摘要
Abstract
To optimize the fertilization regime for water celery production,this experiment was conducted using the cultivar YangzhouChangbaiQin.Three fertilization treatments were established:conventional fertilization(FP),optimized fertilization 1(OPT1),and optimized fertilization 2(OPT2).The FP treatment consisted of basal application of dried chicken manure at 500 kg/667 m2,topdressing with 16-16-16 compound fertilizer at 20 kg/667 m2 at the seedling stage,and two split topdressings of 16-16-16 compound fertilizer at a total of 60 kg/667 m2 during the growing season.For OPT1 and OPT2,the basal fertilizer(commercial organic fertilizer at 500 kg/667 m²),seedling fertilizer(18-8-15 compound fertilizer at 10 kg/667 m2+urea at 5 kg/667 m2),and the first topdressing during the growing season(18-8-15 compound fertilizer at 30 kg/667 m2)were kept identical to each other.At the second topdressing during the growing season,OPT1 received 18-8-15 compound fertilizer at 30 kg/667 m2,while OPT2 received urea at 12 kg/667 m2+potassium chloride at 9 kg/667 m2.The effects of the optimized fertilization regimes on agronomic traits,yield,and quality of water celery were investigated.In addition,nitrogen agronomic efficiency(NAE)and partial factor productivity of phosphorus fertilizer(PFP-P)were calculated.The results showed that the OPT1 treatment achieved the highest water celery plant density and yield,at 728.3 plants/m2 and 6.42 kg/m2,respectively;the OPT2 treatment had a slightly lower yield of 5.59 kg/m2 but performed better in soluble sugar content(13.3 mg/g)and crude protein content(23.88%).Both OPT1 and OPT2 treatments reduced phosphorus fertilizer input(decreases of 48.16%and 56.19%,respectively),with PFP-P increasing by 178.2%and 179.5%compared to the FP treatment,respectively;NAE rates improved by 42.6%and 21.5%,respectively.Overall,the staged fertilization strategy of organic substitution in base fertilizer+phosphorus control during the seedling stage+nitrogen and potassium supplementation in the later stage can achieve high yield,superior quality,and efficient nutrient utilization in water celery.This study provides a reference for precision fertilization and reduced chemical fertilizer application with increased efficiency in water celery.关键词
优化施肥/水芹/有机肥/化肥减量增效Key words
optimized fertilization/water celery/organic fertilizer/reduced chemical fertilizer application with increased efficiency分类
农业科技
