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.

I International Symposium on Vegetables for Processing

I. Cserni, K. Prohászka

https://doi.org/10.17660/ActaHortic.1988.220.41