[Objective]The objective of this 2-year field experiments were to compare the grian yield under three different mechanical rice-planting methods.[Methods]Using cultivars Chunyou84（japonica hybrid rice） and Zhendao18...
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[Objective]The objective of this 2-year field experiments were to compare the grian yield under three different mechanical rice-planting methods.[Methods]Using cultivars Chunyou84（japonica hybrid rice） and Zhendao18（conventional japonica rice） in 2014,and cultivars Yongyou538（Japonica hybrid rice） and Zhendao18 in 2015 as materials,the growth characteristics,canopy architecture and their effects on grain yield formation for rice transplanted by different methods were *** three treatments were a blanket-type nursery tray（Flat-S treatment）,a bowl-type nursery tray（Pot-S treatment）,and a pot-style/blanket-type nursery tray（Pot-flat-S treatment）.The sowing rate refers to field production across both years and all three *** the Pot-S treatment,each tray was sown with the 2 BD-300 seeding machine（LSP-40 AM;Yameike Inc.,China） contained about 1800 seeds（3 seeds per hole,and 448 holes）.In the Flat-S and Pot-flat-S treatment,each tray was sown with the 2 BZP-800 machine（SR-K800 CN;Kubota Inc.,Japan） contained approximately 2300～2600 seeds（60 g seeds）.For all treatments,the 25-day-old seedlings were machinical transplanted to field with three plants per hill in both ***,plant spacing was 33 cm×12 cm（row lengthx row width） in the Pot-S treatment,and 30 cm×13.2 cm（row lengthx row width） in other *** net photosynthetic rate,leaf area index,dry matter accumulation,and matter translocation from the sheath at flowering to the kernel were significantly higher in the Pot-S treatment than that in other two treatments（p<0.05）.[Results]The Pot-S treatment(9.15-11.81×10～3 kg hm) showed the highest grain yield,followed by the Pot-flat-S treatment(8.84-10.62×10～3 kg hm),and then the Flat-S treatment(8.3-9.78×10～3 kg hm) across three cultivars and two *** relative heights of the1,2,and 3 leaves from the top of the plant were higher in the Pot-S treatment than that in the other two treatments,and there was more space between adjacent leaves at the t
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