为探究氰氨化钙颗粒肥在湘南水稻生产中的应用效果，在湖南衡阳县开展了大田试验，在总施氮量150 kg/hm2条件下研究了氰氨化钙配施比例（0、20%、40%、60%）对晚稻产量、米质与氮素利用效率的影响。结果表明，配施氰氨化钙颗粒肥对晚稻有增产效果，其中配施40%处理因有效穗数显著增加而增产显著；尿素配施氰氨化钙对稻米品质整体无显著影响，但能显著提升稻米粗蛋白含量，以配施40%处理效果最好；配施40%和60%氰氨化钙可提高湘南晚稻氮素积累量，配施60%条件下显著提高；配施氰氨化钙可提高晚稻氮素利用效率，氮素偏生产力与氮肥农学效率在配施40%条件下最高，而氮肥利用率在配施60%条件下最高；相关分析表明，氰氨化钙配施比例与产量、有效穗数、氮素偏生产力、氮肥农学效率呈显著正相关关系。可见，在施氮150 kg/hm2条件下，配施40%氰氨化钙对提高湘南晚稻产量与氮素利用效率效果较好。

A field experiment was conducted to explore the application effects of calcium cyanamide granular fertilizer in rice production in Hengyang county, Hunan province. The results showed that under the condition of total nitrogen application rate of 150 kg/hm2, the yield of late rice was increased with the application of calcium cyanide granular fertilizer. The yield of 40% combined treatment was significantly increased. The nitrogen accumulation was increased in treatments of combined applying 40%~60% of calcium cyanamide, and significantly increased in 60% treatment. Combined applying of calcium cyanamide could improve nitrogen utilization efficiency, NPFP and ANUE were the highest in 40% treatment, while NUE was the highest in 60% treatment. The correlation analysis showed that the applying proportion of calcium cyanamide were significantly positive correlated with the yield, effective panicles, NPFP and ANUE. So, under the condition of total nitrogen application rate of 150 kg/hm2, combined applying 40% of calcium cyanamide could get higher yield and nitrogen use efficiency of late rice in southern Hunan.