Comparisons Of D-Value Method And ~(15)N-Tracing Method On Calculating The Nitrogen Fertilizer Utilization Efficiency Of Flue-Cured Tobacco

摘要

Nitrogen utilization efficiency (NUE) was a hot topic in the study area of crop cultivation, most scholars tented to calculate NUE by D-value method, which could well reflected the total absorption of N nutrient by crops; and on the other hand, the tracing technique could precisely calculated the N content which crops absorbed from N fertilizer. In this study, the flue-cured tobaccos were treated with 2 N levels and 3 water levels, and the D-value method and the tracing method was adopted to calculate the nitrogen utilization efficiency. Results showed that the RD value was more than double the RN value, and there were no relationships between the results calculated by the D-value method and the tracing method, the treatment with higher RN value could not always obtain a higher RD value; besides, water deficiency or excess could both decreased NUE, through affecting the N availability or through the elution of the N nutrient. Taken as the whole, 6g/plant N combined with 800mm was more beneficial for the effective utilization of N fertilization, and which combined with 1000mm was more beneficial for the N accumulation of tobacco plants.