimbatore and Tiruppur districts of Tamil Nadu state. In this study, survey was carried out in the coconut plantations of these districts (73 sites in Coimbatore and 37 sites in Tiruppur) and soil samples were collected and analyzed for their physico-chemical and chemical properties. Using the analytical results thematic maps on soil fertility constraints were prepared. The developed maps showed that 62 and 30 per cent of soils of coconut land cover found to be in moderately alkaline and alkaline condition respectively. Around 96 per cent area was in non-saline condition. Organic carbon status was low in 65 per cent of the coconut land cover. Available N, P, and K were low in 65, 0.8 and 0.02 per cent area respectively and S was deficient in 0.05 per cent area. Fe deficiency was recorded in 7 per cent of the area and there was no Mn deficiency in the study area. Available Zn, Cu and B were deficient in 89, 62 and 5 per cent area respectively.
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