硫磺改良对宁夏引黄灌区盐碱土pH及微量元素有效性的影响研究
류광개량대저하인황관구염감토pH급미량원소유효성적영향연구
Research on effect of sulfur application on saline-alkaline soil pH and availability of trace elements in Huanghe River irrigation district in Ningxia
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