山东省麦田土壤有效硫含量及分布

在山东省小麦主要产区随机取样,并在20个小麦高产县（市）选超高产田（〉9 759 kg/hm2）和高产田（6 750~7 500 kg/hm2）,采集0~20 cm土层土壤,研究了山东省麦田土壤有效硫含量及分布。结果表明,山东省小麦主要产区的麦田土壤有效硫含量变幅较大,类型多样,缺硫与富硫的土壤并存。鲁西北麦区土壤有效硫含量最高,其次为鲁中、鲁西南麦区,胶东区麦田土壤有效硫含量最低。全省土壤有效硫含量在30~50 mg/kg范围内的麦田最多,占总样本数的31.7%,其次是有效硫含量在15~30 mg/kg和〉100 mg/kg的麦田。有效硫含量〈15 mg/kg及在50~100 mg/kg范围内的麦田分别占总样本数的16.5%和15.8%。20个小麦高产县的超高产田土壤平均有效硫含量显著高于高产田,其变异系数较大,变化范围在18.6~310.8mg/kg。两种产量水平麦田均以土壤有效硫含量在30~50 mg/kg范围内的样本数最多,分别占总样本数的44.4%和58.3%。土壤有效硫含量在15~50 mg/kg范围内的样本数占总样本数的69.4%~83.3%。在超高产田中未检测到土壤有效硫〈15 mg/kg的田块。说明土壤有效硫含量在15~50 mg/kg范围内较适宜小麦生长,适当提高土壤有效硫含量有利于9 759 kg/hm2以上产量的形成。

Content and Distribution of Available Sulfur in Wheat Field Soil in Shandong Province

The soil samples of 0~20 cm soil layer were collected randomly from the main wheat producing areas of Shandong Province,and also from the super-high-yielding(>9 759 kg/hm2) and high-yielding(6 750~7 500 kg/hm2) wheat fields in 20 counties,then the content and distribution of available sulfur in wheat field soil were studied.The results showed that the contents of available sulfur in soil of wheat field in major wheat producing areas of Shandong Province were diverse with greater change amplitude.Sulfur-defi...