| To better understand the effect of different seed coating agents on hybrid rice seeds and provide references to select the appropriate seed coating agents for hybrid rice seed coating. In this study, three kinds of seed coating agents, i.e, Celest (produced by Switzerland), Miaobosi (produced by Haitech) and new formulation(produced by ourselves) were used to coat the seeds of four hybrid rice combinations, Zhu-liang-you 02, Lu-liangyou 996, V-you 46and Jinyou 207. The effects of different seed coating treatments on the agronomic traits such as germination percentage, seedling rate, seedling quality ect., the yield construction and physiological index for hybrid rice seeds were ttudied by laboratory and yield tests. The main results are as follows:1. The moisture content of coated seeds increased by 0.5-0.61 over the control. Stored at the room temperature after the moisture content in rice seeds lowered to 11%, the seeds' moisture content changed with the season changes, that is, the seed moisture content increased fast in the spring and summer season, while progressively lowered in autumn and winter season, but the moisture content of coated seeds changed significantly slower than that of non-coated seeds. It implied that the coating film on the coated seed surface had played a role to protect air moisture seep into the seeds. After stored for 3 months, the seed germination rate of coated seeds reduced 7.0-11 percentages, and that of not coated seed reduced 11-12 percentages, with the average germination rate less than 80%. It indicated that the storage time of coated hybrid rice seeds was no longer than three months, as the same as other major crops coated seeds. As the storage lasted, the germination rate of coated seeds decreased significantly smaller than that of the uncoated control, it might be concerned with the change of the seed moisture content and the disinfect effects of the seed coating agents. The germination test results showed that the germination rate of the hybrid rice coated seeds decreased 2-6 percentages than that of the controll, it might be due to the seeds of hybrid rice had a hight crack Ying rate is high, the seed coating pharmaceutical directly on embryo, on seed germination inhibition has produced.2. The seeding rate and the seedling percentage of the coated seeds were higher than that of the control, regardless of whether they were bud seed sowing or dry seed sowing, with an increase of 4-19 and 1-20 percentages. But different sowing methods had different effects, in which bud sowing method was better than dry seed sowing for early hybrid rice, for example, zhuliangyou 02 after treated by these 3 seed coating agents, the seeding rate in bud sowing method was 27,24,16 percentages higher than in dry seed sowing method respectively, and the seedling rate in bud sowing method was 27,21,15 percentages higher than in dry seed sowing method respectively; bud sowing method was superior to dry seed sowing for late hybrid rice V-46, but for jinyou 207, the two sowing method had no significant difference to the seeding rate and the seedling percentage. Secondly, under the same sowing methods, the seedling emergence and the seedling rate of the same combination had differences in a certain degree after treated by different seed coating agents. Thirdly, the effects of the same kind of seed coating agents on the seedling emergence and the seedling rate of different combinations had significant difference. From improving the effect of seeding rate and seedLing percentage, Zhuliangyou 02 was suited to "Celest" and " Miaobosi ", Lu liangyou 996 and V-46 were suited to "Celest", and Jinyou 207 use "new formula".3.Three various coating agents were effective in increasing the seedling caudex widths, promoting seedling growth of roots and tillers, biomass accumulation, thus improving the overall quality of seedlings. In improving the quality of various indices, bud sowing method was better than the dry sowing method; because rice seed identity and seed internal differences, active ingredients makes different kinds of coating on the effect of different varieties. To bud seeding mode, strain liangyou 02 selection "Celest" coating better, Lu liangyou 996 selection " Miaobosi " coating seedlings is better, but rice V-46 and Jinyou 207 was not entirely consistent on the the reaction to seed coating agents in the various indexes.4. Three various coating can significantly improve hybrids seedling root activity and plant chlorophyll content and free proline content for enhanced rice seedling quality and resistance to lay a physiological basis. A different kind of coating on the rice varieties in various physiological effect on. Overall, "Celest" ranked the best among the three kinds of seed coating agents," Miaobosi" ranked the second.5. Seed processing to effectively increase the effective spike in hybrid rice, grain number per Spike, seed and grain, ultimately increasing yield. Theoretical yield than controls of enhanced 0.99% 3.58%. Three various coating various combinations in bud seeding mode of production is significantly higher than the corresponding Valley sowing. In the bud seeding mode, the yield of Lu liangyou 996 was maximum in the processing of "Celest", increased by 2.79% than the control; that of Zhuliangyou 02, V-46 and Jinyou 207 wre best in the processing of" Miaobosi", with 2.30%,2.43% and 3.04% more than CK respectively. |
