Feed allowance levels

• 营养水平

Feed allowance levels的用法和样例：

例句

1. Hydroponics was employed to study the effects of different nutritional levels on root vigor and free amino acid composition and content of Astragalus membranaceus seedlings.
   摘要运用水培试验法研究不同营养水平对黄芪幼苗根系活力和游离氨基酸组成及含量的影响。