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1993年干旱地区国际农业研究中心（！CARD）进行试验，首次表明锋在生物固氮过程中起限性作用。微生物学家LuisMateron说：只要有充足的氮和磷，每公斤土壤添加元吧的锌能使首猪产量提高。有些品种比其它品种对缺锌更敏感。缺锌不仅影响植物本身，也影响食喂这些植物的家畜。家
The 1993 International Center for Agricultural Research in arid regions (! CARD) conducted experiments that for the first time demonstrated that the frontal plays a limiting role in biological nitrogen fixation. Microbiologist LuisMateron said that as long as there is sufficient nitrogen and phosphorus, adding zinc yuan per kg of soil can increase the yield of the first pig. Some varieties are more sensitive to zinc deficiency than others. Zinc deficiency affects not only the plants themselves but also the animals that feed these plants. Family