论文部分内容阅读
油菜在生长发育过程中,需要氮、磷、钾,硼等多种营养元素,如果缺少某一营养元素,就会从叶片
Rape in the process of growth and development, need nitrogen, phosphorus, potassium, boron and other nutrients, if a lack of a nutrient element, it will from leaves