Growth and Nitrogen Fixation of Sesbania cannabina, Crotalaria juncea, and Cassia tora under the Application of Various Forms of Phosphorus
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Green manure legumes are often used to compare biomass production as well as nitrogen-fixing capacity. Mineral deficiency often limits the symbiotic nitrogen fixation of many legumes, thus limiting their productivity despite their high yielding potential(O'Hara et al.1998 ; Flis et al.1993). Leguminous species require large amounts of P for growth, nodulation, and nitrogen fixation. Consequently, they are often unable to grow in acid soils with low available P. The low P availability in tropical acid soils often arises from fixation of P by Al and Fe in soil. Generally, Al and Fe-phosphates are relatively unavailable to plants(McLachlan 1976 ; Ae et al.1990). It has been well documented that legume crops display widely different responses to phosphorus nutrition(Andrew and Robins 1969 ; Tnaka et al.1984 ; Itoh 1987 ; Mappaona et al.1995), and some legumes are able to absorb unavailable P(Ae et al.1990). In soils where P fixation is a major problem, identification of legumes which can take up P from such unavailable forms of P, would be useful for maintaining productivity without further addition of fetrilizer P(McLachlan 1976 ; Sanchez and Salinas 1981). In the current study we investigated the response of Sesbania cannabina, Crotalaria juncea, and Cassia tora to different forms of phosphorus compounds applied to the soil. Preliminary studies showed that these three legumes responded differently to phosphorus fertilization(Mappaona et al.1995), Crotolaria junced showed a remarkable response to P fertilization. S.cannabina showed a weaker response and grew well even at lower levels of P fertilization. On the other hand, Cassia tora showed an intermediate response to P fertilization. The objective of this experiment was to investigate whether these legumes vary in their ability to absorb P from unavailable phosphorus.
- 社団法人日本土壌肥料学会の論文
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関連論文
- Growth and Nitrogen Fixation of Sesbania cannabina, Crotalaria juncea, and Cassia tora under the Application of Various Forms of Phosphorus
- Difference in Phosphorus Response among Tropical Green Manure Legumes Grown under Limed and Unlimed Soil Conditions