Nodulation N2 fixation N accumulation and seed yield of winged bean Psophocarpus tetragonolobus L. DC. under various support systems

M. R. Motior, . and Z. H. Shamsuddin, . and W. O. Wan Mohamad, . and Wong K.C., . (1997) Nodulation N2 fixation N accumulation and seed yield of winged bean Psophocarpus tetragonolobus L. DC. under various support systems. [Proceedings Paper]

A field experiment was carried out to determine the effects of support system 0 1 and 2 m height on nodulation nitrogenase activity accumulation and partitioning of total nitrogen N and seed yield of a local cultivar of winged bean Psophocarpus tetragonolobus L. DC.. Plants grown with 2 m support height produced substantial nodule mass the highest rate of nitrogen fixation increased nitrogen accumulation of the plant and seed yield compared to those grown with 1 m support height and unsupported plants. Nitrogenase activities increased and peaked at the onset of flowering i.e. 10 weeks of growth W10; but declined during the pod formation stage in plants grown with support system. At W;O these were markedly higher 59.50 to 70.05 Ilmol ethylene planr; h-I for supported plant compared with the control plants 35.64 Ilmol ethylene planr1 h-; which showed peak nitrogenase activity prior to flowering. The earlier peaking ofnitrogenase activity could possibly be due to the lack ofphotosynthate resulting in early senescence of control plants. These results indicate that nitrogenase activity is dependent on the supply of photosynthates which corresponded directly with increase in support height. The descending order of total plant nitrogen accumulation at W20 was : plants with 2 m support height 6.30 g N planr; those with 1 m support height 4.06 g N planr1 control plants 2.10 g N planr; reflecting the beneficial effect of support systems on N2 fixation as mentioned earlier. Supported plants contributed significantly higher leafN at the vegetative stage. Consequently seed N was also significantly higher compared with unsupported plants. There was a seven-fold increase in seed yield for plants with 2 m support height compared with unsupported plants. Supports systems had a significant and overriding influence on nodulation nitrogen fixation nitrogen accumulation and seed yield.

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Abstract

A field experiment was carried out to determine the effects of support system 0 1 and 2 m height on nodulation nitrogenase activity accumulation and partitioning of total nitrogen N and seed yield of a local cultivar of winged bean Psophocarpus tetragonolobus L. DC.. Plants grown with 2 m support height produced substantial nodule mass the highest rate of nitrogen fixation increased nitrogen accumulation of the plant and seed yield compared to those grown with 1 m support height and unsupported plants. Nitrogenase activities increased and peaked at the onset of flowering i.e. 10 weeks of growth W10; but declined during the pod formation stage in plants grown with support system. At W;O these were markedly higher 59.50 to 70.05 Ilmol ethylene planr; h-I for supported plant compared with the control plants 35.64 Ilmol ethylene planr1 h-; which showed peak nitrogenase activity prior to flowering. The earlier peaking ofnitrogenase activity could possibly be due to the lack ofphotosynthate resulting in early senescence of control plants. These results indicate that nitrogenase activity is dependent on the supply of photosynthates which corresponded directly with increase in support height. The descending order of total plant nitrogen accumulation at W20 was : plants with 2 m support height 6.30 g N planr; those with 1 m support height 4.06 g N planr1 control plants 2.10 g N planr; reflecting the beneficial effect of support systems on N2 fixation as mentioned earlier. Supported plants contributed significantly higher leafN at the vegetative stage. Consequently seed N was also significantly higher compared with unsupported plants. There was a seven-fold increase in seed yield for plants with 2 m support height compared with unsupported plants. Supports systems had a significant and overriding influence on nodulation nitrogen fixation nitrogen accumulation and seed yield.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. mal S 590.2 S683 1997 Call Number
AGROVOC Term:	Nodulation
AGROVOC Term:	Nitrogen fixation
AGROVOC Term:	Winged bean
AGROVOC Term:	Nitrogenase
AGROVOC Term:	Flowering
AGROVOC Term:	Cultivars
AGROVOC Term:	Ethylene
AGROVOC Term:	Psophocarpus tetragonolobus
AGROVOC Term:	Vegetative period
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:14
URI:	http://webagris.upm.edu.my/id/eprint/12171

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