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水稻育秧是机插秧技术发展的关键环节。试验表明,秧田期施氮对秧苗生长影响显著,随着施氮量增加,秧苗含氮量显著升高,苗高和地上部干物质增加,在每秧盘施氮量达2~3 g后趋于稳定;秧苗根长和地下部干物质在每盘施氮量2g时最高,呈现先增加后降低趋势;根冠比呈降低趋势,在每盘施氮量超过2 g后下降明显,产量在每盘施氮量2 g时最高,施氮处理显著高于未施氮处理。结合秧苗的各项指标及移栽后产量,基质育秧适宜的纯氮施用量是每盘2 g。
Rice seedling cultivation is the key to the development of seedling technology. The results showed that nitrogen fertilizer had a significant effect on seedling growth at seedling stage. With the increase of nitrogen application rate, the nitrogen content of seedling increased significantly, while the seedling height and aboveground dry matter increased. After nitrogen application reached 2 ~ 3 g The root length and the underground dry matter were the highest at the second nitrogen application rate of 2 g per panicle, and then increased firstly and then decreased; the ratio of root and shoot decreased gradually, and decreased significantly when the nitrogen application rate exceeded 2 g per pan. The yield The highest nitrogen application rate was 2 g per pan, nitrogen treatment was significantly higher than the nitrogen treatment. Combined with various indicators of seedlings and transplanting yield, the appropriate amount of pure nitrogen for substrate seedling cultivation is 2 g per pan.