石泉,唐利忠,杨国俊,曹亚娟,易镇邪,周文新.播种量与多效唑喷施时期对湘南早稻产量的影响[J].湖南农业大学学报:自然科学版,2019,45(5):.
播种量与多效唑喷施时期对湘南早稻产量的影响
  
DOI:
中文关键词:  早稻  多效唑  播种量  喷施时期  秧苗素质  产量
英文关键词:early rice  paclobutrazol  seeding rate  spraying mode  seeding quality  yield
基金项目:国家重点研发计划(2017YFD0301500,2018YFD0301005)
作者单位
石泉,唐利忠,杨国俊,曹亚娟,易镇邪,周文新 湖南农业大学农学院湖南 长沙 410128 
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中文摘要:
      以早稻品种中嘉早17为材料,于2017—2018年在湖南衡阳县开展大田试验,研究了多效唑3种喷施时期A1(1叶1心期喷施)、A2(2叶1心期喷施)、A3(1叶1心期与2叶1心期喷施)和4种播种量处理B1(75 g/盘)、B2(90 g/盘)、B3(105 g/盘)、B4(120 g/盘)对早稻产量的影响。结果表明:水稻成苗率、每穴总根数、平均根长、茎基宽和百株干质量随播种量增加而降低;播种量和多效唑喷施时期对秧苗抗氧化酶活性的影响显著,以B3各处理的酶活性较高;较低播种量处理(B1与B2)分蘖速度较快,最终有效穗数随播种量增大而增多;播种量对地上部分干物质积累和叶面积指数影响显著,两者皆以B3处理最高;播种量与多效唑喷施时期对产量及其构成因素均影响显著,播种量处理间以B3处理的有效穗数、每穗粒数、结实率、产量较高,多效唑喷施时期处理间以A2处理产量较高;播种量与多效唑喷施时期对产量的互作效应显著,2017年和2018年分别以A2B3和A1B3产量最高,两年总产量以A1B3处理最高。可见,湘南早稻机插秧播种量以105 g/盘为佳,多效唑以1叶1心期喷施为宜;适宜的播种量与多效唑喷施时期提高了秧苗抗逆能力,促进了物质积累,提高了每穗粒数和千粒质量。
英文摘要:
      To understand the factors of increasing yield in the machine transplanting seedling nursing techniques of early rice in South Hunan province, we conducted field experiments in Hengyang county, Hunan province in 2017-2018. Three spraying periods of paclobutrazol, spraying on 1 leaf 1 heart period (A1), spraying on 2 leaf 1 heart period (A2), spraying on 1 leaf 1 heart period and 2 leaf 1 heart period (A3), and four seeding rates (dry seed), 75 g/plate (B1), 90 g/plate (B2), 105 g/plate (B3) and 120 g/plate (B4) were used in the experiment to explore the effect on yield of a early rice, Zhongjiazao 17. The results showed that seedling rate, total roots number per plant, average root length, stem width and dry matter weight per 100 plant of early rice were increased by the increment of seeding rate. There existed significant effect of seeding rate and spraying period of paclobutrazol on antioxidase activities of seedlings, and those of B3 treatments were higher. Tillering speed of treatments with lower seeding rate was faster, and the effective panicles were increased with the increment of seeding rate. Seeding rate had significant effects of leaf area index and dry matter accumulation of upland parts, and those of B3 treatments were higher. Seeding rate and spraying period of paclobutrazol had significant effects on yield and its components. Within seeding rate treatments, B3 treatment had the higher effective panicles, grains per panicle, seed setting rate and yield, and within treatments of spraying period of paclobutrazol, A2 treatment had the higher yield. There existed significant interaction on yield between seeding rate and spraying period of paclobutrazol, yield of A2B3 and A1B3 was the highest in 2017 and 2018, respectively, and the total yield of two years of A1B3 was the highest. These results showed that the optimal conditions were 105 g/plate for seeding rate, 1 leaf 1 heart period for spraying method. The yield enhancement was due to heighten grains per panicle and seed setting rate, which were probably resulted by improved inverse resistance of seedlings, promoted dry matter accumulation.
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