fertilizer for seed bed是什么意思

用法例句

<Abstrcat>The conceptions of clean water breeding and microalgae water breeding were developed and their characteristics and the precautions to be taken when applied to crab breeding were also discussed in this paper.

阐述了河蟹育苗过程中,清水布苗法和肥水布苗法的概念、特点和注意事项,分析了影响清水布苗法早期状幼体变态率的因素和对策;比较了微绿球藻和海链藻影响Z1变态率的原因,并分析了Z2死亡的原因和预防对策。