THE EFFECT OF N SUPPLY ON THE NITRATE, SUGAR AND CAROTENE CONTENT OF CARROTS
The treatment of N160 kg/ha N active agent /with P140 and K360 kg/ha, P2O5, and K2O, basic fertilizers, respectively/ proved superior. Therefore, in carrots quantities of N active agent calculated upon nutrient balance /N320 kg/ha/ seem to be extremely high resulting also in high costs and environment pollution. Tests indicate a positive effect of N on the carotene content. 320 kg N calculated upon balance increased the NO3 content of roots 3–4 fold when compared with treatments of less N-supply. A provocatively high N dose, N640 kg/ha, increased NO3 content far above the allowed level /400 ppm/. Less N doses divided into three parts can be leached easily by irrigation from our sandy soils thus, they do not increase the NO3 content of roots.
Cserni, I. and Prohászka, K. (1988). THE EFFECT OF N SUPPLY ON THE NITRATE, SUGAR AND CAROTENE CONTENT OF CARROTS. Acta Hortic. 220, 303-308