scholarly journals Effects of urea enhanced with different weathered coal-derived humic acid components on maize yield and fate of fertilizer nitrogen

2019 ◽  
Vol 18 (3) ◽  
pp. 656-666 ◽  
Author(s):  
Shui-qin ZHANG ◽  
Liang YUAN ◽  
Wei LI ◽  
Zhi-an LIN ◽  
Yan-ting LI ◽  
...  
Keyword(s):  
Humic Acid ◽  
Maize Yield ◽  
Fertilizer Nitrogen ◽  
Weathered Coal

scholarly journals Associations Between Different Soil Management Practices, Soil Fauna and Maize Yield

2018 ◽  
Vol 10 (9) ◽  
pp. 333 ◽  
Author(s):  
Ana Luiza Privado Martins ◽  
Glécio Machado Siqueira ◽  
Emanoel Gomes de Moura ◽  
Raimunda Alves Silva ◽  
Anágila Janenis Cardoso Silva ◽  
...  
Keyword(s):  
Humic Acid ◽  
Grain Yield ◽  
Management Practices ◽  
Soil Fauna ◽  
Block Design ◽  
Soil Management ◽  
Maize Yield ◽  
Maize Grain Yield ◽  
Wiener Diversity Index ◽  
Maize Grain

Soil fauna play an important role in ecosystems, and in this context, it is important to better understand how the abiotic and biotic drivers of these organisms interact. We hypothesize that soil fauna are affected by different soil management practices, which has an influence on maize grain yields. The aim of this study was to evaluate the structure of soil fauna under different soil management practices and their associations with maize grain yield. The experiment was conducted in Maranhão, Brazil, in an area divided into 24 plots of 4 × 10 m in a randomized block design with six treatments with four replicates (R). Pitfall traps were placed in the area. The treatments were Leucaena leucocephala-Leucaena (L), nitrogen (N), humic acid + nitrogen (HA + N), nitrogen + Leucaena (N + L), humic acid + Leucaena (HA + L) and humic acid + nitrogen + Leucaena (HA + N + L). The soil fauna dominance, abundance, richness, Shannon-Wiener diversity index, Pielou evenness index and maize grain yield were determined. Formicidae was clearly affected by management with Leucaena, while Coleoptera was affected by management with nitrogen. Despite this, Isopoda and Diplura were the only groups associated with the maize yield. Although fauna abundance did not differ among treatments, it was related to the yield. This study confirms that the abundance and some taxa of soil fauna can influence yield and that these organisms can be used to increase agricultural sustainability.

scholarly journals Characterization of Ultrafiltration-Fractionated Humic Acid Derived from Chinese Weathered Coal by Spectroscopic Techniques

Agronomy ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2030
Author(s):  
Shuiqin Zhang ◽  
Liang Yuan ◽  
Yanting Li ◽  
Bingqiang Zhao
Keyword(s):  
Molecular Weight ◽  
Humic Acid ◽  
Atomic Ratio ◽  
Raw Material ◽  
Spectroscopic Techniques ◽  
Acid Fraction ◽  
Aromatic Rings ◽  
Xps Spectra ◽  
Weathered Coal ◽  
Degree Of Aromaticity

Weathered coal is a widely used raw material of farm-oriented humic acid in China, while the high heterogeneity impedes its sufficient utilization. In this study, we fractionated the humic acid derived from Chinese weathered coal by ultrafiltration, and three fractions with the molecular range of ≥100 kDa, 10–100 kDa, ≤10 kDa were obtained. Subsequently, the chemical and spectral properties of the fractions were characterized by elemental analysis, potentiometric titration, Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR), and X-ray photoelectron (XPS) and other spectroscopy. The results showed that more than 60% of humic acid by weight was concentrated in the molecular range higher than 100 kDa, while only 3.25% was assigned to that with molecular weight lower than 10 kDa. The humic acid fraction with molecular weight higher than 100 kDa showed more carbon content, lower H/C atomic ratio, while higher E4/E6 ratio, more aromatic structure in FTIR, 13C NMR, and XPS spectra, indicating a higher degree of aromaticity and stronger hydrophobicity. Conversely, there were more carboxyl groups and aliphatic structures, while fewer condensed aromatic rings for the humic acid fraction with molecular weight less than 100 kDa. These differences provide a baseline for the better utilization of weathered coal.

scholarly journals Influence of Super Absorbent Polymer and Humic Acid on Maize Yield and Nutrient Uptake on Rainfed Alfisols

2021 ◽  
pp. 97-106
Author(s):  
Kasthuri Rajamani ◽  
K. Indudhar Reddy ◽  
A. Srinivas
Keyword(s):  
Humic Acid ◽  
Nutrient Uptake ◽  
Agricultural Research ◽  
Block Design ◽  
Maize Yield ◽  
Research Station ◽  
Positive Interaction ◽  
Super Absorbent Polymer ◽  
Plant Weight ◽  
Absorbent Polymer

