土壤与作物2024，Vol.13Issue(3)：348-358,11.DOI:10.11689/sc.2024031701
多次低剂量应用草酸促进芹菜减磷生产
Multiple application of oxalic acid at low rates for promoting phosphorus input-reduced celery production
摘要
Abstract
Aiming at overcoming the shortcomings of single low-dose or high-dose application of oxalic acid in improving soil phosphorus(P)bioavailability during vegetable growth period,a method involving multiple application of oxalic acid through irriga-tion at low rates was adopted to safely enhance soil P bioavailability for promoting P input-reduced greenhouse vegetable production.The effects of multiple low-dose application of oxalic acid on activating soil P and promoting celery production were evaluated by indoor shallow soil(1 cm thick)incubation experiment and greenhouse pot soil(17 cm thick)experiments with and without celery using two greenhouse vegetable soils with available P values respectively as 88.6 and 46.1 mg·kg-1(named as soil A and soil B,respectively).The soil incubation experiment revealed that multiple application of oxalic acid(0.36 g·kg-1 applied 5 times at 10-day intervals)steadily increases the content of dissolved inorganic P(DIP)in either soil.The potted soil experiment without plants revealed that the effect of elevating DIP level in soil A by such multiple low-dose application of oxalic acid concentrated in 0-10 cm soil layer,especially in 0-5 cm soil layer.The results from the potted celery experiment on multiple application of low-rate oxalic acid(0.18 or 0.36 g·kg-1 for 4 times at 10-day intervals 30 days after celery transplanting)showed that,under the condition of reducing P application by 70%in soil A and 54%in soil B,the application of oxalic acid at either rate increases the DIP content in 0-5 cm soil layer of either soil at celery harvest with the increase being significant at either rate in soil A(by 92.0%and 165%)and at the higher-rate in soil B(64.5%),while the lower-rate oxalic application is more effective in promoting celery growth,especially in soil B,significantly increasing celery yield by 20.0%-33.6%(P<0.05).More studies are needed on the performance and risk of multiple low-rate application of oxalic acid in other soil-vegetable systems.关键词
水溶性无机磷/土壤磷素盈余/土壤磷素活化/土壤深度/须根蔬菜/小分子有机酸Key words
dissolved inorganic phosphorus/soil phosphorus surplus/soil phosphorus activation/soil depth/fibrous root vegetables/low molecular weight organic acids分类
农业科技引用本文复制引用
孙项欣,牛明芬,马建,黄斌..多次低剂量应用草酸促进芹菜减磷生产[J].土壤与作物,2024,13(3):348-358,11.基金项目
国家自然科学基金项目(U2106214) （U2106214）
国家重点研发计划项目(2017YFD0800402). （2017YFD0800402）
