关键词: 腐植酸, 磷肥, 根系生理, 产量

Abstract: The optimum amount of fertilizer applied to improve the growth and yield of quinoa was explored by applying humic acid at different levels of phosphorus application, which provided the theoretical basis for high-quality cultivation of quinoa. This paper took “Quinoa 1” as experiment material in pot and studied the effects of humic acid on roots physiological indexes and yields of quinoa under different phosphorus levels including control (0 g/kg), low phosphorus (0.1 g/kg), medium phosphorus (0.2 g/kg) and high phosphorus (0.3 g/kg). The results showed that the chlorophyll content, the antioxidant enzyme activity and the yield of quinoa under different phosphorus levels increased first and then decreased with the increasing of phosphorus application, all of which were the best at medium phosphorus level. Applying of humic acid at different phosphorus levels could increase chlorophyll content, root activity, SOD enzyme activity, POD enzyme activity and yield of quinoa. Grain yield and growth rate were higher when applying humic acid under low phosphorus and applying humic acid under medium phosphorus than those under control group, among which grain yield was increased by 88.42% and 100.76% respectively. However, the best agronomic utilization rate and partial productivity of phosphorus fertilizer was attributed after apply humic acid under low phosphorus level. In sum, applying humic acid under low phosphorus level was the most suitable for quinoa growth and could increase its yield and utilization ratio of phosphate fertilizer.

Key words: humic acid, phosphate fertilizer, root physiology, yield