Efficiency of urea in oil palm: yield response and environmental factor

Zin Zawawi Zakaria, . and Ahmad Tarmizi Mohammed, . and Hamdan A. Bakar, . and Khalid Haron, . and Foster H.L., . (1994) Efficiency of urea in oil palm: yield response and environmental factor. [Proceedings Paper]

The efficiency of urea as compared to ammonium sulphate when applied to oil palm was evaluated in field trials comprising a network of twelve fertilizer experiments.The experiments were set up under different soils and climatic conditions in Peninsular and East Malaysia.In this study ammonium sulphate and urea of two granular sizes 2.90 mm and 7.00 mm were applied at different rates and in two ways.The environmental factors that affects the efficiency of urea and ammonium sulphate were determined.The regression method was used to determine partial coefficient of each factor that contribute to the variation in the efficiency.Yield response was significantly higher for both ammonium sulphate and urea when applied by overall broadcast as compared to weeded circle application.However ammonium sulphate treatment was significantly superior to urea as shown by the fresh fruit bunch FFB yield and leaf N concentration.Forestry grade urea applied by overall broadcast gave a significantly higher yield over that obtained by the smaller granular size urea.The environmental factors that contribute significantly to the variation in the efficiency of urea were identified as soil pH soil water regime soil organic matter drought rainfall relative humidity and ground cover characteristics.The result indicate that the larger size granular urea should not be applied in a small area since it is more pH sensitive.Applications of nitrogen fertilizer in the weeded circle appear to be more sensitive to the environmental and soil factors than the overall broadcast method.The result also indicates that in order to increase urea efficiency the timing of application with rainfall needs to be considered.

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Abstract

The efficiency of urea as compared to ammonium sulphate when applied to oil palm was evaluated in field trials comprising a network of twelve fertilizer experiments.The experiments were set up under different soils and climatic conditions in Peninsular and East Malaysia.In this study ammonium sulphate and urea of two granular sizes 2.90 mm and 7.00 mm were applied at different rates and in two ways.The environmental factors that affects the efficiency of urea and ammonium sulphate were determined.The regression method was used to determine partial coefficient of each factor that contribute to the variation in the efficiency.Yield response was significantly higher for both ammonium sulphate and urea when applied by overall broadcast as compared to weeded circle application.However ammonium sulphate treatment was significantly superior to urea as shown by the fresh fruit bunch FFB yield and leaf N concentration.Forestry grade urea applied by overall broadcast gave a significantly higher yield over that obtained by the smaller granular size urea.The environmental factors that contribute significantly to the variation in the efficiency of urea were identified as soil pH soil water regime soil organic matter drought rainfall relative humidity and ground cover characteristics.The result indicate that the larger size granular urea should not be applied in a small area since it is more pH sensitive.Applications of nitrogen fertilizer in the weeded circle appear to be more sensitive to the environmental and soil factors than the overall broadcast method.The result also indicates that in order to increase urea efficiency the timing of application with rainfall needs to be considered.

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Item Type:	Proceedings Paper
Additional Information:	1 ill. 6 tables 6 refs.
AGROVOC Term:	UREA
AGROVOC Term:	OIL PALMS
AGROVOC Term:	YIELDS
AGROVOC Term:	ENVIRONMENTAL FACTORS
AGROVOC Term:	MALAYSIA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16477

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