The rock-phosphate solubilizing capacity ofPueraria javanica as affected by soil pH, superphosphate priming effect and symbiotic N2 fixation
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WhenPueraria javanica was grown on acid soil in a pot experiment, the legume’s acidifying effect, originating from an uptake pattern in which on an equivalence basis more nutritive cations than-anions were absorbed, was sufficient to mobilize rock phosphate even when added as very insoluble material. In neutral soil, a small quantity of triple superphosphate proved necessary to set into motion a chain of reactions in which the priming action of the TSP enables nodulation to take place followed, in order, by N2 fixation, soil acidification and rock phosphate mobilization.
More attention should be paid in tropical regions to mixed farming systems in which leguminous crops, like Pueraria, produce fodder for livestock whose faeces and urine, when properly collected, can be used for the manufacturing of biogas, after which the residues can serve as manure to food crops. Even when they prove unsuitable for beneficiation, many rock phosphates found in African and Latin American countries can be made useful as fertilizer for leguminous fodder crops.
Key wordsBiogas production Mixed farming N2 fixation Nutrient uptake balance Pueraria javanica Rock phosphate mobilization Soil acidification
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- 1.Aguilar Santelises A 1981 Rock-phosphate mobilization induced by the alkaline uptake pattern of legumes utilizing symbiotically fixed nitrogen. Doct. Dissertation, Agric. Univ. Wageningen, Netherlands.Google Scholar
- 2.Aguilar Santelises A and van Diest A 1981 Rock-phosphate mobilization induced by the alkaline uptake pattern of legumes utilizing symbiotically fixed nitrogen. Plant and Soil 61, 27–42.Google Scholar
- 3.Andrew C S 1976 Effect of calcium, pH and nitrogen on the growth and chemical composition of some tropical and temperate pasture legumes 1. Nodulation and growth. Aust. J. Agric. Res. 27, 611–623.Google Scholar
- 5.Beusichem M L van 1981 Nutrient absorption by pea plants during dinitrogen fixation. 1. Comparison with nitrate nutrition. Neth. J. Agric. Sci. 29, 259–272.Google Scholar
- 6.Blasco L M and Bohorguez A N 1968 Pasture species in the Amazone region (in Colombia). 1. Analysis of some chemical components. Agricultura Tropical 24, 175–177.Google Scholar
- 7.Dirven J G P and Ehrencron V K R 1963 Een bemestingsproef bij kudzu (Pueraria phaseoloides). Surinaamse Landbouw 11, 2, 39–45.Google Scholar
- 8.Febles G and Padilla C 1970 The effect of inoculation and foliar urea on kudzu (Pueraria phaseoloides) and pigeon pea (Cajanus cajan). Revta. Cub. Cienc. Agric. 4, 148–151.Google Scholar
- 9.Loustalot A J and Telford E A 1948 Physiological experiments with tropical kudzu. J. Am. Soc. Agron. 40, 503–511.Google Scholar
- 10.Lowther W L and Loneragan J F 1970 Calcium in the nodulation of legumes. Proc. 11th Int. Grassland Congress, Queensland, Australia, 446–450.Google Scholar
- 11.Munns D N 1965 Soil acidity and growth of a legume. 2. Reactions of Al and P in solution and effects of Al, P, Ca and pH onMedicago sativa andTrifolium subterraneum in solution culture. Aust. J. Agric. Res. 16, 743–755.Google Scholar
- 12.Nyatsanga T and Pierre W H 1973 Effect of nitrogen fixation by legumes on soil acidity. Agron. J. 65, 936–940.Google Scholar
- 13.Rajaratnam J A and Ang Poo Guan 1972 Nitrogen fixation byPueraria phaseoloides in Malaysia. Malay. Agric. J. 1, 2, 92–97.Google Scholar
- 14.Raven J A and Smith F A 1976 Cytoplasmic pH regulation and electrogenic H+ extrusion. Curr. Adv. Plant Sci. 24, 649–660.Google Scholar
- 15.Smith J H and Chandler J V 1961 Tropical kudzu moves into Puerto Rico. Crops and Soils, March, 12–14.Google Scholar
- 16.Swart P H de 1985 Invloeden van bodem-pH, verschillende ruwe fosfaten en het gebruik van geringe hoeveelheden ‘starter-fosfaat’ op het luchtstikstofbindingsproces bijPueraria javanica. Internal Research Report, Dept. of Soil Science and Plant Nutrition, Agric. Univ. Wageningen, Netherlands.Google Scholar