The advances and development in agriculture depend not only on mechanization and new hybrid seeds but also on the improvement of soil physical and chemical properties which in turn help to increase crop productivity in dry land soils. A field study was carried out to study the influence of superabsorbent polymer at 2.5 and 4.5 kg ha-1and humic acid at 15 and 30 kg ha-1 alone and their combinations with recommended 100% fertilizers on yield, uptake, and photosynthetic pigments of maize grown on rainfed alfisols at Regional Agricultural Research Station, Palem, Telangana. The experiment was laid out in randomized block design with three replications, consisting of nine treatments. Further, results showed that conjoint application of [email protected] kg ha-1 + humic acid@30 kg ha-1 along with 100% RDF package significantly increased the pooled grain and stover yield (7136 and 8457 kg ha-1) of maize. Irrespective level of hydrogel and humic acid combinations with 100% RDF increased the macronutrient uptake by grain and stover, which further build up the total uptake. A similar pattern was also observed in corresponding to grain and stover yield.The chlorophyll “a”, “b” and total chlorophyll content (1.81, 1.69 1.54; 0.69, 0.62, 0.55 and 2.65, 2.46 and 2.24 mg g-1 in fresh plant weight at 30, 60 and 90 DAS) significantly influenced by application of [email protected] kg ha-1+ humic acid@30 kg ha-1.  In conclusion, the present investigation indicates the positive interaction between humic acid and super absorbent polymer which improved nutrient uptake and maize yield.

scholarly journals Removal of Cd(II) from Water by HPEI Modified Humin

2020 ◽  
Vol 12 (19) ◽  
pp. 7931
Author(s):  
Sanmei Li ◽  
Mingda Wu ◽  
Linghong Lu ◽  
Jiabao Zhu
Keyword(s):  
Humic Acid ◽  
Adsorption Capacity ◽  
Low Cost ◽  
Raw Material ◽  
Flame Atomic Absorption Spectroscopy ◽  
X Ray ◽  
Adsorption Performance ◽  
Flame Atomic Absorption ◽  
Weathered Coal ◽  
Cost Treatment

Humin is the waste residue from the process of preparing humic acid, which accounts for a large proportion of the raw material (weathered coal humic acid). Its Cd(II) adsorption performance is far inferior to that of humic acid. How to regenerate humin is of great significance to the low-cost treatment of Cd(II) pollution in wastewater. In this study, humin was modified by hyperbranched polyethyleneimine to enhance the adsorption capacity for Cd(II). Fourier transform infrared spectroscopy and the X-ray photoelectron spectrometer showed that hyperbranched polyethyleneimine was grafted to the surface of humin. Flame atomic absorption spectroscopy showed that the saturated Cd(II) adsorption capacity of the modified humin was increased to 11.975 mg/g, which is about 5 times than that of humin and is also higher than that of humic acid. The adsorption kinetics, adsorption isotherm, and thermodynamic properties of humic acid, humin, and modified humin were also studied. This study may provide a foundation for research utilizing natural resources to reduce heavy metal pollution in the environment.

Effect of bentonite-humic acid application on the improvement of soil structure and maize yield in a sandy soil of a semi-arid region

Geoderma ◽  
2019 ◽  
Vol 338 ◽  
pp. 269-280 ◽  
Author(s):  
Lei Zhou ◽  
Carlos M. Monreal ◽  
Shengtao Xu ◽  
Neil B. McLaughlin ◽  
Huaying Zhang ◽  
...  
Keyword(s):  
Humic Acid ◽  
Sandy Soil ◽  
Arid Region ◽  
Soil Structure ◽  
Maize Yield ◽  
Semi Arid Region ◽  
Semi Arid

scholarly journals Preparation of Fulvic Acid and Low-molecular Organic Acids by Oxidation of Weathered Coal Humic Acid.

2002 ◽  
pp. 345-350 ◽  
Author(s):  
Toshiyuki SHINOZUKA ◽  
Akira ITO ◽  
Osamu SASAKI ◽  
Yuki YAZAWA ◽  
Tatsuaki YAMAGUCHI
Keyword(s):  
Humic Acid ◽  
Organic Acids ◽  
Fulvic Acid ◽  
Weathered Coal

Sorption of norfloxacin onto humic acid extracted from weathered coal

2012 ◽  
Vol 102 ◽  
pp. 165-172 ◽  
Author(s):  
Qin Zhang ◽  
Ling Zhao ◽  
Yuan-hua Dong ◽  
Guan-yi Huang
Keyword(s):  
Humic Acid ◽  
Weathered Coal
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