Phosphate response curves of mycorrhizal Hevea brasiliensis in two sterilised soils

Ikram A., . and M. N. Sudin, . and Napi D., . Phosphate response curves of mycorrhizal Hevea brasiliensis in two sterilised soils. pp. 59-68. ISSN 0127-7065

Monoclonal Hevea brasiliensis GT 1 seedlings were grown with or without introduced arbuscular mycorrhizal fungi in steam-sterilised Segamat and Rasau series soils that had been fertilised with Christmas Island phosphate rock and a soluble P source (KH2PO4) at a wide range of applied phosphate levels. After 20 weeks inoculated plants significantly out-yielded uninoculated plants in shoot and root growth despite infection of uninoculated plants by indigenous mycorrhizal fungi. The effectiveness of the phosphorus sources applied on shoot and root yields were not significant but affects mycorrhizal development and phosphorus contents in shoots. Plant growth was poor in steamed Segamat series soil due to release of biologically toxic nutrients even at the higher rates of P applied. Under the conditions of the experiment the main effect of P rates was significant only in Rasau series soil where increased shoot dry matter was obtained when plants were given the insoluble P source at 200 and 400 mg/kg or KH2PO4 at 100 and 200 mg/kg than when P was not supplied.

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Abstract

Monoclonal Hevea brasiliensis GT 1 seedlings were grown with or without introduced arbuscular mycorrhizal fungi in steam-sterilised Segamat and Rasau series soils that had been fertilised with Christmas Island phosphate rock and a soluble P source (KH2PO4) at a wide range of applied phosphate levels. After 20 weeks inoculated plants significantly out-yielded uninoculated plants in shoot and root growth despite infection of uninoculated plants by indigenous mycorrhizal fungi. The effectiveness of the phosphorus sources applied on shoot and root yields were not significant but affects mycorrhizal development and phosphorus contents in shoots. Plant growth was poor in steamed Segamat series soil due to release of biologically toxic nutrients even at the higher rates of P applied. Under the conditions of the experiment the main effect of P rates was significant only in Rasau series soil where increased shoot dry matter was obtained when plants were given the insoluble P source at 200 and 400 mg/kg or KH2PO4 at 100 and 200 mg/kg than when P was not supplied.

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Item Type:	Article
AGROVOC Term:	Mycorrhizae
AGROVOC Term:	Hevea brasiliensis
AGROVOC Term:	Soil sterilization
AGROVOC Term:	Plant nutrition
AGROVOC Term:	Plant pathology
AGROVOC Term:	Fertilizers
AGROVOC Term:	Seedlings
AGROVOC Term:	Planting
AGROVOC Term:	Harvesting
AGROVOC Term:	Clay soils
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 03:57
URI:	http://webagris.upm.edu.my/id/eprint/23359

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