玉米种子分级处理对气力式精量排种器播种效果的影响

该研究的宗旨是考察玉米种子分级处理对气力式精量排种器播种效果的影响。将玉米种子按形状和大小分为4级，分别用气吹式和气吸式2种精量排种器进行试验，以考察种子分级对合格、重播、漏播等播种指标的影响。试验表明：气吹式排种器对玉米种子形状和大小变异的适应性较强；对于气吹式排种器而言，在满足播种指标要求前提下，种子分级对其播种合格指数、重播指数影响显著，对其漏播指数和变异系数影响不显著，圆形种子合格率为96%，扁平种子合格率为87.4%，优势明显；而对气吸式排种器而言，分级后对各项质量指标的影响不显著，且出现较多播种不合格情况，说明即使进行种子分级也未能明显改进其播种性能。试验条件下，气吹式精量排种器的播种质量指标优于气吸式精量排种器。

Effects of maize seed grading on sowing quality by pneumatic precision seed-metering device

This paper aims to study the effects of maize seed grading on precise sowing quality. Maize seeds were divided into four levels according to the shape and size. Tests on pneumatic and vacuum precise seeder were carried out to investigate the effects on sowing quality such as up to standard reseeding and miss-seeding etc. The experiment results indicated that the pneumatic seeder is more adaptable to the seed size and shape variation. Maize seed grading obviously affects the qualified index and reseeding index, but affects miss-seeding index and coefficient of variation little on condition that all the indexes reach the sowing quality requirements. The qualified index of round seeds was 96%, which was higher than flat seeds with the qualified index was 87.4%. There was great distinction between them. The sowing quality of vacuum seeder was not so good whether the seed graded or not, and has not significant influence on the whole indexes of it. The experiment also shows that pneumatic seeder has better performance than the vacuum seeder.