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The Effects of Ammonium Sulphate and other Fertilizer and Inoculation Treatments on Beans (Phaseolus vulgaris)
(1967) Stephens D.
In two experiments on strongly acid ferrallitic Buganda loam soil, bean yields were significantly increased by superphosphate, lime and ammonium sulphate but not by urea, gypsum, molybdate or inoculating with nitrogen-fixing root-nodulating bacteria. Bean roots were weakly nodulated, leaf nitrogen levels were low and it is considered that the response to ammonium Sulphate was due to the extra effectiveness of its nitrogen over that of urea rather than to its sulphur content. Leaf analysis was a guide to the phosphorus status of the plant but gave little information about nitrogen or sulphur status. Although it increased yields, superphosphate depressed germination.