Browsing by Author "Joshi, O.P."
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Item Apply organic manure to reduce coconut mortality on coastal sands(2007-02-08) Nambiar, C.K.B.; Joshi, O.P.Item Available Micronutrient Status of the Coconut-tract of Kasaragod District, Kerala(1986-12) Manikandan, P.; Joshi, O.P.; Khan, N.H.; Biddappa, C.C.Item Available micronutrient status of the coconut-tract of Kasaragod District, Kerala(2007-02-08) Manikandan, P.; Joshi, O.P.; Khan, H.H.; Biddappa, C.C.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 coir dust on mineralisation of urea Nitrogen in coconut growing red sandy loam soil (Arenic paleustults)(2007-02-08) Joshi, O.P.; Hameed Khan, H.; Biddappa, C.C.; Manikandan, P.Item Effect of coir dust on mineralisation of urea nitrogen in coconut growing red sandy loam soils (Arenuc Paleustults)(1985-12) Joshi, O.P.; Hameed Khan, H.; Biddappa, C.C.; Manikandan, P.Laboratory incubation studies revealed that blending urea with retted and unretted coir dust resulted in inhibition/immobilization of urea nitrogen. Blending of urea with unretted coir dust in 1: 1 proportions resulted in accumulation of NH4+-N and retted coir dust in the same proportion led to lowest production of NH4+-N. During the incubation period NOj -N appeared to be withdrawn from the system in urea blended with unretted coir dust (1:1) treatment, whereas its production was lower in the case of other combinations of urea with retted (1: 1 and 9 :1) and unretted coir dust (9:1) compared to urea. Production of total mineralised nitrogen was consistently lowest when urea was blended with retted coir dust (1: 1). Unretted coir dust (1:1) produced lower mineralised nitrogen than urea alone and the other blendings with lower proportions of retted and unretted coir dust (9: 1) showed intermediate behaviour. The results indicated the usefulness of blending urea with coir dust for controlled and gradual release of urea nitrogen. It has a bearing in the fertilizer programmes for perennial plantation crops largely grown in soils prone to heavy leaching losses.Item Effect of coir dust on mineralisation of urea, nitrogen in coconut growing red sandy loam soils (Arenue Paleustults)(Indian Society for Plantation Crops, 1985-12) Joshi, O.P.; Hameed Khan, H.; Biddappa, C.C.; Manikandan, P.Item Effect of heavy metals on micronutrient nutrition of coconut(1988-10) Biddappa, C.C.; Khan, H.H.; Joshi, O.P.; Manikandan, P.The influence of root feeding of Cd, Al, Cr, Ba, Bi and Pb on the micro-nutrient concentration in coconut crown was studied. Results indicate that the concentration of Fe, Mn, Zn and Cu had, in general, increased due to heavy metal treatments in all the leaf positions. Significantly higher concentration of Fe due to Cr treatment, Mn due to Bi, Zn due to Ba and Cu due to Pb was observed.Item Effect of heavy metals on micronutrient nutrition of coconut(2007-02-08) Biddappa, C.C.; Khan, H.H.; Joshi, O.P.; Manikandan, P.The influence of root feeding of Cd, Al, Cr, Ba, Bi and Pb on the micro-nutrient concentration in coconut crown was studied. Results indicate that the concentration of Fe, Mn, Zn and Cu had, in general, increased due to heavy metal treatments in all the leaf positions. Significantly higher concentration of Fe due to Cr treatment, Mn due to Bi, Zn due to Ba and Cu due to Pb was observed.Item Effect of NPK fertilization on the mineral nutrition and yield of three coconut genotypes(1986) Hameed Khan, H.; Gopalasundaram, P.; Joshi, O.P.; Nelliat, E.V.Annual application of NPK fertilizers over a 18 year period to coconut on red sandy loam soils resulted in a minimal increase in mineralisable N, but in a marked increase in available P and K. Plant N levels, however, reflected the improved N nutrition but did not reach sufficiency levels found elsewhere. An available P status of 15 ppm in the control plots kept leaf P at sufficiency levels. P fertilizers did not increase the P content of leaves. K fertilizers raised the K leaf content to sufficiency levels. Doubling the M, fertilizer rates of 500 gN, 220 gP and 830 gK per palm per year had no effect on N, P and K levels in the palm leaves. Changes in K levels of the leaves had antagonistic effects on leaf Mg (r = — 0.68**) and leaf Na (r = — 0.87 **). As this effect brings leaf Mg close to deficiency values palms receiving K might need additional Mg as well. The findings and interpretation of soil and leaf analysis data were confirmed by large yield responses to application of NPK fertilizers. Genetic differences between palms in their response to levels of nutrient supplies were apparent. The CDO X WCT hybrid out-yielded the high yielding WCT variety especially when NPK was given at the M, level. The response in yield to applied fertilizers was linear for WCT and curvilinear for the hybrids CDO X WCT and WCT X CDO.Item Effect Of Organic Manuring On Some Physical Properties And Water Retention Of Coastal Sand.