Browsing by Author "Sankaranarayanan, M.P."
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Item Characteristics of coconut soils of India- I. Morphology, some physico-chemical characteristics and taxonomy(1978) Hameed Khan, H.; Sankaranarayanan, M.P.; Narayanan, K.B.Item Chemical studies on the leaf and root (wilt) diseases of coconuts in Travancore-Cochin : V. The effect of lime and ash on disease conditions(2007-02-08) Rajappan Chettiar, M.; Verghese, E.J.; Sankaranarayanan, M.P.Item Chemical studies on the leaf and root (wilt) diseases of coconuts in Travancore-Cochin : VII. Cadmium content of coconut soils and coconut leaves(2007-02-08) Varghese, E.J.; Sankaranarayanan, M.P.; Menon, K.P.V.Item Chemical studies on the leaf and root (wilt) diseases of coconuts in Travancore-Cochin II. Nutrient content of leaves of healthy and diseased trees(2007-02-08) Verghese, E.J.; Sankaranarayanan, M.P.; Menon, K.P.V.Item Coconut soils on the East Coast of India(2007-02-08) Sankaranarayanan, M.P.; Velayutham, M.Item Comparative efficiency of selected phosphates as P-carriers for coconut (Cocos nucifera L.)(2007-02-08) Hameed Khan, H.; Sankaranarayanan, M.P.; Joshi, O.P.; George, M.V.; Narayana, K.B.Item Comparative efficiency of selected phosphates as P-carriers for coconut (Cocos nucifera L.)(1985) Hameed Khan, H.; Sankaranarayanan, M.P.; Joshi, O.P.; George, M.V.; Narayana, K.B.The results of a field experiment conducted for six years on laterite soil showed that single superphosphate, ammonium phosphate, nitrophosphate and rock phosphate had similar effects on the yield of nuts palm yr . However, when percentage yield increase over pretreatment yield was computed, rock phosphate proved best, followed by ammonium phosphate. Regression analysis revealed an optimum interaction between soil available P and leaf P for rock phosphate. The soil available P increased with the increase in the levels of P applied. Nitrophosphate increased the soil available P to a maximum, followed by ammonium phosphate, single superphosphate and rock phosphate. Fertilizer-P application generally reduced soil pH which was most marked with ammonium phosphate. The treatments showed marginal mobility of P to the subsoil which has been attributed to mechanical movement as a result of cultural operations in the coconut basin. Higher levels of applied P influenced the leaf P values which were not reflected in the yield. Costs of fertilizer indicated that rock phosphate as a P-carrier is cheapest.Item Effect of NPK fertilisers on trace element nutrition of three coconut genotypes(1975) Kamala Devi, C.B.; Wahid, P.A.; Pillai, N.G.; Sankaranarayanan, M.P.The micronutrient status of soil and leaf was studied in three coconut genotypes, West Coast Tall, Tall x Dwarf, and Dwarf x Tall, receiving three levels of NPK fertiliser combinations. The lowering of pH by NPK treatments enhanced the availability of Mn, Fe, and Al in soil. However, only Mn was taken up by the palm in larger amounts. Water soluble Mn in soil was highly correlated with plant uptake. The micronutrient requirements of the three genotypes were similar. Zn and Cu requirements of the palm were increased by increased NPK application. The implication of enhanced micronutrient availability in soil following NPK fertilization is discussed.Item Effect of NPK fertilisers on trace element nutrition of three coconut genotypes(2007-02-08) Kamala Devi, C.B.; Wahid, P.A.; Pillai, N.G.; Sankaranarayanan, M.P.The micronutrient status of soil and leaf was studied in three coconut genotypes, West Coast Tall, Tall x Dwarf, and Dwarf x Tall, receiving three levels of NPK fertiliser combinations. The lowering of pH by NPK treatments enhanced the availability of Mn, Fe, and Al in soil. However, only Mn was taken up by the palm in larger amounts. Water soluble Mn in soil was highly correlated with plant uptake. The micronutrient requirements of the three genotypes were similar. Zn and Cu requirements of the palm were increased by increased NPK application. The implication of enhanced micronutrient availability in soil following NPK fertilization is discussed.Item Effect of phosphorus skipping on the yield and nutrition of coconut palm (Cocos nucifera L.)(2007-02-08) Hameed Khan, H.; Sankaranarayanan, M.P.; George, M.V.; Narayana, K.B.The skipping phosphorus fertiliser application to adult coconut palms has resulted in the reduction of soil available P from 84 to 59 ppm at 0-30 cm depth and 24 to 13 ppm at 30-60 cm depth in the coconut basins. Neither a reduction in soil available phosphorus nor an increase consequent to fertiliser application at two levels for the past six years has significantly influenced foliar P levels and yield. The possibility of skipping application of phosphatic fertilisers to adult coconut groves in soil where available P is around 24 ppm at 30 to 60 cm depth is outlined. The usefulness of foliar P levels as a guide to fertiliser application seems to be doubtful.Item A note on Saline Water Irrigation to Coconut Palm Cocos nucifera Linn in Sandy Loam Soil.(1975) Nagarajan, M.; Sankaranarayanan, M.P.; Nelliat, E.V.Item Soils that Support Coconut in the West Coast(1976) Sankaranarayanan, M.P.; Velayutham, M.