播种量对水稻机插秧苗成毯性及素质的影响

Effects of Sowing Rates on Seedling Root Entwining and Seedling Quality of Machine-Transplanted Rice

为探明不同播种量下水稻机插育秧成毯性及秧苗素质各项指标的差异,以甬优12、中浙优1号为试验材料,设置每盘干种35,50,65,80,95,110 g共6个播种量水平,展开试验。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。不同品种各项指标之间存在差异,中浙优1号随着播种量增加,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,大苗比例高,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。综合各指标结果考虑,甬优12和中浙优1号最适播种量分别为65 g/盘及50 g/盘。研究结果对解决杂交稻机插育秧技术问题具有理论意义和实际应用价值。

To investigate the entwining rates,using Zhongzheyou 1 and Yongyou 12 effect of seedling roots and seedling quality of different sowing as the test materials, the effects of sowing rate on entwining effect of seedling roots, seedling quality, and seedling uniformity were studied with 6 levels of sowing rates.The results showed that increasing decreased, the was poor, the The quality of seedling sowing rate could significantly improve the root entwining force, but the seedling quality was weak and the dry matter accumulation reduced.In addition ,the seedling uniformity proportion of weak seedlingse increased.The difference between the two varieties was significant. the seedlings of Zhongzheyou 1 decreased rapidly, and the percentage of weak seedlings increased quickly,while the sowing rate elasticity of Yongyou 12 was relatively larger.The seedling roots of Yongyou 12 entwined when the sowing rate reached 50g each tray, and the seedlings in trays were tidy, the percentage of strong seedlings（Above 15 cm） was high.Although the seedling quality was good,the LAI was low,it means~ the seedlings in trays were few and scattered, so it was difficult for mechanized transplanting.The seedling roots entwined and the seedling quality was better when the sowing rate of Zhongzheyou 1 reached 50 g each tray, and the seedlings in trays were even and intense. In conclusion, taking everything into consideration, the opti- mum sowing rate of Yongyou 12 was 65 g each tray,while Zhongzheyoul was 50 g each tray.