Effects of Nitrogen Reduction Combined with Organic Fertilizer on Growth and Physiological Characteristics of Foxtail Millet at Seedling Stage

Liu Yizhou; Qin Ling; Yang Yanbing; Li Feifei; Zhang Huidi; Zhang Mengyuan; Chen Erying; Guan Yan'an

doi:10.14083/j.issn.1001-4942.2025.04.013

Abstract：The experiment adopted a two-factor randomized block design with nitrogen fertilizer and or-ganic fertilizer as the factors.A total of 10 treatments were set with inorganic nitrogen fertilizer as no nitrogen application(0),conventional nitrogen application(150 kg/hm2 of pure nitrogen,CK),15％nitrogen reduc-tion(127.5 kg/hm2)and 30％nitrogen reduction(105 kg/hm2),and two levels of organic fertilizer at 1 500 kg/hm2and 3 000 kg/hm2.The effects of different nitrogen reduction combined with organic fertilizer applica-tion treatments on the growth,development and physiological characteristics of foxtail millet at seedling stage were studied.The results showed that compared with no nitrogen application treatment,each fertilizer treat-ment improved dry matter accumulation,root length,root surface area as well as root volume and activities of leaf nitrogen metabolism enzymes and antioxidant enzymes at seedling stage to varying degrees,among which,15％nitrogen reduction combined with 3 000 kg/hm2 organic fertilizer treatment had the most significant effects.Compared with CK,the dry matter accumulation and root development of foxtail millet in treatment of 1 500 kg/hm2 organic fertilizer under normal nitrogen fertilization were significantly improved,and the activi-ties of antioxidant enzymes and nitrogen metabolic enzymes at seedling stage were also improved to a certain extent;many indexes at seedling stage of 15％and 30％nitrogen reduction treatments were decreased to var-ying degrees,but the growth and development of foxtail millet at seedling stage were improved by different de-grees under the condition of 15％nitrogen reduction combined with different amounts of organic fertilizer,and the best effect occurred when combined with 3 000 kg/hm2 orgnic fertilizer.Under the condition of 30％nitro-gen reduction,there was no significant difference between the treatments combined with different amounts of organic fertilizer and the treatment of only 3 000 kg/hm2 of organic fertilizer.To sum up,under the conditions of this experiment,the treatment of 3 000 kg/hm2 of organic fertilizer combination with 15％nitrogen reduction based on conventional nitrogen application was the optimal fertilization treatment.