不同施肥措施对稻田土壤氮素矿化的影响

Imazapyr concentration screening at callus differentiation stage and shoot stage of sugarcane

摘要: 采用 PVC 管原位培养连续取样法测定延边地区生长季节内 3 种施肥方式（化肥、化肥与有机肥配施、有机肥）下的稻田土壤氮素矿化、硝化的时间动态及氮素矿化的空间分布格局。结果表明：3 种稻田土壤氮素矿化存在明显的时空变异性。稻田土壤在 8 月份表现出强烈的氮矿化过程，而在 7~8 月份硝化作用较强。 3种施肥方式稻田上层土壤(0~10 cm)的氮净矿（硝）化率显著高于下层(10~20 cm)土壤。 3 种稻田土壤的氨化过程在氮矿化过程中占有重要地位，其上层土壤 NH4+-N 在无机氮中的比例分别为 58.1%~94.4%（CF）、36.9%~93.8%（CF+OF）、23.3%~93.5%（OF）。施用有机肥有利于促进土壤的氮矿化过程。

Abstract: With the callus differentiation and shoot for 4 weeks of sugarcane variety ROC 22 and Yuetang 93- 159 as materials, this paper determined the concentration of imazapyr in callus differentiation stage and shoot stage of the two sugarcane varieties. The results showed that the callus tissue and shoot for 4 weeks of different genotypes of sugarcane had different tolerance to imazapyr. At the callus differentiation stage, the suitable imazapyr concentration for ROC 22 and Yuetang 93-159 was 0.3 滋mol/L. At the shoot stage of differentiation for 4 weeks, the suitable imazapyr concentration for ROC 22 was 0.5 滋mol/L, while was 1.0 滋mol/L for Yuetang 93-159.