Experiment on precision seedling raising and mechanized transplanting of hybrid rice under low sowing rate in double cropping area

According to the agronomic requirements for mechanized transplanting technology for hybrid rice, using Tianyou 998 and Wuyou 308 as test materials, the effects of a seedling tray and sowing rate on entwining effect of seedling roots, seedling quality, and machine-transplanted quality were studied by mechanized precision seedling raising field experiments. The results showed that when the sowing rate of bowl-flat tray nursing seedlings exceeds 65 g/tray, flat tray nursing seedlings exceeds 45 g/tray, and narrow row tray nursing seedlings exceeds 36 g/tray, the entwining effects of seedling roots were suitable for mechanized transplanting by using reliable mechanized precision planting technology, such as the "Field Factory Seedling Precision Sowing Machine for Rice" developed by South China Agricultural University. Variance analysis showed that the effects of seedling tray types on the seedling quality were significant.