不同种衣剂配方对达乌里胡枝子种子发芽和幼苗生长的影响

Effects of different seed coating formulations on seed germination and seedling growth of Lespedeza davurica

在原来的达乌里胡枝子种子包衣配方研究基础上,选用杀菌剂(多菌灵,50%可湿性粉剂)、保水剂(SAP,高吸水性树脂)、填充材料(玉米秸秆粉)等包衣材料对"晋农1号"达乌里胡枝子种子进行包衣,研究不同配方对达乌里胡枝子种子发芽和出苗的影响。试验结果显示,药种比1∶60的多菌灵可以有效解决种子萌发时发霉腐烂、失去种子活力的问题;以不同浓度的SAP作为包衣配方中的保水剂,其中以5%的SAP效果最佳,该浓度下有效地保持住了水分,且各项萌发指标最高,种子活力最强,同时在温室出苗试验中有较高的出苗率、成苗率及出苗数/成苗数,表现出较好的出苗特性;在包衣配方中加入不同粗细程度的玉米秸秆粉,其中细级玉米秸秆粉(过75μm孔径)有较好的萌发状况,并且促进了幼苗生物量的累积。最后将包衣后的种子进行质量检验,研究发现,制成的包衣种子千粒重为裸种的2.3倍,种球直径接近裸种的2倍,并且有较高的含籽率、单籽率和合格率,更适合工业生产和机械播种。

Based on original research on a seed coating formulation for Lespedeza davurica,in this experiment a fungicide(carbendazim,50%wettable powder),water retaining agent(super absorbent polymer,SAP),filling materials(corn stalk powder)and other coating materials were selected as ingredients for further testing and modification of the recipe.The tests were conducted with L.davurica cv."Jinnong No.1"and studied the effects of different formulations on seed germination and seedling growth of L.davurica.The results showed that carbendazim to seed ratio 1∶60 effectively solved the problems with seed decay and inactivation during seed germination.SAP at a range of concentrations was used as a water-retaining agent in the coating formulation,and 5%SAP was found to provide optimum efficacy.At this concentration of SAP,water was effectively held,and the seed vigor was the strongest with the highest germination index.In addition,5%SAP also resulted in a higher emergence rate and seedling growth rates in a greenhouse emergence test,indicating better seedling vigour.Adding corn stalk powder to the coating formulation was also beneficial.A range of powders of different fineness were tested.Among these,fine corn stalk powder(able to pass a 75μm sieve)resulted in a better germination status then the others tested and enhanced seedling biomass accumulation.The 1000-seed weight of the coated seeds was 2.3 times that of the naked seeds,and the coated seed diameter was close to 2 times that of the naked seeds.The tested seed coating formulation was therefore suitable for industrial production and mechanical seeding.