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Soil and leaf nutritional status of cocoa planting on the east and west coasts of Malaya

by Ng Siew Kee; Thamboo, S; Cheah Thean Eng.
Publisher: 1970Subject(s): THEOBROMA CACAO | VALOR NUTRITIVO | SUELOS | ANALISIS DE TEJIDOS | FERTILIDAD DEL SUELO | NUTRIENTES | PROPIEDADES FISICO-QUIMICAS SUELO | INSECTOS DAÑINOS DE LA RAIZ | CULTIVO MIXTO | CLONES AMELONADOS | CLONES DEL ALTO AMAZONAS | MALASIA PENINSULAR | MALASIA | THEOBROMA CACAO | NUTRITIVE VALUE | TISSUE ANALYSIS | SOIL FERTILITY | NUTRIENTS | SOIL CHEMICOPHYSICAL PROPERTIES | MIXED CROPPING | PENINSULAR MALAYSIA | MALAYSIA | THEOBROMA CACAO | VALEUR NUTRITIVE | ANALYSE DE TISSUS | FERTILITE DU SOL | SUBSTANCE NUTRITIVE | PROPRIETE PHYSICOCHIMIQUE DU SOL | CULTURE EN MELANGE | MALAISIE PENINSULAIRE | MALAISIE In: Malaysian Agricultural Journal (Malasia) v. 47(4) p. 390-408Summary: A study on the soil and foliar nutrient status of cocoa planted on contrasting soils in two localities in West Malaysia was conducted in 1963-1965. The objective was to ascertain soil and nutritional factors that might be responsible for the better growth and lower incidence of dieback of Amelonado and Upper Amazon cocoa on the west coast. Results show that the better area had higher cation exchangeable capacity, base saturation and exchangeable bases with magnesium predomination. However, no differences in pH, nitrogen and phosphorus contents were found. In an experimental area on granitic soil, 10 tons per acre of limestone increased pH by about one and a half units to 6.3-6.4 in the first 18 in. of soil. There was considerable variation in leaf nutrient contents over the two year period, especially in the case of calcium. Nitrogen levels were higher in the east coast areas but magnesium levels were lower. Phosphorus, potassium and magnesium appeared to be in adequate supply in all areas. Calcium levels tended to be greater in the west coast plantings but overall, levels were considered insufficient. Manganese, cobalt and nickel contents were higher in the west coast but no shortage of micronutrients was indicated. Aluminium content did not seem excessive. It is thought that the poorer performance of plantings on granitic soils of the east coast may be due to an environmental complex in the root region, involving high soil acidity, low base saturation and exchangeable calcium, but high aluminium in the exchange complex, inhibition by aluminium of uptake of calcium and water by cocoa roots, as well as seasonal moisture stress during drier parts of the year. However, these conditions were most probably associated with environmental and physiological factors such as light intensity and moisture availability. There is good prospect of expansion of cocoa planting under coconuts on marine clay soils in West Malaysia
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A study on the soil and foliar nutrient status of cocoa planted on contrasting soils in two localities in West Malaysia was conducted in 1963-1965. The objective was to ascertain soil and nutritional factors that might be responsible for the better growth and lower incidence of dieback of Amelonado and Upper Amazon cocoa on the west coast. Results show that the better area had higher cation exchangeable capacity, base saturation and exchangeable bases with magnesium predomination. However, no differences in pH, nitrogen and phosphorus contents were found. In an experimental area on granitic soil, 10 tons per acre of limestone increased pH by about one and a half units to 6.3-6.4 in the first 18 in. of soil. There was considerable variation in leaf nutrient contents over the two year period, especially in the case of calcium. Nitrogen levels were higher in the east coast areas but magnesium levels were lower. Phosphorus, potassium and magnesium appeared to be in adequate supply in all areas. Calcium levels tended to be greater in the west coast plantings but overall, levels were considered insufficient. Manganese, cobalt and nickel contents were higher in the west coast but no shortage of micronutrients was indicated. Aluminium content did not seem excessive. It is thought that the poorer performance of plantings on granitic soils of the east coast may be due to an environmental complex in the root region, involving high soil acidity, low base saturation and exchangeable calcium, but high aluminium in the exchange complex, inhibition by aluminium of uptake of calcium and water by cocoa roots, as well as seasonal moisture stress during drier parts of the year. However, these conditions were most probably associated with environmental and physiological factors such as light intensity and moisture availability. There is good prospect of expansion of cocoa planting under coconuts on marine clay soils in West Malaysia

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