Abstract
Ammoniated superphosphates, ordinary superphosphate, triple superphosphate, and diammonium phosphate commercial fertilizers gave similar yield increases with perennial ryegrass (Lolium perenne L.) and Brussels sprouts (Brassica oleracea var. gemmifera DC.) in greenhouse experiments. Comparisons were made with soils very low and moderate in available phosphorus and with established reactions between pH 4.9 and 6.6. Phosphorus was applied either by broadcasting or by banding. Small differences in yields and tissue phosphorus content due to sources of fertilizer phosphorus did not give any correlation with successive crops or soil reaction.As soil pH decreased, yields decreased, but phosphorus content of the tissue increased, on both the fertilized and the unfertilized treatments. Factors other than availability of phosphorus therefore reduced yields on the low-pH soils.
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