The effective increase in zinc content may be caused by the absorption different between varieties of corn or a few farmers have applying small amounts of zinc or zinc specialfertilizer for crops.
Optimum recipe of special multi element foliage fertilizer for jujube tree is tested and studied by adopting orthogonal trial design.
采用正交试验设计对多元枣树专用叶面肥最佳配方进行了试验研究。
3
The main reasons caused the accumulation of soil salt and nutrients are the special environment condition of greenhouse and the surfeit use of fertilizer.