Browsing by Author "Manikandan, P."
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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 Crown choking disorder of coconut: A case of boron deficiency(2007-02-08) Baranwal, V.K.; Manikandan, P.; Ray, A.K.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coir dust in the same proportion led to lowest production of NH4+-N. During the incubation period NOj -N appeared to be withdrawn from the system in urea blended with unretted coir dust (1:1) treatment, whereas its production was lower in the case of other combinations of urea with retted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 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 Incubation pH on in vivo Nitrate Reductase Activity in Leaves of Two Perennial and Two Annual Tropical Plants(2007-02) Subbaiah, C.C.; Manikandan, P.The effect of assay medium pH on in vivo nitrate reductase (NR) activity of cashew (Anacar-dium occidentale L.) leaves was studied. The enzyme activity continued to increase beyond pH 7.5 up to pH 10 until the leaf discs showed symptoms of damage. Entry of nitrate into the leaf tissue also increased up to pH 9. Higher activities of NR at alkaline pH were also observed in cacao, country bean (Dolichos labial?) and sugarcane leaves. This is perhaps the first time that such a high range is reported as optimal pH for NR in higher plants.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 Nutrient profile in an arecanut-cacao system on a laterite soil(2007-02) Manikandan, P.; Biddappa, C.C.; Mohapatra, A.R.; Hameed Khan, H.; Joshi, O.P.Item Occurrence of Phenols in Soils of Healthy and Yellow Leaf Disease Affected Arecanut Palms(1986) Manikandan, P.; Biddappa, C.C.