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在一般过磷酸钙(下称普通磷肥)中,均含有一定数量的稀土,其含量为0.021—0.025％,接近土壤中稀土元素的含量(0.02％)。而河北省阳原磷矿生产的磷肥(下称稀土磷肥),稀土含量高达0.1665％,约为普通磷肥的7—8倍。1991—1992年我们通过微区试验和大田对比试验,分别以不同产地磷肥为对照,观察了稀土磷肥在小麦上的增产效应。我们分别以河北沙城、河北藁城、云南开远、湖北孝感产磷肥做参比,在亩施五氧化二磷7.5公斤、纯氮8.5公斤的情况下(磷肥全部底施,氮肥底追各半)进行了试验。河北沙城、河北藁城、云南开远和湖北孝感产磷肥的稀土含量分别为
In the general superphosphate (hereinafter referred to as ordinary phosphate fertilizer), contains a certain amount of rare earth, its content is 0.021-0.025%, close to the content of rare earth elements in the soil (0.02%). The Yangyuan phosphate rock production in Hebei Province (hereinafter referred to as rare earth phosphate fertilizer), the rare earth content of up to 0.1665%, about 7-8 times the ordinary phosphate fertilizer. From 1991 to 1992, we compared the yield-increasing effect of rare earth phosphate fertilizer on wheat by micro-area experiment and field comparative test respectively. We respectively Hebei Shacheng, Hebei Tancheng, Yunnan Kaiyuan, Hubei Xiaogan phosphate fertilizer as a reference, in the mu of phosphorus pentoxide 7.5 kg, 8.5 kg of pure nitrogen (phosphorus fertilizer all at the end of application of nitrogen at the end of each half ) Were tested. Hebei Shacheng, Hebei Tancheng, Yunnan Kaiyuan and Hubei Xiaogan phosphate production of rare earth were