Effect of Reduced Fertilizer Application on Yield and Soil Nutrients in a Forage/Tobacco Rotation System
[Objective]This study is to explore the effects of crop rotation and reduced fertilizer application on crop yield and soil nutrients as a means of optimizing the amount of fertilizer applied to the forage-tobacco rotation.[Method]The study was conducted from September 2018 to September 2020 using a two-factor completely randomized block group design with three cultivation patterns selected:single-sown continuous crop of flue-cured tobacco(A0),Viciavillosa Rothvar-flue-cured tobacco(A1)and Viciavil-losa Rothvar+oats-flue-cured tobacco(A2);three fertilization methods:pasture and sheep manure 7 500 kg/hm2(B1),tobacco alone with special fertilizer 600 kg/hm2(B2)and pasture with sheep manure 3 750 kg/hm2-tobacco with special fertilizer 300 kg/hm2(B3).[Result]The results showed that in the two years of the experiment,the yield of A2B3 forage grass was the highest,which was increased by 31.62％to 42.07％compared with the treatment with the lowest yield in the same year.After two years of rotation,soil pH decreased by 15.87％,and soil organic matter,total nitrogen,available nitrogen,total phospho-rus,available phosphorus,total potassium and available potassium contents increased by about 4.58％,16.08％,13.78％,23.81％,51.09％,17.92％and 24.78％,respectively.Soil nutrient contents varied greatly.[Conclusion]Proper fertilization of the forage-roasted tobacco rotation(A2B3)not only in-creases the yield of the rotation,but also has a significant effect on improving the quality of the tobacco leaves and improving soil nutrients.However,the recommended fertilizer application rate for A2B3 fol-lowed by roasted tobacco should be 313.05-334.95 kg/hm2 to obtain high roasted tobacco yields.
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