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Essential nutrients in soil humic and fulvic acids under different land use systems

机译：不同土地利用系统下土壤腐殖液和富瑞酸的必需营养素

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摘要

The present study looks at the degree of affinity among the humic substances and each of the chemical nutrients essential for plant growth, taking into account macronutrients as well as micronutrients. Topsoil samples from pine woodlands were compared with agricultural soils in the central-south region of Buenos Aires, Argentina. Two extractions of fulvic acids (FA) and one of humic acids (HA) were carried out. Soils from beneath pine trees had lower concentrations of Ca, K and Cu than those under agricultural use, but the latter were poorer in P, Fe and B. Ca, Mg, K, P and S showed a high affinity for FA and also for Mn and Zn, whereas Fe and B both had a high affinity for HA. The concentration of nutrients was always higher in the fine fraction than in the whole soil sample, thus validating the study of HA and FA in this fraction.
机译：本研究介绍了腐殖质物质和植物生长所必需的每种化学营养素的亲和力，考虑到Macronuriver以及微量营养素。 从阿根廷布宜诺斯艾利斯市中心南部地区的南部地区的农业土壤比较了来自松树林地的表土样品。 进行了两种富含氟酸（Fa）和一种腐殖酸（HA）的提取物。 来自杉树下面的土壤浓度低于农业用途的CA，K和Cu，但后者在P，Fe和B.Ca，Mg，K，P和S对FA和同时表现出高亲和力 Mn和Zn，而Fe和B均对HA具有高亲和力。 营养物质浓度总是高于整个土壤样品中的细部分，从而验证在该级分中HA和FA的研究。

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