Effects of Seed Rate on Root Twining Power and Seedling Quality of Machine-transplanted Super Rice  

超级稻机插播种量对秧苗成毯性与秧苗素质的影响（英文）

作　　者：滕飞[1,2] 朱德峰[1] 陈惠哲[1] 蔡雪青[1] 徐一成[1] 

机构地区：[1]中国水稻研究所/水稻生物学国家重点实验室,浙江杭州310006 [2]北京市农业机械试验鉴定推广站,北京100079

出　　处：《Agricultural Science & Technology》2015年第12期2644-2648,2652,共6页农业科学与技术（英文版）

基　　金：Supported by National Rice Industry Technology System(CARS-01-04A);National Key Technology Research and Development Program(2012BAD07B02);Ministry of Science and Technology’s Special Fund for Technology Development and Research of Research Institutes(2013EG134237);National Nonprofit Institute Research Grant of CATAS-TCGRI(2012RG005-3)~~

摘　　要：In order to investigate the effects of seed rate on root twining power and seedling quality of machine-transplanted super rice cultivars, Yongyou 12 and Zhongzheyou No.l, total 6 seed rates were arranged, and the growth characteris- tics, quality and root twining power of machine-transplanted rice seedlings were studied. The results showed that seed rate had great effects on root twining power and qualityof rice seedlings; with the increase of seed rate, the root twining power of rice seedlings was increased, but the quality of rice seedlings was significantly reduced; under the condition of high seed rate, rice seedlings were weak with less accumulate dry matter and nonuniform growth, and the proportion of weak seedlings was higher. When the seed rate of both rice cultivars was reduced by 10 g/tray, the average seedling height was increased by 0.5 cm, leaf age was increased by 0.1, stem base diameter was increased by 0.1 cm, and root number per plant was increased by 0.3. When the seed rate was increased by 10 g/tray, the accumulated dry matter per plant was reduced by 5.1 mg. With the increase of seed rate, the seedling quality of Zhongzheyou No.1 was decreased rapidly, and the proportion of weak seedlings was increased rapidly. However, Yongyou 12 has a larger elasticity in seed rate. When the seed rate reached to 50 g/tray, blanket seedlings of Yongy- ou 12 were nursed with uniform growth and higher quality, but the shoots were sparse with lower leaf area index. However, when the seed rate was up to 50 g/tray, blanket seedlings of Zhongzheyou No.1 were nursed with uniform growth and higher quality, as well as higher-density shoots. From a comprehensive point of view, the optimum seed rates of Yongyou 12 and Zhongzheyou No.1 were 65 and 50 g/tray, respectively.为探明水稻机插不同播种量条件下秧苗成毯及质量的差异,以超级稻品种甬优12和中浙优1号为试验材料,设置6个秧盘播种量,研究秧苗生长特性、秧苗质量及成毯性。研究结果表明,不同播种量对秧苗成毯性及秧苗素质的影响显著,播种量的增加可显著提高秧苗根系盘结力,但其秧苗素质明显下降,秧苗细弱,干物质积累量减少,同时其秧苗整齐度较差,小苗弱苗比例增多。2个品种秧盘播种量每下降10 g,平均秧苗株高提高0.5cm,叶龄增加0.1个,秧苗基部增粗0.1 cm,单株秧苗根数增加0.3根;秧盘播种量每提高10g,平均单株干物质下降5.1 mg。随着播种量的增加,中浙优1号秧苗素质下降较快,小苗比例迅速提高,甬优12播种量弹性则相对较大。甬优12在播种量达到50 g/盘时可实现秧苗成毯,秧苗生长整齐,秧苗个体素质也较优,但其秧盘地上部生长稀疏,叶面积指数较小;而中浙优1号播种量为50 g/盘时,秧苗成毯及秧苗素质各项指标均较优,秧苗生长整齐、紧密。综合各指标研究结果考虑,甬优12和中浙优1号最适播种量分别为65及50 g/盘。

关 键 词：RICE Super rice Mechanical transplanting Seed rate Blanket seedling Seedling quality 

分 类 号：S511[农业科学—作物学]