Effects of Alpinia zerumbet Stem and Leaf Residue Mulching on Weeds,Soil and Growth in Winter Lettuce Fields
The paper aims to select the most suitable amount of the mulch of the stem and leaf residue from Alpinia zerumbet for weed control and lettuce growth.The stems and leaves of A.zerumbet rich in allelopathic substances were selected as materials.In this research,the growth of weeds,lettuce,and changes in soil physicochemical properties were evaluated by covering different amounts of mulch of the stem and leaf residue from A.zerumbet between rows in lettuce fields according to the theory of covering cultivation and the principle of allelopathic grass control.The results showed that with the increase of the stem and leaf residue mulching amount from A.zerumbet,the inhibition on weeds in lettuce fields was enhanced.Among them,compared with the control group,the species,quantity,and diversity of weeds in the lettuce field decreased,and the weed biomass(fresh weight and dry weight)decreased by 87.93％and 90.54％,respectively after mulching with 1200 g/m2 of the stem and leaf residue from A.zerumbet.Meanwhile,lettuce had the highest chlorophyll content and average fresh weight per plant,with the best quality.In addition,the content of soil organic matter,total nitrogen,available nitrogen,and available phosphorus increased.When the coverage was greater than 1600 g/m2,the soil physical and chemical properties showed different changing trends,and the growth of lettuce was inhibited,but the overall quality was improved.Overall,in the production of winter and spring lettuce in Yibin area of Sichuan Province,the use of 1200 g/m2 of the mulch of the stem and leaf residue from A.zerumbet can effectively inhibit the growth of weeds in the field,improve the soil environment,and promote the growth and development of lettuce.
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