Effect of Ordered Transplanting and Optimized Broadcasting on Super High Yield and Photosynthetic Productivity and Exploration of Rice Super High Yield Model

Abstract

Rice seedling broadcasting is a technique of light and simple cultivation method in China and the stable super high yield from using the method relies on the ordered plantation of rice.Three planting methods including ordered transplanting(OT),optimized broadcasting(OB) and cast transplanting(CT) using dry-raising seedlings in plastic plates were compared with mechanical transplanting(MT) to investigate the photosynthetic productivity and matter accumulation characteristics during the formation of super high yield in respect of seedling establishment,tillering,LAI,grain-leaf ratio,photosynthetic potential,matter production,accumulation and translocation in late stages.Using methods of ordered transplanting and optimized broadcasting rice seedlings had the better population quality with earlier seedling establishment at the beginning,and their LAI,leaf area duration,grain-leaf ratio,matter production,accumulation in each growing stage,and net photosynthetic rate and matter translocation in later growing stages were all significantly or very significantly superior to those of cast transplanting.Moreover,in late growing stages,they showed comparatively better population light transmittance and ventilation,slower senescence,and higher matter production and lodging resistance as well.The transplanting hill number for of 3-and 2-hole closely gathered plates were 30–60 percent less than that for single-hole ones,which improved transplanting speed.Although 3-hole seedlings had earlier seedling establishment in early growing stage,2-hole seedlings kept higher matter production and lodging resistance in middle and late growing stages.Eventually,two hole seedings had higher yield than 3-hole seedlings and 1-hole seedlings.With their higher population starting point,earlier seedling establishment,proper matter accumulation in early growing stage as well as higher matter production,accumulation and translocation ability in later growing stages,ordered transplanting and optimized broadcasting methods were capable of leading to the stable super high yielding cultivation of super rice.Two-hole plate transplanting seedlings showed better matter production and obvious growth superiority during the whole growth stage,and 3-hole one also showed growth superiority in some aspects,which could lead us to the conclusion that 2-and 3-hole plate seedlings ordered transplanting are new-typed cultivation patterns of super high yielding in super rice.