There were significant negative correlations between nitrate content and total n, protein n, total p, protein p, protein K of lettuce leaf.
莴笋叶片硝酸盐含量与全氮、蛋白氮、全磷、蛋白磷和蛋白钾含量呈极显著负相关。
2
Ca was positive correlation with n, p, Cu and Zn, but negative correlation with other 4 nutritional elements, especially with K.
钙与氮、磷、铜和锌呈正相关关系，与其他4种元素呈显著负相关关系，尤其是钾。
3
There is the reward decrement relationship between K amounts from organic and inorganic fertilizer and yield of virus-free potato, and the reciprocal effect presents a negative value.