Abstract:

To explore new methods of weeding and improve the weeding effect in organic paddy fields, covering biodegradable film before transplanting and covering straw between rows in 6 periods after transplanting were adopted to eliminate and control the amount of weeds and screen out the best weeding measures and periods in organic paddy fields. The results showed that mulching biodegradable plastic film before transplanting seedlings in organic paddy fields had the best effect on weed control, which not only achieved the purpose of highly effective weed control, but also increased the yield and revenue without affecting the quality of organic rice. During the period of early tillering stage (June 13-18) and late tillering (July 3), row covering straw could effectively prevent Echinochloa crusgalli, Beckmannia syzigachne and Sagittaria trifolia . Covering straw after seedling transplanting or in the beginning tillering period (June 8-10) could improve the control effect of Scirpus juncoides. Covering the biodegradable film before rice transplanting and covering straw between rows from seedling recovering to late tillering stage according to the weed species could not only have a good effect on weed control and removal, but also an obvious effect on yield increase. Covering rice straw between rows can also achieve the effect of returning rice straw to the field and improving soil fertility.

Key words: Organic Rice, Weeding Effect, Degradable Membrane, Straw Mulch, Yield, Quality