Comparison of the Characteristics and Effects of Commercial Humic Acid Extracted from Cattle and Sheep Manures on Soybean Growth
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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Extraction of humic substances from animal manures can be considered as one of the optimal management solutions for these wastes. This research aimed to identify the characteristics of humic acid from two sources of cattle and sheep manure at two levels of 100 mg and 200 mg and compare their effects with commercial humic acid on the growth of soybeans in a completely random design in greenhouse conditions. Based on the spectrophotometric ratio, E3/E5, the lowest molecular weight was related to humic acid extracted from sheep manure. The infrared spectroscopy results indicated the presence of phenolic hydroxyl, carboxyl, and aromatic ring functional groups in extracted and commercial humic acid. Phenolic OH was abundant in humic acid extracted from sheep manure, and the peak related to aromatic and aliphatic ring was removed in commercial humic acid. The results showed that humic acids extracted from sheep manure in the amount of 200 mg caused 62% increase in the fresh weight of the shoot, 48% in fresh weight of the root; and cattle manure in the amount of 200 mg increased the height of the shoot by 31%. But, the use of commercial humic acid could not influence the mentioned traits. Based on the results of this study, sheep manure can be considered a suitable source for extracting humic acid; and its application to soybean can be recommendable due to its effect on growth indicators, at the rate of 100 mg.
Language:
Persian
Published:
Iranian Journal of Soil Research, Volume:36 Issue: 3, 2022
Pages:
289 to 304
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