Browsing by Author "Selvamani, V."

Now showing 1 - 20 of 26
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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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    Cowpea: A potential nutrient source in coconut garden
    (2017-07) Subramanian, P.; Surekha, R.; Ravi Bhat; Selvamani, V.
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    Cowpea: A potential nutrient source in coconut garden
    (2017-07) Subramanian, P.; Surekha, R.; Selvamani, V.; Ravi Bhat
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    DETERMINATION OF SOIL PHYSICAL PROPERTIES
    (2018) Neenu, S.; Selvamani, V.
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    Diagnosis and management of soil fertility constraints in coconut (Cocos nucifera) : A review
    (2017-06) Malhotra, S.K.; Maheswarappa, H.P.; Selvamani, V.; Chowdappa, P.
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    First report on the association of ‘Candidatus Phytoplasma asteris’ with lethal wilt disease of coconut (Cocos nucifera L.) in India
    (2020) Merin Babu; Thangeswari, S.; Joseph Rajkumar, A.; Krishnakumar, V.; Karthikeyan, A.; Selvamani, V.; Daliyamol; Vinayaka Hegde; Maheswarappa, H.P.; Anitha Karun
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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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    IMPORTANCE OF SOIL TEST BASED FERTILIZER RECOMMENDATION FOR ARECANUT AND COCOA
    (2018) Ravi Bhat; Selvamani, V.; Karthika, K.S.
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    Inorganic phosphorus fractions and phosphorus availability in long term fertilizer cum manurial trials under coconut cultivation
    (2023) Neenu, S.; Ravi Bhat; Selvamani, V.; Subramanian, P.
    Phosphorus is one of the major nutrients required for coconut production. The information about the fate of native and applied phosphorus in soil is essential for better management of the nutrient. The changes on inorganic P fractions and P availability in soil after 43 years of coconut cultivation were studied from a long term fertilizer cum manurial experiment at CPCRI, Kasaragod. There were 6 treatments viz. tillage with organic and inorganic fertilizer, tillage with inorganic fertilizer, inorganic fertilizers with basin forking, tillage alone, herbicide application without tillage and fertilizer and the control. Soil samples were taken at two depths (0-30 and 30-60 cm) from coconut basin for analysis. Phosphorus was fractionated into Easily Soluble P (ES-P), Aluminium P (AI-P), Iron P (Fe-P), Calcium P (Ca-P) and Reductant Soluble P (RS-P) through sequential extraction. The dominant phosphorus fraction in the coconut basin at 0-30 cm depth was Ca-P and the trend is as follows: Ca-P> Fe-P> RS-P>Al-P>ES-P. However, at 30-60 cm depth, Fe- P became the dominant fraction and the trend is Fe-P>Ca-P>RS-P>Al-P>ES-P. Long-term phosphorus fertilization would facilitate the accumulation of soil Ca-P, and thus improve soil P availability. In the interspaces, Fe-P was the dominating fraction in both the depths followed by Ca-P and RS-P. The difference in P fractions in fertilized and non-fertilized plots clearly showed that the fertilized plots have high content of all the inorganic phosphorus fractions in both the depths. Application of mineral P along with forking in basin showed a high concentration of all the inorganic P fractions compared to other fertilizer applied treatments.
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    LABORATORY SAFETY MEASURES
    (2018) Karthika, K.S.; Selvamani, V.
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    Nutrition
    (2017) Selvamani, V.
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    ORGANIC FARMING IN COCONUT
    (2018) Subramanian, P; George V. Thomas; Krishnakumar, V.; Alka Gupta; Murali Gopal; Selvamani, V.
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    Performance of black pepper in coconut based high density multi-species cropping system under different nutrient managements
    (2016-08) Subramanian, P.; Maheswarappa, H.P.; Zachariah, T.J.; Surekha, R.; Selvamani, V.; Ravi Bhat
    Coconut based high density multi-species cropping system (HDMSCS) is recommended to obtain maximum income and better utilization of resources. The crops grown under HDMSCS include fruits, vegetables, spices etc. Black pepper (Piper nigrum L.), an important spice crop, is generally a component under coconut based cropping systems. In the present study, the performance of black pepper under coconut based HDMSCS (involving banana, nutmeg, cinnamon, and other annuals viz., turmeric, ginger and elephant foot yam as intercrops) was evaluated, in terms of yield and quality parameters. The observations, recorded for four years (2009-10 to 2012-13) under three different nutrient management practices, indicated no significant difference in yield and quality parameters of black pepper. The pooled data of four years indicated a mean pepper yield of 2.4 kg vine-1, and quality parameters viz., per cent of oil, oleoresin, piperine and bulk density (g L-1) were 2.3, 9.8, 3.1 and 500.7, respectively. Under different nutrient management practices, the yield of both black pepper and coconut increased by 166 and 9 per cent, respectively, compared to the pre-treatment period (2005-07). The present study indicated that there was no reduction in yield of coconut when black pepper was grown in the basin and depending upon the availability of resources, farmers can follow the nutrient management practices.
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    PLANT NUTRIENT ANALYSIS
    (2018) Selvamani, V.; Neenu, S.