k ratio造句

• Effects of na k ratio in brackish water on survival and growth of litopenaeus vannamei
  对凡纳滨对虾成活率和生长的影响
• At the same time , the screening cultivars and densities , and testing the effect of different n , p , k ratios were conducted
  同时进行了品种和密度筛选和不同氮、磷、钾配比效果试验。