渗滤液MBR-NF浓缩液回收含腐植酸水溶肥料对不同种子发芽及幼苗生长的影响

采用水培条件下种子发芽试验方法,研究了所提取的含腐植酸水溶肥料对黄瓜、甘蓝、莴苣和黑麦草4种作物的种子萌发及幼苗早期生长的影响。结果表明:未稀释或低倍数稀释的高浓度含腐植酸水溶肥料对所有4种供试作物种子的萌发均有抑制作用,其中对莴苣种子的胁迫最为明显;而稀释倍数达到20倍以上的含腐植酸水溶肥料对发芽率则不再呈抑制作用。在作物幼苗生长阶段,该含腐植酸水溶肥料对幼苗的长度和重量均表现出高浓度抑制和低浓度促进作用,其中高浓度含腐植酸水溶肥料对供试作物根长的抑制程度高于芽长,对幼苗生长的抑制作用大于发芽率;而对于不同供试作物的生长促进作用,低浓度含腐植酸水溶肥料的最佳稀释倍数则有所不同(在10~25倍之间),在最佳稀释倍数下,含腐植酸水溶肥料对幼苗生长的促进作用顺序为黄瓜最大、甘蓝和莴苣次之、黑麦草最小。

Seed Germination and Seedling Growth as Influenced by Humic Substances-containing Water-soluble Fertilizer Produced from Landfill Leachate-derived Concentrate Generated During Membrane Bio-reactor Coupled with Nanofiltration Process

Research has showed that the concentrate generated during the process of treating landfill leachate by membrane bio-reactor coupled with nanofiltration could be used to produce a humic substances-containing water-soluble fertilizer(HSWF). In this paper, a hydroponic experiment was conducted to investigate the effects of HSWF on seed germination and seedling growth of cucumber, cabbage, lettuce and perennial ryegrass. Results show that HSWF at original or low dilution had significant inhibition effects on seed germination of all crops tested, with lettuce being the most sensitive. However, such inhibition disappeared when the fertilizer was diluted at more than 20 times. The length and weight of all crops were inhibited by high concentrations, but enhanced by low concentrations of HSWF. The fertilizer showed greater inhibition to the root length than shoot length, as well as to seedling growth than seed germination. The optimum concentrations of the fertilizer for promoting crop growth ranged from 10 to 25 time dilution depending on crops. The promoting effect of the fertilizer was cucumber>cabbage and lettuce>perennial ryegrass.