Effects of Different Nitrogen Fertilizer Dosages on Yield and Economic Benefit of Lecture in Karst Mountainous Area

In order to optimize nitrogen fertilizer dosage and provide references for high-yield cultivation of lecture, we studied the different nitrogen fertilizer dosages on the yield and economical benefit of lecture in Karst mountainous area in fields. The results showed that, the treatment 1(without nitrogen fertilizer) had lowest yield of 991.7 kg/667 m2. The lecture yield was increased as the amount of nitrogen fertilizer was increased, and the yields of treatment 2(with 70% optimized amount of nitrogen fertilizer), treatment 3(with optimized amount of nitrogen fertilizer) and treatment 4(with 130% optimized amount of nitrogen fertilizer) were 1 245.9, 1 408.4 and 1 579.2 kg/667 m2, in additon, the treatment 4 had highest yield, net income, output-input ratio and utilization rate of nitrogen fertilizer.