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江苏省淮北地区沿废黄河两岸的大面积砂土与砂壤土,历来产量不高.人们认为低产因素主要是有机质和氮素含量低(一般含有机质0.5～0.8%,全氮0.04～0.06%).但其对作物产量的影响程度和不同数量的有机氮无机氮肥配合施用与产量的相关性究竟如何,还有待明确.本文根据在黄泛砂壤土稻麦两熟轮作制中,不同有机肥无机肥配比的定位试验结果,采用多元回归法,对这一问题做了初步探讨.试验在宿迁县农科所进行.试验田0～15厘米土层,pH8.98,有机质1.57%,全氮0.086%,速效磷29.20ppm,速效钾71.80ppm,<0.01毫米物理粘粒11.77,<0.001毫米粘粒2.83.
It is thought that the low-yielding factors are mainly low organic matter and low nitrogen content (usually containing 0.5-0.8% of organic matter and 0.04-0.06% of total nitrogen) along the large area of sand and sandy loam along both sides of the Yellow River in Huaibei, Jiangsu Province. However, it is yet to be clarified whether the relationship between crop yield and crop yield is related to the amount of organic nitrogen.Furthermore, Fertilization ratio of the positioning test results, the use of multiple regression method to do a preliminary study of this issue.The experiment was carried out in Suqian County Agricultural Science.The experimental field 0 ~ 15 cm soil layer, pH8.98, organic matter 1.57%, total nitrogen 0.086 %, Available phosphorus 29.20 ppm, available potassium 71.80 ppm, <0.01 mm physical clay 11.77, <0.001 mm clay 2.83.