Effects of Increasing Solid Soil Amendment on Economic Characters and Black Shank Rate of Flue-cured Tobaccos
Rational use of soil amendments can effectively control the black shank of flue-cured tobacco and increase the economic benefits of crops.We researched the effects of high-efficiency formulations(solid+liquid)and dosages(0,1500,2250 and 3000 kg/hm2)on eco-nomic characters and black shank rate of flue-cured tobaccos(Y87 and K326),screened out the types of effective soil amendments and deter-mined the optimal application amount.Pot experiments showed that compared with liquid amendments,solid amendments could significantly reduce the occurrence of black shank,increase dry matter accumulation and agronomic traits of tobacco leaves,and enhance yield and income.The best treatment was to apply 3000 kg/hm2 solid amendments to Y87 varieties.The field verification test confirmed that different amounts of solid amendments could reduce the disease of the two flue-cured tobacco varieties,improved the dry matter accumulation and economic traits of tobacco leaves.And the most significant effect was under the treatment of 3000 kg/hm2.The diseased plant rate of the two varieties of flue-cured tobacco black shank decreased with the increase of the application amount of soil amendment,which could reduce the diseased plant rate by 12.8%-52.0%(Y87)and 11.9%-51.9%(K326).In addition,the application of soil amendments could significantly increase the dry matter accumulation of flue-cured tobacco,enhance the yield of tobacco leaves by 12.20%-19.76%(Y87),9.93%-18.24%(K326),and increase the output value by 29.17%-37.79%(Y87),12.83%-36.51%(K326),and increase the proportion of high-quality tobacco leaves,and ultimately improve the economic effect.In summary,it was recommended to plant flue-cured tobacco Y87 varieties and to apply 3000 kg/hm2 solid soil amendments to obtain the best benefits.
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