黄色成人免费毛片_午夜福利高清视频_一级夜理论片久久_欧美 日韩 国产高清在线_人妻被内射中文字幕_欧美美剧电影大全免费观看全集免费_国产哟交泬泬视频在线播放_國產精品白漿無碼流出_亚洲国产情成人精品青青草原_春药精油按摩高潮不止

News
Current Position:ShanDong ShanWang Biotechnology Co.,Ltd. > News
Class of trace elements in the effect of fertilize
[2014-7-5]

Trace elements is essential for plant growth, but are relatively small amount of elements, mainly iron, copper, zinc, manganese, molybdenum, boron, etc. Trace elements content in crops is less, but because they are within the plant is part of the enzyme or coenzyme, strong specificity, crop growth and development is indispensable and should not substitute. Therefore, when crop lack of any a kind of trace elements, growth will be subdued, resulting in a decline in production and quality, serious precipitously. On the other hand, if too much of these elements, and there will be a phenomenon of poisoning, affecting crop yield and quality, will also cause the occurrence of some of the people and animals endemic diseases.

Online Service
點擊這里給我發(fā)消息