2. We must take in nutritious food every day. ���DZ���ÿ������Ӫ����ʳ�
3. In this paper, the effect of trace element on the development of nutritious organ and reproductive organ of plants, and apply in agriculture. ���Ľ����������ض�ֲ��Ӫ�����ٺ���ֳ��������������Ӱ���Լ���ũҵ�����е�Ӧ�á