腐植酸复合肥对油菜氮素利用与后效的影响

Effects of humic acid compound fertilizers on the nitrogen utilization and the following rape

采用微区试验研究不同用量腐植酸复合肥对油菜产量、N素利用与后效的影响。结果表明:施用腐植酸复合肥可提高油菜产量,施肥量与产量呈显著二次曲线关系;后效产量体现了腐植酸复合肥具有缓释、长效、利用率较高的优势;油菜硝酸还原酶活性呈“S”型变化,峰值为施肥600kg／hm2处,而NO3--N含量的峰值为1200kg／hm2;施用腐植酸复合肥可促进油菜对N的吸收,提高N素利用率,改善土壤的N营养。

Effects of different amounts of humic acid(HA) compound fertilizer on the yield and N utilization of rape(Bras-ska campestris L.ssp. chinensis L. Makino)were studied under an experimental condition. The results show that HA compound fertilizer can enhance the yield of rape. The relationship between fertilizer application amount and yield of rape can be described with a quadratic curve regression model. The yield of the rape indicates that HA compound fertilizer is slow-releasing with long efficient period and high-nutrient-utilization ratio. Nitrate reductase activity changes as a shape'S'and its peak is at 600kg/hm2 application amount of HA,but the peak of NO3--N content is at 1200kg/hm2. HA compound fertilizer increases the absorption and utilization ratio of N in rape,and improves the N nutrient in soil.