关键词: 大蒜（Allium sativum L.）, 化肥减施, 经济性状, 烤烟, 轮作, 土壤养分

Abstract: In order to identify the optimal fertilization amount for garlic （Allium sativum L.） that does not affect garlic yield, has a small impact on tobacco quality, and is environmentally friendly, a field plot experiment was conducted to study the effects of different fertilization rates on the economic traits of garlic and soil nutrients in flue-cured tobacco-garlic rotation, with a reduction of 20%, 40% and 60% on the basis of garlic farmers’ habitual fertilization rates. The results showed that the economic traits of garlic bolt were the best when the fertilizer application rate was reduced by 60%, the economic traits of bulb were the best when the fertilizer application rate was reduced by 40%, and the total output value of garlic was the best when the fertilizer application rate was reduced by 40%. Considering the risk of non-point source pollution of nitrogen and phosphorus, the loss amount and loss rate of nitrogen and phosphorus were significantly reduced under the treatment of 60% reduction of fertilizer application （P<0.05）, but the yield and total output value of garlic bulbs were not significantly reduced under this treatment （P<0.05）, which was the optimal garlic fertilization treatment. Because the contradiction in nitrogen fertilizer management under garlic and flue-cured tobacco rotation could not be resolved, garlic was not suitable as a pre-crop for flue-cured tobacco.

Key words: garlic（Allium sativum L.）, chemical fertilizer reduction, economic traits, flue-cured tobacco, rotation, soil nutrients