Humic fractions of forest, pasture and maize crop soils resulting from microbial activity

Tavares, Rose Luiza Moraes; Nahas, Ely

doi:10.1590/s1517-83822014000300028

Cited by 14 publications

(11 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the studied soils, a large proportion of humic acids were found, which prevailed in the moist variants. This is in line with Tavares and Nahas' study [42]. More humic acids than fulvic acids indicate the potentially low mobility of carbon accumulated in the surface soil horizons [21].…”

Section: Discussionsupporting

confidence: 91%

Soil Organic Matter Accumulation and Carbon Fractions along a Moisture Gradient of Forest Soils

Błońska

Lasota

2017

Forests

View full text Add to dashboard Cite

Abstract:The aim of the study was to present effects of soil properties, especially moisture, on the quantity and quality of soil organic matter. The investigation was performed in the Czarna Rózga Reserve in Central Poland. Forty circular test areas were located in a regular grid of points (100 × 300 m). Each plot was represented by one soil profile located at the plot's center. Sample plots were located in the area with Gleysols, Cambisols and Podzols with the water table from 0 to 100 cm. In each soil sample, particle size, total carbon and nitrogen content, acidity, base cations content and fractions of soil organic matter were determined. The organic carbon stock (SOCs) was calculated based on its total content at particular genetic soil horizons. A Carbon Distribution Index (CDI) was calculated from the ratio of the carbon accumulation in organic horizons and the amount of organic carbon accumulation in the mineral horizons, up to 60 cm. In the soils under study, in the temperate zone, moisture is an important factor in the accumulation of organic carbon in the soil. The highest accumulation of carbon was observed in soils of swampy variant, while the lowest was in the soils of moist variant. Large accumulation of C in the soils with water table 80-100 cm results from the thick organic horizons that are characterized by lower organic matter decomposition and higher acidity. The proportion of carbon accumulation in the organic horizons to the total accumulation in the mineral horizons expresses the distribution of carbon accumulated in the soil profile, and is a measure of quality of the organic matter accumulated. Studies have confirmed the importance of moisture content in the formation of the fractional organic matter. With greater soil moisture, the ratio of humic to fulvic acids (HA/FA) decreases, which may suggest an increase in carbon mobility in soils.

show abstract

Section: Discussionsupporting

confidence: 91%

Soil Organic Matter Accumulation and Carbon Fractions along a Moisture Gradient of Forest Soils

Błońska

Lasota

2017

Forests

View full text Add to dashboard Cite

show abstract

“…Our results showed significant quantitative differences between HS fractions in soils under different land usages. Grasslands provided more organic matter as the C resource to soil and also created favourable conditions for the decomposition and humification of organic matter (Tavares & Nahas, ; You et al., ). In arable soils, agricultural practices reduced the amount of individual HS fractions, in particular the relatively stable HUM fraction.…”

Section: Discussionmentioning

confidence: 99%

Characterization of organic matter fractions in the top layer of soils under different land uses in Central‐Eastern Europe

Ukalska‐Jaruga

Klimkowicz‐Pawlas

Smreczak

2019

Soil Use and Management

View full text Add to dashboard Cite

The objective of this study was to investigate differences in organic matter fractions, such as dissolved organic carbon and humic substances, in soils under different land uses. Soil samples were collected from the upper layer of arable lands and grasslands. Humic substances (HS) were chemically fractionated into fulvic acids (FA), humic acids (HA) and humins (HUM), and based on the separated fractions, the humification index (HI) and the degree of HS transformation (DT) were calculated. Dissolved organic carbon (DOC) was determined by cold (CWE) and hot water (HWE) extractions. Regardless of land use, the results indicated significant differences in soil organic carbon (SOC) and HS composition, with HA and HUM as the dominant fractions. Total SOC was higher in grassland (median = 17.51 g kg−1) than arable soils (median = 9.98 g kg−1); the HI and DT indices did not differ significantly between land uses (HI = 0.3–10.3 and DT = 0.2–6.2 for grasslands, p > 0.05; HI = 0.3–3.9 and DT = 0.2–20.1 for arable lands, p > 0.05). This indicates the relatively high stability of organic carbon and efficient humification processes in both land uses. Additionally, in arable soils lower CWE‐C (0.75 g kg−1) and higher HWE‐C (2.59 g kg−1) than in grasslands (CWE‐C = 1.13 g kg−1, HWE‐C = 1.60 g kg−1) can be related to farming practice and application of soil amendments. The results showed that both labile and humified organic matter are better protected in grassland soils and are consequently less vulnerable to mineralization.

show abstract

“…Under natural conditions, that humification through microbial activities is a relatively slow process. According to Tavares et Nahas (2014) 23 , after a 30-day incubation the humification rate in the soils of the forest, pasture, and maize crop field were 34.21%, 60.34%, and 94.96%, respectively. In contrast, the quick artificial decomposition in this study could accelerate the plant residue decomposition process in 40 min.…”

Section: Discussionmentioning

confidence: 94%

“…www.nature.com/scientificreports/ thoroughly into small molecular organic matters. Thus, compared to the decomposition by microorganism, the humification degree of the produced fertilizers was relatively small at about 20% (calculated from 7% humic substance contents and 35% total soluble organic matter contents in the fertilizers), while the humification degree in soils were generally over 50% 23,24 . In terms of the small molecule organic matters, 343 species of organic matters with a molecular mass inferior to 500 daltons were determined in the produced fertilizers.…”

Section: Discussionmentioning

confidence: 96%

Effects of organic fertilizers via quick artificial decomposition on crop growth

et al. 2021

Sci Rep

View full text Add to dashboard Cite

Applying organic matters into the soil would help to improve soil quality and sustain crop production. In addition, the small molecular organic matters could be active in influencing soil nutrient cycling and crop development. Thus, this study has firstly induced a new technology of quick artificial decomposition to produce fertilizers containing small molecular organic compounds from crop residues and other biological wastes. The fertilizers were produced via the quick artificial decomposition from biological wastes. The small organic species in the fertilizers were identified by the LC–MS. Field experiments of kiwifruit were conducted to test the effects of fertilizers. In total, 341 species of small organic matters have been determined in the produced fertilizers. The results showed that the organic fertilizers could significantly increase the yields of kiwifruit by 15.2% in contrast with mineral fertilizer treatments. Whereas, the organic fertilizers could enhance the contents of nutritive components in kiwifruits. These results proved that the organic fertilizers containing more small organic matter could be more efficient in promoting crop production.

show abstract

Humic fractions of forest, pasture and maize crop soils resulting from microbial activity

Cited by 14 publications

References 31 publications

Soil Organic Matter Accumulation and Carbon Fractions along a Moisture Gradient of Forest Soils

Soil Organic Matter Accumulation and Carbon Fractions along a Moisture Gradient of Forest Soils

Characterization of organic matter fractions in the top layer of soils under different land uses in Central‐Eastern Europe

Effects of organic fertilizers via quick artificial decomposition on crop growth

Contact Info

Product

Resources

About