Effect of Phosphorus Fertilizer on Growth and Forage Yield of Clitoria ternatea, Lablab purpureus and Vigna trilobata

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Ibrahim, A.S.
Osman, E.K.
Khair, M.A.M.
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Faculty of Agriculture, University of Khartoum, Shambat, Sudan
The effects of phosphorus fertilization on the growth and forage yield of clitoria (Clitoria ternatea), lablab (Lablab purpureus) and phillipesara (Vigna trilobata) were studied at the University of Gezira Farm, Medani, Sudan. The experiments were conducted during January-April and July-October, 1995. Four doses of phosphorus (0, 100, 200 and 300 kg P2O5/ha) were used. Addition of phosphorus significantly increased plant height, number of fruiting branches/plant, fresh weight of leaves and number of branches/plant but not fresh weight of pods/plant of the three crops. In both seasons, fresh forage yield/ha of the three crops increased progressively with increased phosphorus levels applied. Forage yield of July sowing was 4, 1.4 and 6 folds that of January sowing for clitoria, lablab and phillipesara, respectively. Lablab outyielded clitoria by 170% and phillipesara by 244% in January sowing, but in July sowing phillipesara outyielded lablab and clitoria by 13% and 29%, respectively. This finding was confirmed by the highly significant mean square for crop x season interaction effects.
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