Effects of two organic amendments under nitrogen-equivalent and nitro-gen-reduced return conditions on organic flowering Chinese cabbage pro-ductivity,quality traits,and soil physicochemical properties

XU Jinyu; FU Libo; WANG Wei; YANG Yanxian; CHEN Hua; CHEN Jianfeng; WANG Zhiyuan; WANG Yingxue; YIN Mei

doi:10.16861/j.cnki.zggc.2024.0841

Abstract：This study investigated the effects of two organic materials nitrogen-equivalent and nitrogen-reduced on the yield,quality of organically flowering Chinese cabbage,and soil properties,aimed to explore new fertilizer sources for the production of organic vegetables.A greenhouse experiment was conducted with five treatments and three replicates:T1(100％N from organic fertilizer,control:16 780 kg·hm-2),T2(80％N from organic fertilizer:13 424 kg·hm-2),T3(50％N from Vicia villosa+50％N from organic fertilizer:6229 kg·hm-2 fresh biomass+8390 kg·hm-2 organic fertilizer),T4(80％N from Vicia villosa:9 966.4 kg·hm-2),and T5(100％N from Vicia villosa:12 458 kg·hm-2).After the application of the two organic materials with nitrogen-equivalent return,the agronomic traits,biomass,nitrogen,phosphorus,potassium,moisture,crude fiber,crude protein,soluble sugars,nitrate,chlorophyll,vitamin C,soil pH,organic matter,total nitrogen,hydrolyzable nitrogen,available phosphorus,and available potassium content of the vegetables were measured during the harvest period.The results showed that compared to the organic fertilizer-only treatment,substituting Vicia villosa(hairy vetch)for organic fertilizer reduced soil physicochemical properties to varying degrees:pH decreased by 0.10-0.40,hydro-lyzable nitrogen content declined by 0.67％-5.07％,available phosphorus content diminished by 22.56％-29.63％,and available potassium content reduced by 0.22％-6.00％.However,it increased vegetable biomass by 0.04％-5.60％,and improved plant crude protein content by 5.70％-14.91％,soluble sugar content by 7.56％-23.53％,and chlorophyll con-tent by 3.06％-33.34％,indicating that Vicia villosa(hairy vetch)substitution can enhance vegetable biomass and quality.In this organic vegetable garden,the three treatments of T3(50％Vicia villosa+50％organic fertilizer),T4(80％Vicia villosa),and T5(100％Vicia villosa)had higher biomass and better quality of flowering Chinese cabbage,making them the preferable treatments.When exogenous green manure(Vicia villosa)is sufficient,the 80％Vicia villosa treatment is recommended,as it not only results in higher biomass but also reduces nitrogen input.If exogenous green manure is limit-ed,the 50％Vicia villosa+50％organic fertilizer treatment can be adopted.