氮,钾肥对烤烟生长前期营养元素吸收的影响

EFFECT OF NITROGEN AND POTASSIUM FERTILIZERS ON THE NUTRIENT ELEMENTS ABSORBED BY FLUE-CURED TOBACCO PLANT AT EARLY STAGE

A pot experiment and plant analysis with the Quadratic Saturate D-Supertative designwere conducted to study the influences of nitrogen and potassium fertilizers on the nutrientelements (N, P, K. Ca. Mg etc) absorbed by flue-cured tobacco plants at early growthstage. The results are as follows: 1. With the increase in the amount of nitrogen fertilizer, the content of nitrogen in to-bacco plants increased. It was benefitial to vegetative growth and dry matter accumulationin tobacco plants at early stage. 2. With the similar amount of phosphate fertilizer applied, the phosphorus content intobacco plants had no significant change. 3. In the treatment of applying nitrogen fertilizer only, the content of potassium wascomparatively low. The content of potassium increased in flue-cured tobacco plants at theearly stage when the nitrogen and phosphate fertilizers applied simultaneously withpotassium fertilizer. 4. Applying potassium fertilizer with nitrogen fertilizer decreased the contents of cal-cium and magnesium, and increased potassium, K/Ca and K/Ca+Mg ratios, which werebenefitial to improve the tobacco leaf quality. The experiment showed that the N:K=1:3 was the best ratio.