Liu Xiaoqi, Zhao Xuejiao, Lv Jialong
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
College of Chemistry and Material Science, Shandong Agricultural University, Tai'an, Shandong 271018, China.
ACS Omega. 2023 Feb 10;8(7):6838-6846. doi: 10.1021/acsomega.2c07528. eCollection 2023 Feb 21.
Humic acid (HA) has been widely used in agricultural production processes because it improves soil nutrients and has a growth-promoting effect on plants. Understanding the relationship between the structure and function of HA is the key to efficient utilization of HA in the field of activating soil legacy phosphorus (P) and promoting crop growth. In this work, HA was prepared using lignite as raw materials by the ball milling method. Moreover, a series of HAs with different molecular weights (<10, 10-50, and >50 kDa) were prepared through ultrafiltration membranes. The chemical composition and physical structure characteristics of the prepared HA were tested. The effects of HA with different molecular weights on activating accumulated P in calcareous soil and root promotion of were investigated. Results showed that HAs with different molecular weights have different functional group structures, molecular compositions, and micromorphologies, and the molecular weight of HA can significantly affect the activation performance on soil accumulated P. Moreover, the HA with low molecular weight more easily enhanced the seed germination and growth of than that of raw HA. It is expected that more efficient HA can be prepared in the future for the activation of accumulated P and promoting crop growth.
腐殖酸（HA）因其能改善土壤养分并对植物具有促生长作用，已在农业生产过程中广泛应用。了解腐殖酸的结构与功能之间的关系是在活化土壤残留磷（P）及促进作物生长领域高效利用腐殖酸的关键。在本研究中，以褐煤为原料通过球磨法制备腐殖酸。此外，通过超滤膜制备了一系列不同分子量（<10 kDa、10 - 50 kDa和>50 kDa）的腐殖酸。对所制备腐殖酸的化学组成和物理结构特征进行了测试。研究了不同分子量腐殖酸对石灰性土壤中累积磷的活化作用以及对[具体作物名称缺失]根系生长促进的影响。结果表明，不同分子量的腐殖酸具有不同的官能团结构、分子组成和微观形貌，且腐殖酸的分子量能显著影响其对土壤累积磷的活化性能。此外，低分子量腐殖酸比原始腐殖酸更易促进[具体作物名称缺失]种子萌发和生长。预计未来能够制备出更高效的腐殖酸用于活化累积磷和促进作物生长。
