摘要
Abstract
To clarify the effects of transplanting methods and fertilization strategies on weed control and rice yield in rice-crayfish fields,a field experiment was conducted from 2023 to 2024.2 transplanting methods(film-mulched transplanting and conventional transplanting)were established,combined with different base-to-panicle fertilizer ratios(slow-release blended fertilizer as base at 225-375 kg/hm2,and urea as panicle fertilizer at 0-75 kg/hm2)and weed control regimes(conventional weeding,weeding as needed at later stages,and no weeding).The growth of weeds and rice yield were investigated across all treatments.The results showed that film-mulched transplanting effectively suppressed weed emergence,with weed density at 20 days after transplanting ranged from 0.3 to 0.5 plants/m2,and the plant control efficacy at 40 days after transplanting ranged from 85.6%to 88.6%.Weed competition had a substantial impact on yield formation,with the lowest yields recorded under conventional transplanting+no weeding,at 7 270.5 and 6 387.0 kg/hm2 in the 2 years,respectively.In 2024,under the same fertilization conditions,film-mulched transplanting combined with weeding as needed resulted in a yield increase of 1.1%compared with conventional transplanting combined with conventional weeding.In 2023,under film-mulched conditions,the split fertilization treatment(base fertilizer at 300 kg/hm2+topdressing at 37.5 kg/hm2)increased panicle length by 2.6%,grains per panicle by 1.3%,and grain yield by 9.0%,compared with a single basal application of 300 kg/hm2.This indicated that split fertilization under film mulching can effectively promote panicle development.In summary,film-mulched transplanting can suppress weeds,and under film-mulched conditions,split application of base and topdressing fertilizers can effectively increase grain yield.关键词
稻虾田/水稻/覆膜移栽/施肥策略Key words
rice-crayfish fields/rice/film-mulched transplanting/fertilization strategies分类
农业科技
