Combining humic acid with phosphate fertilizer affects humic acid structure and its stimulating efficacy on the growth and nutrient uptake of maize seedlings

被引：47
作者：
Jing, Jianyuan [1 ]
Zhang, Shuiqin [1 ]
Yuan, Liang [1 ]
Li, Yanting [1 ]
Lin, Zhian [1 ]
Xiong, Qizhong [2 ]
Zhao, Bingqiang [1 ]
机构：
[1] Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Minist Agr & Rural Affairs, Key Lab Plant Nutr & Fertilizer, Beijing 100081, Peoples R China
[2] Anhui Agr Univ, Sch Resources & Environm, Anhui Prov Key Lab Farmland Ecol Conservat & Poll, Hefei 230036, Peoples R China
来源：
SCIENTIFIC REPORTS | 2020年 / 10卷 / 01期
关键词：
ORGANIC-MATTER; SUBSTANCES; PHOSPHORUS; COAL; SOIL;
D O I：
10.1038/s41598-020-74349-6
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
This paper analyzed the compositional and structural changes of humic acid (HA) after combined with phosphate fertilizer (PHA), and investigated its effects on the growth of maize seedlings with four humic acid concentrations. The results showed that the atomic ratios of O/C and (O+N)/N of PHA were significantly lower than those of HA, which indicated that PHA had poor hydrophilicity compared with HA. The spectra of FTIR and NMR results suggested that the relative content of carboxyl group in PHA was higher than that in HA. X-ray photoelectron spectroscopy technology showed that the relative amount of C-C in PHA was lower than that in HA, while C-H was the opposite. The above changes were attributed to the crack of HA structure during the preparation of humic acid enhanced phosphate fertilizer, which was verified by the results from the determination of gel permeation chromatography that there were more low molecular weight components in PHA than that in HA. However, compared with HA, PHA showed a worse effect in promoting growth and the uptake of nitrogen, phosphorus and potassium by maize seedlings. This worse effect might be attributed to the poor hydrophilicity and unsuitable addition amount of PHA.
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页数：10
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