Effect of Ordered Transplanting and Optimized Broadcasting on Japonica Super Rice Quality

Abstract

Broadcasting rice is a simple cultivation method with high yield and efficiency. The ordered plantation influences on not only the further high yielding but also the rice quality, so it is necessary to research the quality of ordered transplanting rice providing theoretical and practical basis for good quality rice production. Three planting methods including ordered transplanting(OT), optimized broadcasting(OB) and cast transplanting(CT) using dry-raising seedlings in 3-hole, 2-hole, and 1-hole plastic plates were compared with mechanical transplanting(MT) to investigate rice quality characteristics of super rice. The results indicated that brown rice rate(BR), milled rice rate(MR), head milled rice rate(HMR) in different treatments were all as OT OB CT and MT, and 2-hole 3-hole 1-hole, showing that the sparsely ordered transplanting and optimized broadcasting were beneficial for improving rice processing quality. Chalkiness rate(CR), chalkiness size(CS), chalkiness degree(CD) in different treatments showed the trend of OT OB CT and MT, and 2-hole 3-hole 1-hole, the more tillers and larger competition in 2-hole and 3-hole treatments weakened the appearance quality. Gel consistency(GC), peak viscosity, trough viscosity and break-down value in different treatments were OT OB CT and MT. There were no significant changes in amylose content and protein content in different holes treatments, Peak viscosity and breakdown value showed the trend of 2-hole3-hole and 1-hole, and the final viscosity and setback showed 2-hole and 3-hole1-hole. In conclusion, ordered transplanting and optimized broadcasting, especially 2-hole and 3-hole transplanting, improve rice processing, appearance, cooking, eating and nutritional qualities.