Effects Of Different Planting Patterns On Growth And Yield Of Lower-Nodal Ratooning Rice

Three varieties(combinations)-PeiLiangYou288,XinXiangYou80 and XiangZaoXian31 were adopted in this study. Dry-land seedling, wet-land seedling and casting seedling were used in the seedbed management. Dry-land seedling and wet-land seedling were planted by transplanting. Casting seedling was planted by casting. When main crop was reaped ,lhe culm cuttage was set on 10 cm. The main results are as follows:1. Significant differences at the 0.01 level existed in yields of main crop, ratooning crop and whole yield respectively between different treatments. To yield of main crop, XinXiangYou80 under dry-land seedling was highest, XinXiangYou80 under casting seedling was second and PeiLiangYou288 under dry-land seedling was third. To yield of ratooning crop, XinXiangYou80 under casting seedling was highest, XinXiangYou80 under dry-land seedling was second and XinXiangYou80 under wet-land seedling was third. To yield of two crops, XinXiangYou80 under casting seedling was highest, XinXiangYou80 under dry-land seedling and XinXiangYou80 under wet-land seedling were second and third respectively.2. About the choice of main crop, choose hybrid combination with longer growth duration (about 140 days), more leaves, higher LAI, firm culm and more grain number per panicle in main crop, followed by lower-nodal ratooning rice. Increasing tiller-bearing percent of main crop to improve the quality of main crop colony is beneficial to sprouting and growing of lower-nodal axillary buds. Shifting reaping stage to an appropriate earlier time is advantageous to protect the physiology activity of these buds.3.Coefficiency of partial correlation between effective tiller number, total grains number per panicle and seed-setting were significantly different at the 0.05 level. The path analysis showed that influence of effective tiller to yield was biggest, followed by total grains number per panicle and seed-setting percent.4. Compared with main crop, the individual plant was smaller, the leaf number was less, the leaf area was smaller and the leaf photosynthesis duration was shorter in ratooning crop. To PeiLiangYou288 and XinXiangYou80, the 3rd and 4th nodes from top were dominating. To XiangZaoXian31, the 2nd and 3rd nodes were dominating under dry-land seedling and wet-land seedling. But the 3rd and 4th nodes were dominating under casting seedling. The leaf was fewer and smaller from upper-nodal ralooning rice. But the leaf was more and bigger from lower-nodal ratooning rice.5. The nutrient accumulation duration and the seed-setting duration have an identical growth time in ratooning crop. The nutrient accumulation duration of lower-nodal ratooning rice is longer than that of upper-nodal ratooning rice. The quality of differentiation of panicle is better. The shape of panicle is bigger. The total grains number per panicle is more.6. Casting seedling of main crop is advantageous to the axillery buds of lower nodes. These buds will keep the livingness highly and the sprouting property strongly and live in the better small area ecology circumstance when main crop is nearly mature.7. Comparing between the main rice and the ratooning rice, the index level of ratooning rice is greatly declined in the chalkiness percent, chalkiness size of milled rice, lightly reduced in the milled rice length and the ratio of length and width, lightly asended in milled rice percent, gel consistency and amylose content, generally stabilized in brown rice percent, head rice percent, gelatinization temperature and protein content.LI Wei (Crop Cultivation and Farming System) Directed by Professor TU Nailtiei...