2016年陕西省合阳县玉米季降水量足并且分布均匀,4月中下旬至8月共降雨376.8mm,并且各生育期分布均匀,特别是6~7月玉米生长关键时期降雨288.9 mm,春玉米表现苗齐、苗壮,长势良好,奠定了丰收基础。在选择的4个不同改土剂施用量中:基施改土剂20kg/666.7m~2产量最高,土壤结构改良效果最显著;基施改土剂40kg/666.7m~2产量及土壤结构改良效果次之;其次为基施改土剂5kg/666.7m~2。施用改土剂对土壤容重有影响,但差异不显著,但可提高春玉米株高、穗位高度、茎粗和产量。 In 2016, the precipitation of corn in Heyang County of Shaanxi Province was enough and distributed evenly. Rainfall was 376.8mm between mid-April and August, and the distribution of each growth period was even, especially during the key period of June-July corn growth was 288.9 mm. Spring Miao Qi performance of corn, Miao Zhuang, growing well, laid the foundation for a good harvest. Among the four different application rates of soil conditioner, the yield of 20kg / 666.7m ~ 2 was the highest, and the soil structure was the most significant. The yield of 40kg / 666.7m ~ 2 and soil structure improvement Followed by the foundation soil improvement agent 5kg / 666.7m ~ 2. Soil amendments affected the soil bulk density, but the difference was insignificant, but increased the plant height, ear height, stem diameter and yield of spring maize.