seed grading

Systematic grading distribution of sex for seed plants, gender plasticity and the cause leading to sex reversion are all introduced.

介绍了种子植物性别的可塑性和影响植物性别逆转的原因，比较了裸子植物和被子植物性别类型和繁育系统的异同。

Objective: To study the seed quality of Achyranthes bidentata from different sources and establish a standard of seed quality grading.

目的：分析不同来源牛膝种子质量，初步制定牛膝种子质量分级标准。

Design and Experiment of a Screw for Grading of Lotus Seed

干壳莲子螺杆分级机设计与分级试验

Study on grading black locust seed quality according to new national seed test criterion

新国标刺槐种子检验方法对种子质量分级的影响

Preserve grading in these areas to protect grass seed mixtures planted in the exposed region.

保护种植在开阔地的绿化地带.