“seedling gradation”的概念、定义、翻译、参考文献-科学参考

单词	seedling gradation
释义	seedling gradation Encyclopedia 农学〔苗木培育〕释 seedling gradation苗木分级对需要出圃的苗木按苗木质量标准进行等级划分。目的是使出圃苗达到国家规定标准，保证用壮苗造林，减少造林后的苗木分化现象，提高造林成活率和林木生长量。
随便看	sigma complex sigma discrete family sigma-discrete family sigma electron sigma field sigma-field sigma field of events sigma-field of events sigma-field of sets sigma field prior to tau sigma-field prior to tau sigma-field prior to τ sigma-field strictly prior to τ sigma-finite sigma finite measure sigma-finite measure sigma-finite measure space sigma formyl complex sigma-formyl complex sigma-function sigma-group Sigma hypernucleus sigma hypernucleus Sigma hyperon sigma hyperon

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