秧龄和播种方式对杂交稻秧苗素质、机插质量及产量的影响OA

To explore the effects of the seedling age and sowing method on the seedling quality,mechanical transplanting quality,and yield of hybrid rice in southern Guangxi,this study used Changliangyou 8 as the test variety,and set 3 seedling age treatments(30,35,and 40 days)and 2 sowing methods[precision drill sowing(PDS)and conventional broadcast sowing(CBS)].The effects of different treatments on rice seedling emergence rate,seedling uniformity,seedling quality,mechanical transplanting quality,number of population peak tillers,panicle-bearing tiller rate,uniformity of the number of effective panicles,dry matter accumulation,yield and yield components were analyzed.The results showed that moderately extending the seedling age to 35 days was beneficial to improving the seedling emergence rate,seedling uniformity,and seedling quality,reducing the missed transplanting rate,increasing the proportions of hills with 2～3 seedlings and 2～4 seedlings under mechanical transplanting conditions and the uniformity of the number of mechanically transplanted seedlings,maintaining a large number of population peak tillers and high uniformity of the number of effective panicles,and thereby stabilizing the yield.Under the 3 seedling age treatments,compared with CBS,PDS significantly improved the seedling uniformity,root coiling force,uniformity of the number of mechanically transplanted seedlings,proportions of hills with 2～3 seedlings and 2～4 seedlings under mechanical transplanting conditions,and biomass yield,while significantly reducing the missed transplanting rate.By significantly increasing the number of population peak tillers and uniformity of the number of effective panicles,PDS further significantly increased the yield.In conclusion,in the hybrid rice production of southern Guangxi,choosing a 35-day seedling age and adopting PDS is conducive to improving seedling quality,mechanical transplanting quality,and yield of hybrid rice.