苗木分级 meaning in Chinese

seedling gradation

The classification of seedlings is important to ensure the viability of seedlings after transplantation and is acknowledged as a key factor in forestation and environmental improvement
苗木分级是提高造林苗木成活率的一个重要手段，对植树造林、绿化环境有十分重要的意义。
The results showed that the ground diameter ( d ) and the nursery height ( h ) could he regarded as the indexes of the seedlings quality grading of zanthxyhum planisnum var . dingtanenesis
结果表明，地径( d )和苗高( h )对顶坛花椒苗木质量有很好的表达，可以作为苗木分级的质量指标。
Based on numerous papers on automatic seedling classification ( asc ) , the seedling grading theory , traditional grading methods , the background and the proceeding of asc techniques are described
本文在对目前苗木自动分级文献理解和综合的基础上，首先通过对苗木分级技术和分级理论的研究，揭示了自动分级技术的发展背景和理论基础。