作物研究2023，Vol.37Issue(6)：543-550,8.
播种量与壮秧剂对湘南机插晚稻秧苗素质及产量的影响
Effect of Sowing Amount and Seedling Strengthening Agent on Seedlings Quality and Yield of Machine Transplanted Late Rice in Southern Hunan
摘要
Abstract
Improving seedling quality is an effective way to increase rice yield and stress resistance.To clarify the effect of sowing amount and spraying period of seedling strengthening agent on the seedlings quality and yield of machine transplan-ted late rice in southern Hunan,field experiments were carried out in Hengyang county,Hunan province from 2018 to 2019 with HYou 518 as the material under three spraying periods of seedling strengthening agents(A1.1 leaf 1 heart stage;A2.2 leaves 1 heart stage;A3.1 leaf 1 heart stage+2 leaves 1 heart stage)and four sowing rates(dry seeds)(B1.75 g/plate;B2.90 g/plate;B3.105 g/plate;B4.120 g/plant).The results showed that:With the increase of sowing amount,the number and height of seedlings increased,but the rate of seedlings decreased.The total number of roots per hole,ave-rage root length,stem base width,and dry weight of 100 plants decreased.Among spraying period treatments,A1 and A2 treatment had higher seedling quality.As the sowing amount increased,the tillering speed of rice seedlings gradually de-creased,while the highest number of stem tillers and effective panicles gradually increased.The spraying period of strong seedling agent had no significant effect on rice tillering.The sowing amount and spraying period of seedling strengthening a-gent had a significant impact on the dry matter accumulation and LAI of late rice,with A1B2 and A2B2 treatment having higher dry matter accumulation and LAI.The yield of late rice was highest under B2 treatment,which was 7.1%,14.4%,and 9.9%higher than B1,B3 and B4,respectively.Among the spraying period treatments,the yield of A1 treatment was higher.In the interaction treatments,the yield of A1B2 and A2B2 treatment was higher.Correlation analysis showed a sig-nificant positive correlation between yield and seedling rate,total roots per plant,dry matter accumulation,grains per pani-cle,and seed setting rate.In summary,under the conditions of sowing 90 g/plate,spraying paclobutrazol at the stage of 1 leaf 1 heart stage or 2 leaves 1 heart stage,the quality of seedlings can be improved,material accumulation can be promo-ted,and the number of grains per panicle and seed setting rate can be increased,thereby achieving the best yield increase effect.关键词
水稻/播种量/壮秧剂/秧苗素质/产量/湘南Key words
rice/seeding rate/seedling strengthening agent/seedling quality/yield/southern Hunan分类
农业科技引用本文复制引用
荣伍,石泉,袁帅,周文新,易镇邪..播种量与壮秧剂对湘南机插晚稻秧苗素质及产量的影响[J].作物研究,2023,37(6):543-550,8.基金项目
国家重点研发计划重点专项(2018YFD0301005,2017YFD0301501). （2018YFD0301005,2017YFD0301501）
