Nitrogen management in the potato crop: characterization of nitrogen nutritional status indices

Abstract

Fertilizer-N recommendation systems have been permanently under discussion au around the world, due to the ecological significance of N and the difficulty in making fertilizer recommendations for this element before for the start of the growing season. Several researchers have suggested alternative action proposals that consist of the preplant application of a small proportion of the total necessary N, with fertilization adjustments at sidedressing time, based on indices of the N nutritional status of the crops. In this abstract results to do with the sensitivity of the petiole nitrate, leaf N and leaf greenness indices in relation to soil N availability are presented.