-豆類、西紅柿、土豆和萵苣等。
·銅是保持農(nóng)作物和畜禽健康成長(zhǎng)必須的微量營(yíng)養(yǎng)素。通常,當(dāng)農(nóng)田土壤中的有效銅含量低于2ppmm(1ppmm為百分之一)時(shí),農(nóng)作物就要因缺銅而減產(chǎn),嚴(yán)重時(shí)甚至顆粒不收,或者當(dāng)牧場(chǎng)土壤中有效銅含量低于5ppmm時(shí),牲畜就要患缺銅癥。目前由于集約性的高產(chǎn)作業(yè),在大量使用有化肥中不含銅或含銅量很低,引起土地瘠化,使缺銅日益成為當(dāng)前世界上日益 關(guān)注的問題。為了糾正和防止缺銅,要及時(shí)用鋼鹽補(bǔ)充?梢灾苯蛹尤牖蛘吆透缓土椎姆柿弦黄鸺尤;可以用來(lái)改良土壤長(zhǎng)期起作用,或者每年噴灑在作物的幼苗上。對(duì)于畜禽,除改善牧場(chǎng)外,可以將銅鹽摻入飼料中或采用其它辦法直接注入有缺銅癥狀的牲畜體內(nèi)。 ·硫酸鋼還是豬和雞的助長(zhǎng)劑,可以提高它們的食欲和增進(jìn)食物的轉(zhuǎn)化。在飼料中拌人0.1%的硫酸銅,能夠顯著地促進(jìn)豬和肉雞的增重。
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