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云南省磷矿资源极丰富,分布也广,除大量磷矿石供工业开采利用外,各地还分布有风化的含磷矿肥,以中部和东部地区埋藏量较大,利用较普遍,群众通称“点荞土”,又叫磷灰土、土骨头、土灰、硝土或岩界等。根据调查在曲靖区宜良县地区,不仅使用荞土的历史较久,而且以往每年有85％的农户利用荞土,并且反映荞土肥效好,增产显著。 荞土属沉积岩,风化程度好,物理性状良好,多呈灰、灰黄、浅黄、灰棕和黄红等色,一般不具结晶构造,疏松易碎,容易捣细。根据部分地区的分析结果,含全磷15—25％,含镁8—12％,含钙约50％,含氟化物很少,因此其全磷易转化为可给态磷,可以直接被作物吸收利用。
In addition to a large number of phosphate rock for industrial exploitation and utilization, Yunnan phosphoric mineral resources are extremely rich and widely distributed. There are also weathered phosphoriferous mineral fertilizers throughout the country, with a large amount of deposits in the central and eastern regions and a more widespread use, “Point buckwheat soil,” also known as phosphorus lime soil, soil bones, soil ash, salt or rock and other industries. According to the survey, in the area of Yiliang County in Qujing District, not only the history of using buckwheat soil is rather long, but 85% of the farmers used buckwheat soil each year in the past, and the yield of buckwheat soil was good and yield was significantly increased. Buckwheat soil is a sedimentary rock, weathering good, good physical properties, mostly ashes, gray, yellow, gray brown and yellow-red color, the general non-crystalline structure, loose and fragile, easily pound thin. According to the analysis result of some regions, it contains 15-25% of total phosphorus, 8-12% of magnesium and 50% of calcium, and contains very little fluoride. Therefore, its total phosphorus is easily converted into available phosphorus and can be directly applied to crops Absorption and utilization.