关键词: 玉米, 玉米, 自交系, 杂交种, 正反交, 农艺性状, 产量, 杂种优势

Abstract: Fertilizer is one of the main factors that affect crop yield and agricultural carbon emission. This research explored the reasonable dosage of main fertilizers based on reducing the per unit yield of carbon footprint. The author statistically analyzed data of point-survey from four cooperatives of Liuyang through 3 years on 8 kinds of vegetables, which were bitter gourd, cucumber, beans, lettuce, amaranth, eggplant, etc. The specific results were as follows: the optimal amount of N fertilizer, P2O5 fertilizer, K2O fertilizer and manure on seasonal vegetable production was 0, 327.2, 0 and 48936 kg/hm², respectively. At this fertilization level, the per unit yield of carbon footprint reduced by 85.85% meanwhile the yield of vegetables increased by 24.11%. Therefore, the key for developing high efficient and low carbon vegetable planting industry in Liuyang should be reducing the use of N fertilizer and K2O fertilizer, controlling the use of P2O5 fertilizer and increasing the application of manure.