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稀土是15种镧系金属元素的总称。其所以叫稀土,是因为它们虽然共生,但在地壳上分散,土壤里稀土氧化物0.01—0.02％。它们的化学性质跟碱土金属相似,所以叫稀土。目前农业生产上使用的稀土主要是镧和铈的化合物,商品名称为“农乐”益植素。“农乐”益植素作为一种复合微肥在农业生产上的推广应用面积逐年增大,适用作物愈来愈广。因其用量少,成本低,增产效果显著而受到人们越来越高的重视。1988年我们在西瓜上作了稀土“农乐”益植素喷施效果试验。试验方法是在西瓜的始花期开始叶面喷洒。试
Rare earth is a generic term for 15 kinds of lanthanide metal elements. It is called rare earth, because although they are symbiotic, but scattered in the crust, the soil rare earth oxide 0.01-0.02%. Their chemical properties with alkaline earth metals similar, so called rare earth. At present, the rare earths used in agricultural production are mainly compounds of lanthanum and cerium under the trade name “Nongle”. “Agronomy” beneficial plant as a compound fertilizer in the agricultural production of the promotion of the application area increases year by year, more and more suitable crops. Because of its less dosage, low cost, significant effect of increasing yield by people more and more attention. In 1988 we made on the watermelon Rare Earth “agricultural music” beneficial effect of spraying Su Zhi effect. The test method is the beginning of watermelon foliar spraying. test