Response of Maize Roots to Different Additive Amounts of Weathered Coal Humic Acids
ZHOU LiPing, YUAN Liang, ZHAO BingQiang,, LI YanTing, LIN ZhiAnInstitute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture and Rural Affairs, Beijing 100081
Abstract 【Objective】 Weathered coal humic acid possesses abundant reserves in China, which has multiple active functional groups. The response of roots to humic acid, which acts as a humic acid acting on the first contact organ of plant, is the initial motive force to promote plant growth. Hence researching the effect of humic acid on the growth and development of maize roots is of significance for crops’ production increase and quality improvement, and can provide a theoretical basis for the effective utilization of weathered coal resource of China. 【Method】 Zhengdan958 maize cultivar was used as the tested cultivar, and Hogland nutrient solution hydroponics was adopted in this experiment. When maize seedlings grew to two leaves and one terminal bud, they were moved to the hydroponic basin for one day for readaption time. Then, the effect of applying different concentrations of humic acid (0, 5, 10, 15, and 20 mg C·L -1) on the growth of maize biomass, root-shoot ratio, root systematic architecture and root nutrient were studied. 【Result】 (1) Humic acids could significantly increase the root dry weight, shoot dry weight, root-shoot ratio, root activity, and root TTC reducing amount of maize roots. Compared with the control treatment (0 humic acid), the average value of the above indicators with humic acid treatment increased by 42.31%, 19.33%, 18.18%, 46.54%, and 81.01%, respectively. (2) Humic acid could improve the root morphology of maize roots by increasing root length, root number, root volume, root surface area, and average diameter of the maize roots. Compared with the control, the average value of the total root length, total root number, root volume, root surface area and average diameter of maize with humic acid treatment increased by 13.51%, 16.74%, 69.62%, 14.68%, and 49.28%, respectively. (3) The addition of humic acid increased the number of axial roots, length of axial roots and number of lateral roots in maize roots. The average value above of maize roots with the addition of humic acids increased by 16.28%, 21.65% and 16.80%, respectively, compared with the control treatments. (4) The promoting effect of humic acid on the growth of maize roots showed the tread of first increase and then decrease with the increasing additive amount of humic acid. When the medium concentration was 10 mg C/L, the promotion effect on maize roots was the most significant. Compared with the control, the root dry weight and root activity of maize roots increased by 69.36% and 69.07%, respectively. (5) The addition of humic acids (10 mg C·L -1) could increase the content of carbohydrates, lipids, proteins, peptides, amino acids, and nucleic acids in maize roots. 【Conclusion】 The addition of humic acid could significantly increase the biomass, root activity and root-shoot ratio of maize. In addition, it could also improve the root architecture of the maize and the content of main chemical components in maize roots. The medium concentration (10 mg C·L -1) of humic acid had the most significant effect on the promotion of maize roots. Keywords:humic acid;maize;root;weathered coal;additive amount
PDF (487KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 周丽平, 袁亮, 赵秉强, 李燕婷, 林治安. 不同用量风化煤腐殖酸对玉米根系的影响[J]. 中国农业科学, 2019, 52(2): 285-292 doi:10.3864/j.issn.0578-1752.2019.02.008 ZHOU LiPing, YUAN Liang, ZHAO BingQiang, LI YanTing, LIN ZhiAn. Response of Maize Roots to Different Additive Amounts of Weathered Coal Humic Acids[J]. Scientia Acricultura Sinica, 2019, 52(2): 285-292 doi:10.3864/j.issn.0578-1752.2019.02.008
供试夏玉米品种为郑单958(Zea may L.)。供试风化煤来自内蒙古棋盘井煤矿(东经107°12'E,北纬 39°21'N,内蒙古自治区鄂尔多斯市),腐殖酸是采用IHSS标准方法从风化煤中提取[13],提取率为50.40%。供试腐殖酸的碳、氢、氧和氮含量分别为47.00%、4.89%、1.04%和33.56%。
Table 1 表1 表1腐殖酸对玉米干物质量的影响 Table 1Effects of humic acids on maize dry matter weight
处理 Treatment
器官 Organs
总重 Total (g)
根冠比 Root-shoot ratio
根Root (g)
地上部Shoot (g)
CK
0.26±0.02 c
1.19±0.14 b
1.45±0.14 c
0.22±0.03 a
HA1
0.31±0.05 bc
1.36±0.14 ab
1.67±0.16 bc
0.23±0.04 a
HA2
0.44±0.04 a
1.58±0.15 a
2.02±0.17 a
0.28±0.03 a
HA3
0.36±0.04 b
1.39±0.14 ab
1.74±0.15 b
0.26±0.04 a
HA4
0.38±0.04 ab
1.34±0.09 ab
1.72±0.08 bc
0.28±0.04 a
HA平均 Average
0.37
1.42
1.79
0.26
HA变异系数 CV
0.15
0.08
0.06
0.10
CK:不添加腐殖酸;HA1:添加5 mg C·L-1腐殖酸;HA2:添加10 mg C·L-1 腐殖酸;HA3:添加15 mg C·L-1腐殖酸; HA4:添加20 mg C·L-1腐殖酸。同列不同字母表示处理间差异达5%显著水平。下同 CK: No HA; HA1: 5 mg C·L-1 HA; HA2: 10 mg C·L-1 HA; HA3: 15 mg C·L-1 HA; HA4: 20 mg C·L-1 HA. Different letters in a column mean significant difference at the 5% level. The same as below
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