| As an important technological way to realize good quality and high yield as well asmechanization cultivation of crops, seeds coating technology has become the key areain crop cultivation researches in China and foreign countries. The field experiment withno-tillage and direct seeding and laboratory experiment with self-pelleted seeds inoilseed rape were conducted in Changsha in 2006-2006. Both conventional oilseed rape(Xiangyou No 15) and hybrid oilseed rape (Xiangzayou No 6) were tested to study thestorage character and biological effects of self-pelleted seeds as well as the properseeding rate of self-pelleted seeds under the no-tillage and direct seeding condition. Theresults are as followed:1. The treatment with self-pelleted seeds of Xiangyou No 15 and Xiangzayou No 6prolonged the remarkably storage time and maintained good seeds vigor. After 4months' storage of self-pelleted seeds, the germination energy, germination percentageand adult seedling rate of Xiangzayou No 6 increased significantly by 24.75%, 30.4%and 21.3% respectively compared with the control. Meanwhile, the fresh weight and dryweight of 100 plants of Xiangyou No 15 increased 5.330 g and 0.347 g compared withthe unpelleted seeds respectively.2. Self-pelleted seeds were kept in plastics bags in the laboratory. The watercontent of both pelleted and unpelleted seeds varied between 4.0%～9.0%, of which iswithin the standard scope for safe storage of oilseed rape seeds. It is accounted for noinfluence of self-pelleting agent on water content of storage seeds.3. In the storage and nursery experiments, the germination energy and seedgermination rate of tested varieties after treatment with WHY-11 decreased by 10%～15% and 5%～10% respectively compared with the control. The possible reason for thiswas in relation to high temperature and low water content in the soil as well as the hardbroken coating agent. Under the field experiment, condition, the coating agent was easybroken by sopping due to high water content in the soil and big difference intemperature between day time and the night. Meanwhile, decomposed pelleting agentmight improve the rhizosphere environment in soils and promote the seedling growth.In consequence, the germination percentage of self-pelleted seeds of tested varieties increased by 11.34% and 19.33% respectively but no significant difference comparedwith the control.4. This experiment showed that self-coating agent could remarkably promoteseedling growth, improve root vigor, increase in dry matter production, enrich thechlorophyll content, enlarger the leaf area and form the better seedling quality.Compared with the control, the chlorophyll content of self-pelleted seeds increased by1.70%～3.07%, the leaf area increased about 0.733-5.933cm~2 per leaf, and fresh weightincreased about 0.273-2.433g per plant. But there are no significant differences betweenthe self-pelleted seeds and the control.5. This experiment showed that the treatment with coating agent could obviouslypromote enzyme activity as peroxidase(POD), catalase, superoxide dismutase(SOD) andothers related with anti-stress, and nitrogen and borne content, of which set a goodphysiological basis for anti-stress of seedlings. Compared with the control, the enzymeactivity of POD and SOD increased about 0.788-0.594 per enzyme unit and980.42-1107.664 per enzyme unit respectively, and the nitrogen content increased by0.192%～0.238% and borne content increased 0.078～0.162 mg/kg.6. As can be seen from the no-tillage and direct seeding experiment, basicseedlings number of the tested varieties after treatment with T2 is 31.26 and 33.38×10~4/hm~2, of which is enough to meet the need for cultivation density in the direct seeding,and reduce the production cost and improve the economic profit.7. In the nursery and transplanting experiment, basic plant number of conventionaloilseed rape after treatment with T1 and T2 is 92.90and58.62×10~4/hm~2, of which couldmeet the need of field transplanting. |
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