Effect of soils and continuous cropping on the growth of sweetpotato Ipomoea batatas

Radziah Othman, . and Rohaya M.S., . (1998) Effect of soils and continuous cropping on the growth of sweetpotato Ipomoea batatas. [Proceedings Paper]

Reduction in yield of sweetpotato is observed when grown continuously on the same soil. This could be due to the allelopathic effect of the plant. A pot experiment was conducted to determine the effect of different soils and continuous cropping on the allelopathy of sweetpotato. Sweetpotato Gendut was planted on three soilssandy loam tailings mineral Bungor series and peat. The plant was grown continuously on the respective soils for two seasons. After each crop 60 days of growth sweetpotato was harvested and dry weights of plant shoots and roots were determined. The second crop was planted on the same soils two weeks later for 60 days. The same rate of soil fertilization and management were applied to both crops. Soils were analysed for chemical and microbiological properties. Results showed that growth of Gendut was significantly affected by soil types and cropping season. Growth of plant in the first crop was higher in mineral soil and sandy loam tailings compared to that in peat. However in the second crop plant growth in the three soils was significantly reduced. Reduction in plant shoots were between 32.6 to 37 and roots between 23.3 to 44.2. There were significantly uptake of nutrients in plant shoots. The uptake of N and K was higher in crop I and P was higher in crop II. Plants grown on mineral soil and peat accumulated more nutrients in the plant shoots compared to those on sandy loam tailings. The concentration of plant nutrients and polyphenolic compound differed significantly between soils. The populations of bacteria and rhizobacteria in soils did not differ significantly between soils. The populations of bacteria and rhizobacteria in soils did not differ significantly. However the fungal population was signifantly high in peat in the first crop. The study suggests that continuous cropping of sweetpotato regardless of soil types reduces the plant growth.

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Abstract

Reduction in yield of sweetpotato is observed when grown continuously on the same soil. This could be due to the allelopathic effect of the plant. A pot experiment was conducted to determine the effect of different soils and continuous cropping on the allelopathy of sweetpotato. Sweetpotato Gendut was planted on three soilssandy loam tailings mineral Bungor series and peat. The plant was grown continuously on the respective soils for two seasons. After each crop 60 days of growth sweetpotato was harvested and dry weights of plant shoots and roots were determined. The second crop was planted on the same soils two weeks later for 60 days. The same rate of soil fertilization and management were applied to both crops. Soils were analysed for chemical and microbiological properties. Results showed that growth of Gendut was significantly affected by soil types and cropping season. Growth of plant in the first crop was higher in mineral soil and sandy loam tailings compared to that in peat. However in the second crop plant growth in the three soils was significantly reduced. Reduction in plant shoots were between 32.6 to 37 and roots between 23.3 to 44.2. There were significantly uptake of nutrients in plant shoots. The uptake of N and K was higher in crop I and P was higher in crop II. Plants grown on mineral soil and peat accumulated more nutrients in the plant shoots compared to those on sandy loam tailings. The concentration of plant nutrients and polyphenolic compound differed significantly between soils. The populations of bacteria and rhizobacteria in soils did not differ significantly between soils. The populations of bacteria and rhizobacteria in soils did not differ significantly. However the fungal population was signifantly high in peat in the first crop. The study suggests that continuous cropping of sweetpotato regardless of soil types reduces the plant growth.

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Item Type:	Proceedings Paper
AGROVOC Term:	SOIL
AGROVOC Term:	SWEET POTATOES
AGROVOC Term:	IPOMOEA BATATAS
AGROVOC Term:	SOIL TYPES
AGROVOC Term:	SOIL STRUCTURE
AGROVOC Term:	ALLELOPATHY
AGROVOC Term:	CHEMICOPHYSICAL PROPERTIES
AGROVOC Term:	FIELD EXPERIMENTATION
AGROVOC Term:	NUTRIENT UPTAKE
AGROVOC Term:	GROWTH
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16329

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