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山东省棉田面积大,分布广,主要棉区多为石灰性冲积土。近些年来,随着氮肥施用量的增加,产量要求的提高,棉田施用磷肥的面积逐渐增大。为了摸清我省
Cotton fields in Shandong Province are large in area and widely distributed. Most of the major cotton areas are calcareous alluvial soil. In recent years, with the increase of the amount of nitrogen fertilizer applied and the increase of yield requirements, the area of applying phosphate fertilizer in cotton field gradually increases. In order to find out my province