Potassium Fertilization of Rice and Some Physical, Biological and Economic Indices of Production

M. TODOROV, L. VASILEVA and S. ANGELOVA
Institute of Plant Genetic Resources “K. Malkov”, BG-4122 Sadovo, Bulgaria

Abstract

TODOROV, M., L. VASILEVA and S. ANGELOVA, 2003. Potassium fertilization of rice and some physical, biological and economic indices of production. Bulg. J. Agric. Sci., 9: 679–682

The investigation is carried out on alluvial-meadow soil near Plovdiv. In the background of fertilization with increasing rates nitrogen-phosphorus fertilization the effect of the potassium on formation of physical, biological yield and some economic indices of production are studied. It was found that for the conditions of this kind of soil from the view point of physical yield the rice crop does not need potassium fertilization. Using the increasing rates of nitrogen-phosphorus fertilization has the ability for positive effect on the biological yield. The potassium fertilization is related with decreased profitability of the rice production.

Key words: physical and biological yield, biological value, profitability