Influence of alfalfa residue and different-source biochars on the chemical properties of a saline-sodic soil

Natural Resources Conservation and Research Pub Date : 2018-08-14 DOI:10.24294/NRCR.V1I4.525

Z. Noori, M. Delavar, Y. Safari

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引用次数: 1

Abstract

A pot experiment was done aimed to improve the chemical properties of a saline-sodic soil using individual application of alfalfa residue and two biochars, produced from sugarcane bagasse and walnut shell and their concomitant application with gypsum, aluminum sulfate and mixture of these two chemical amendments. Organic and chemical amendments were added to the soil at the weighting ratio of 2.5% and as the soil gypsum requirement, respectively. After two months of incubation, soil samples were measured for soil pH, electrical conductivity (EC) and sodium adsorption ratio (SAR) and the results were analyzed by SPSS software applying ANOVA. The results showed that organic amendments caused a reduction in soil pH and enhanced soil EC and SAR; whereas addition of gypsum and/or aluminum sulfate with biochars intensified their regulatory effects. It can be concluded that application of walnut-shell biochar with mixture of gypsum and aluminum sulfate to the saline-sodic soils has the best efficiency to reclaim the chemical soil properties. Soil leaching, as a supplementary procedure, however, is necessary to complete the improving effects of organic and/or chemical application to the soil.

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苜蓿渣和不同来源生物炭对盐碱地化学性质的影响

在盆栽试验中，分别施用苜蓿渣和甘蔗甘蔗渣和核桃壳制备的两种生物炭，并与石膏、硫酸铝和这两种化学改良剂混合施用，以改善盐碱地的化学性质。有机改良剂和化学改良剂分别按2.5%的权重比例和土壤石膏需要量添加。孵育2个月后，测定土壤pH、电导率(EC)和钠吸附比(SAR)，并采用SPSS软件进行方差分析。结果表明:有机改剂降低了土壤pH值，提高了土壤EC和SAR;而在生物炭中添加石膏和/或硫酸铝则增强了它们的调节作用。综上所述，在盐碱化土壤中施用核桃壳生物炭与石膏、硫酸铝混合施用对土壤化学性质的恢复效果最好。然而，作为一种补充程序，土壤淋滤是完成有机和/或化学施用对土壤的改善效果所必需的。

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Natural Resources Conservation and Research

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