Effects of Rotation with Tobacco on Soil Nutrients,Yield and Quality of Coix lacryma-jobi
In order to explore the effects of rotation with tobacco on soil nutrients,root morphology,yield and quality of C.lacryma-jobi,the variety Xingren Xiaobaike was used as material,and a completely random-ized block design was used in this experiment.The results showed that compared with continuous cropping of C.lacryma-jobi,rotation with tobacco increased soil organic matter,total phosphorus,alkali-hydrolyzable ni-trogen,available phosphorus and available potassium contents by 11.47％,4.94％,7.49％,26.05％and 129.81％,respectively,and decreased soil total nitrogen and total potassium contents by 5.37％and 1.89％.Among them,there was significant differences in available potassium between treatments(P＜0.05).The total root length,root surface area,root volume,average root diameter,root tip number and root branch number of C.lacryma-jobi under rotation were significantly higher than those under continuous cropping,which were 38.71％,37.54％,34.78％,20.08％,45.62％and 45.85％higher,respectively.The yield of C.lacryma-jobi was 5 484.3 kg/hm2 on average under rotation and increased by 34.80％compared with continuous cropping;the contents of soluble sugar,starch,lysine and crude fat increased by 24.34％,9.77％,17.57％and 6.14％respectively,and the crude protein content decreased by 3.65％.Above all,tobacco-C.lacryma-jobi rotation could improve soil nutrients,significantly increase available potassium content,and promote the growth and development of C.lacryma-jobi roots,thereby improving its yield and quality.
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