PDF(Pubmed)
Abstract：
Increasing pressures on land resources requires increased land use efficiency. Over 900 million ha of sandy soils throughout the world are extensively used for agricultural crop production, most requiring nutrient inputs. Although use of humic substances together with inorganic fertilizer as soil amendments has been introduced, their synergistic effects on plant growth in sandy soils are not well addressed. We assessed the efficacy of a lignite waste derived humic substance on barley (Hordeum vulgare L.) growth, with and without inorganic fertilizer. Ten treatments were applied to sandy soils, comprising sole application of the humic product at four rates (NH1, NH2, NH3, NH4), sole application of fertilizer (F), and their combinations (F + NH1, F + NH2, F + NH3, F + NH4). Synergistic effects of nano humus and fertilizer were more notable than the corresponding sole application, particularly on plant biomass and seed production. Combined application with inorganic fertilizer increased root biomass by 92 % (0.1 g per plant), shoot biomass by 80 % (0.5 g per plant), root length by 24 % (3.6 cm), and seed production by 38 % (5 seeds per head) averagely relative to the untreated control, suggesting a strong synergistic effect. The increased seed production was particularly important from an agricultural perspective. Four application rates of nano humus all showed beneficial effects on barley growth with no significant differences. The most distinct positive effect of the humic product as a sole application was on root growth. Our study confirmed that a lignite waste derived humic product, nano humus, together with fertilizer may be an effective soil amendment to enhance agricultural plant growth in sandy soil regions.
摘要：
土地资源的压力越来越大，需要提高土地利用效率。全世界有超过9亿公顷的沙质土壤被广泛用于农作物生产，最需要营养投入。尽管已经引入了腐殖质和无机肥料作为土壤改良剂的使用，它们对沙质土壤植物生长的协同作用没有得到很好的解决。我们评估了褐煤废物衍生的腐殖质对大麦（HordeumvulgareL.）生长的功效，有和没有无机肥料。对沙质土壤进行了十种处理，包括以四种速率(NH1、NH2、NH3、NH4)单独施用腐殖质产品，单独施用肥料(F)，以及它们的组合(F+NH1,F+NH2,F+NH3,F+NH4)。纳米腐殖质和肥料的协同作用比单独施用更显著。特别是在植物生物量和种子生产上。与无机肥料结合使用可使根系生物量增加92％（每株植物0.1g），芽生物量增加80%(每株植物0.5克)，根长24%（3.6厘米），相对于未处理的对照，种子产量平均为38%(每头5粒种子)，表明有很强的协同效应。从农业角度来看，增加种子产量尤为重要。4种纳米腐殖质的施用量对大麦生长均有有益影响,差异不显著。唯一施用腐殖质产品最明显的积极作用是对根的生长。我们的研究证实，褐煤废物衍生的腐殖质产品，纳米腐殖质，与肥料一起可能是有效的土壤改良剂，可以增强沙质土壤地区的农业植物生长。
