Abstract
The phosphorus (P) uptake and use efficiency in relation to N2 fixation and growth of three provenances of gliricidia (Gliricidia sepium) two cultivars of leucaena (Leucaena leucocephala) and one ofL. diversifolia, all inoculated withRhizobium, were determined at five levels of P application. Increasing the P application rate resulted in a 33% increase in dry matter and total N ofL. diversifolia and an 18% dry matter increase of gliricidia provenance 13/84 over the control without P. Leucaena K8, which did not respond to P application, yielded as well with low P asL. diversifolia at the high P indicating the lower P requirement of cultivar K8. Leucaena cultivar Singapore did not yield well at either low or high P. Correlation analyses showed that differences between species and cultivars/provenances for P uptake per plant were largely related to differences in shoot growth rate and the distribution of P between roots and tops. P use efficiency was not related to dry-matter production. Genetic control of P and dry matter distribution of is probably more important than P availability in the growth media for gliricidia and leucaena provenances or cultivars. Increasing the P application rate significantly increased the number and mass of nodules in leucaena cultivars and gliricidia provenances. Significant increases in the proportion of N derived from atmospheric N2 (% Ndfa) due to low P application (20 mg P kg−1 soil) were observed within leucaena but not for gliricidia provenances. No significant increases in % Ndfa occurred with higher P application rates suggesting that symbiotic N2 fixationper se is stimulated only with low rates of P.
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Sanginga, N. Early growth and N2-fixation of leucaena and gliricidia at different levels of phosphorus application. Fertilizer Research 31, 165–173 (1992). https://doi.org/10.1007/BF01063290
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DOI: https://doi.org/10.1007/BF01063290