Effects of nitrogen, phosphorus, potassium and lime applications on production of peas (Pisum sativam L.) In Rosário do Sul, Rio Grande do Sul, Brazil

Abstract

A study was made on the effects of mineral fertilization with N, P, and K and of dolomitic limestone on the production of green peas. Experimental work was carried out in the vears of 1964. 1965 and 1966 in the Municipio de Rosario do Sul, Rio Grande do Sul, located at 30° 15' 27" south latitude and 54° 57' 57" west longitude at an altitude of 130 meters above sea level. Soil analyses were made on samples taken from each experimental site. The following results were obtained: In the absence of liming, applications of 30 and 60 kg/ha of N produced progressive increases in yield of green peas. No effect of nitrogen fertilization was found on treatments receiving 5 ton/ha of dolomitic limestone. Although phosphate fertilizer produced significant increases in yield, there were no significant differences between levels of phosphate applications ranging from 30 to 90 kg/ha of P₂O₅. Response to phosphate fertilization was more pronounced in treatments that received 5 ton/ha of dolomitic limestone than in treatments receiving no lime. Effects of potassium application in these experiments were in some cases negative and in others without effect. Applications of 5 ton/ha of dolomitic limestone increased yield of green peas. The data presently available do not permit conclusions with respect to residual effects of the treatments.