Yield formation characteristics of precision hill–drop drilling early rice

Yield formation characteristics of the early rice planted with precision hill-drop drilling machine were studied by comparing the yields of two-density precision hill-drop drilling with manual broadcasting, manual seedling broadcasting and mechanized transplanting. The results showed that compared with manual broadcasting and mechanized transplanting, the yields of precision hill-drop drilling with two densities increased significantly by 24% -28% and 8.2% -11.6%, respectively, and increased slightly compared with manual seedling broadcasting. The effective panicle number increased by 0.9%－7.0%, 3.5%－9.7%, 7.4%－13.9%, and the harvest index increased by 22.7%－37.2%, 17.2%－26.6%, 0.8%－12.7% respectively, compared with manual broadcasting, manual seeding broadcasting and mechanized transplanting. The seed setting rate increased 8.6－8.73 percentage point compared with manual broadcasting. The panicle weight per hill increased 17.84－18.76 g, 2.15－3.07 g, respectively. The panicle weight per hectare increased 1.225－1.430 t, 0.447－0.628 t, respectively, compared with manual broadcasting and mechanized transplanting.