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Ensaio exploratório de fertilização de cinco leguminosas tropicais em um solo de cerrado

1970; Embrapa Informação Tecnológica; Volume: 5; Issue: 1 Linguagem: Inglês

1678-3921

G. E. de França, Margarida Mesquita Carvalho,

Soil Management and Crop Yield

A greenhouse experiment was carried out to investigate nutrient deficiencies which restrict the development of the legumes: Glycine javanica L. (var. comum), Glycine javanica ( var. tinaroo), Phaseolus atropurpureus D.C. (siratro), Pueraria javanica Benth. (kudzu tropical) and Centrosema pubescens Benth., on a red-latosol fase cerrado. The results obtained led to the following conclusions: a) Individual legume response was different in relation to the deficiencies presented by the cerrado soil; b) The large phosphorus deficiency presented by this soil caused a decrease in nodule weight and in nitrogen and dry matter yields of all legumes; c) Ommission of both potassium and sulfur failed to cause any negative effect on dry matter yield or nitrogen fixation; d) The accentuated micro-element deficiency which seriously affected the tinaroo variety of Glycine java nica, had almost no effect on the siratro variety; e) All legumes were seriously affected by omission of liming, which caused a decrease in both dry matter yield and nitrogen fixation, and increased production of ineffective nodules, especially in kudzu and Centrosema; f) Application of nitrogen fertilizer decreased nodule weight, but increased total nitrogen in the plant. Total nitrogen fixed in the five legumes ranged from 53 to 83% of the nitrogen assimilated by the plants receiving mineral nitrogen.