(1982) Joshi, O.P.; Nambiar, C.K.B.; Hameed Khan, H.Item Effect of root feeding of heavy metals on the leaf concentration of P, K, Ca and Mg in coconut (Cocos nucifera L.)(1987) Biddappa, C.C.; Khan, H.H.; Joshi, O.P.; Manikandan, P.The effect of supplying various metals viz. Pb, Cd, Al, Bi, Cr, Cu and Ba to the roots of coconut palms on the P, K, Ca and Mg concentration in the leaves of coconut palms was investigated. The results showed that compared with the control the amount of leaf phosphorus was reduced by all the metals. The K concentration in the leaves was reduced by Al, Cd and Ba but increased by Bi and Cr. Leaf Ca concentration was decreased by Al and Pb treatments and increased by Cd, Cr and Ba. The amount of magnesium in the leaves was low in palms receiving the Al and the Cr but enhanced by Pb.Item Effect of root feeding of heavy metals on the leaf concentration of P, K, Ca and Mg in coconut (Cocos nucifera L.)(2007-02-08) Biddappa, C.C.; Khan, H.H.; Joshi, O.P.; Manikandan, P.The effect of supplying various metals viz. Pb, Cd, Al, Bi, Cr, Cu and Ba to the roots of coconut palms on the P, K, Ca and Mg concentration in the leaves of cocnut palms was investigated. The results showed that compared with the control the amount of leaf phosphorus was reduced by all the metals. The K concentration in the leaves was reduced by Al, Cd and Ba but increased by Bi and Cr. Leaf Ca concentration was decreased by Al and Pb treatments and increased by Cd, Cr and Ba. The amount of magnesium in the leaves was low in palms receiving the Al and the Cr but enhanced by Pb.Item Fertilizer Recommendation for Coconut Based on Mitscherlich-Bray Equation(1986-06) Hameed Khan, H.; Biddappa, C.C.; Joshi, O.P.; Manikandan, P.; Gopalasundaram, P.Item Fertilizer recommendation for coconut based on Mitscherlich-Bray equation(2007-02) Hameed Khan, H.; Biddappa, C.C.; Joshi, O.P.; Manikandan, P.; Gopalasundaram, P.Item Influence of Depth and Frequency of Irrigation on the Water Movement and its Depletion by Coconut in a Red Sandy Loam Soil(2007-02) Joshi, O.P.; Manikandan, P.; Khan, H.H.; Gopalasundaram, P.Item Influence of Long Term Cultural Operations on Physical and Water Retention Characters of a Red Sandy Loam Soil(1986-06) Joshi, O.P.; Varghese, P.T.; Nelliat, E.V.; Hameed Khan, H.The effects of long term manurial-cum-cultural practices, imposed since 1919 and modified in 1972, on physical and water retention properties of a red sandy loam soil planted to coconut, were studied. The treatments like forking basins after inorganic fertilization, no tillage and no manuring, and tillage with organic and inorganic fertilization, showed an improvement in water holding capacity, bulk density, estimated porosity and available water capacity over the treatment of tillage alone when tested for their cumulation effect during 1982. More or less a similar trend was observed for water retained at various tensions. However, the treatments like forking basins after inorganic fertilization, no tillage and no manuring and tillage with organic and inorganic fertilization had an edge over other treatments. The data revealed that minimum disturbance of soil by way of forking after inorganic fertilization helped in maintaining better physical environment in basins of coconut palms over other treatments.Item Integrated Nutrient Management in Perennial Based High Density Cropping through System Approach- A Theoretical Consideration(2007-02) Biddappa, C.C.; Hameed Khan, H.; Joshi, O.P.; Manikandan, P.; Bavappa, K.V.A.An effort has been made to propose theoretical models to evaluate integrated nutrient management in a mixed perennial crop stand through a system approach. Soil and crop communities are the system components of the model. Soil nutrient enrichment and nutrient depletion models are suggested. The soil nutrient pool constituting the solution, exchange and solid phases to be enriched by the enriching components are considered under the nutrient enrichment model. Various components of nutrition depletion are identified and used in the depletion model. The difference between enrichment and depletion is expected to give a nutrient balance sheet which could be used profitably in nutrient budgeting of multispace high density cropping system.Item Micronutrient Distribution in the Crowns of Healthy and Root (Wilt) Diseased Palms(2007) Hameed Khan, H.; Biddappa, C.C.; Joshi, O.P.; Robert Cecil, S.