The effects of different seedling raising matrixes on seedling quality and yield of mechanical transplanting double cropping rice were studied by taking double cropping early rice varieties of Chuanguang No.1 and Zhongjiazao17 and double cropping late rice varieties Rongyou225 and Hemeizhan as materials.The results showed that among early rice,of M3 (seedling raising fertilizer) leaf age was relatively elder and stem width was larger and of M1 (special rice seedling raising matrix) the 100-seedling dry weight was the lightest.Among late rice,of M3 the leaf age was relatively young and stem width was minor and of M1 the 100-seedling dry weigh was the heaviest.Among early and late rice,M3 was the shortest in seedling height and higher in the panicle rate,while M1 was more dominant in terms of seedling emergence rate,weak seedling rate,biological yield and grain number per panicle.The yield of early rice with M1 and late rice with M3 was higher than that of other matrixes.In 13.33 cm of mechanical transplanting distance between hill,the yield of early rice Chuanguang No.1 and late rice Rongyou225 were separately higher than that of Zhongjiazao17 and Hemeizhan.Moreover,that the yield of rice with 23.33 cm of mechanical transplanting distance between hill was higher than that with 30.00 cm.%以双季早稻春光1号、中嘉早17和双季晚稻荣优225、合美占为材料,研究了不同育秧基质对双季早晚稻机插秧苗素质和产量的影响.结果表明,早稻秧苗以M3(育秧肥)的叶龄和茎基宽较大,M1(水稻专用育秧基质)的百苗干重最轻,而晚稻秧苗以M3的叶龄和茎基宽略小,M1的百苗干重最重.早晚稻以M3的苗高较矮,M3的成穗率较高,M1的出苗率、弱苗率、生物产量和每穗粒数较高.早稻采用M1,晚稻采用M3的产量较高.在13.33 cm机插株距下,早稻产量以中嘉早17高于春光1号,晚稻荣优225高于合美占,且23.33 cm行距机插高于30.00 cm.
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