Field Evaluation Study of Mono and Diammonium Phosphate And Superphosphate of Maize (Zea Mays L.) Growth in Five Quebec Soils

Abstract

Performance of mono- and diammonium phosphates and super phosphate with urea or ammonium nitrate on maize (Zea Mays L.} growth was studied in the field in 1971 and 1972. At the rate of 100 kgP 20Sha- l , carriers did not appear to damage seedlings at emergence. Phosphorus application gave significant maize yield increases, with carriers performing alike when averaged over all sites. However, some yield differences among carriers varied with soil type and season. Although differences were not significant, in 1971 diammonium phosphate produced higher mean grain yields on more acid, high phosphorus test soils whereas mono ammonium phosphate and super phosphate-nitrogen mixtures gave higher mean grain yields on less acid, low phosphorus test soils.