| In order to explore the effect of different width drilling and hole sowing with plastic film mulching on yield, agronomic traits at flowering stage, occurrence degree of weeds and economic benefits of organic spring wheat in Hetao irrigation area, five different sowing methods were set up:hole sowing with plastic film mulching(FM), 16 cm wide drilling(KF16), 7 cm wide drilling(KF7), 11 cm narrow drilling(ZF11) and 15 cm narrow drilling(ZF15). The differences of agronomic traits at anthesis, grain yield, weed density, dry matter mass and economic benefits of organic wheat were studied under different treatments. The results showed that FM significantly increased the plant height, flag leaf length, flag leaf area, leaf area per plant, and flag leaf SPAD at anthesis of organic wheat; KF16 improved the photosynthetic rate of flag leaf, while KF7 and ZF11 had significantly lower LAI than other treatments. The grain yield of FM, KF16, ZF11, KF7 were increased by 33.0%, 27.2%, 21.5% and 14.9% compared with that of ZF15. The weed density and weed biomass of KF16 and FM were reduced by 75.6%, 92.8% and 73.9%, 81.4%, respectively, and the economic benefit was increased by 7 680.4 yuan·hm-2 and 7 246.7 yuan·hm-2, compared with those of ZF15. Correlation analysis showed that there was a significant negative correlation between weed biomass and organic wheat yield. In summary, wide-width 16 cm and mulching hole sowing are beneficial to the formation of a reasonable population of organic wheat, reduce the density of weeds and weed biomass, and increase the grain yield of organic wheat. In conclusion, hole sowing with plastic film mulching under KF16 can effectively reduce weed density and dry matter mass, promote wheat growth and development, and improve the grain yield of organic wheat. |
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