Nitrogen fractions in the microbial biomass in soils of southern Brazil

Camargo, Flávio Anastácio de Oliveira; Gianello, Clésio; Vidor, Caio

doi:10.1590/s0100-06831999000100022

Cited by 6 publications

(4 citation statements)

References 8 publications

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“…According to Camargo et al (1999), under conditions that favor the proliferation of microbial biomass, the hexosamine-N content in the soil increases, but over time it may decrease with the limitation of the substrate. González-Prieto et al (1997) observed decrease in the contents of this fraction after application of mineral fertilization in maize and pasture, suggesting that this form is part of an initial active pool of mineralizable N, which is related to the transitory increase in the soil microbial population.…”

Section: Resultsmentioning

confidence: 99%

“…The application rate of 50 m 3 ha -1 exceeds the MF in all the soil layers evaluated, and application rates greater than or equal to 100 m 3 ha -1 up to the 5 cm depth and 200 m 3 ha -1 in the 5-10 and 0-10 cm layers lead to the greatest contents of this N fraction in the soil (Table 5). This form of N is present in amino acids which make up proteins that underwent a peptide bond during protein synthesis (Camargo et al, 1999) where N is bound to the alpha group of the carbon, with high bonding energy by hydrogen bridges, Van der Waals forces, and covalent complexes to humic colloids (Stevenson, 1994). González-Prieto and Carballas (1991) observed a decrease in the α-amino-N fraction in cropped soils when compared to natural soils, suggesting that this form may be easily mineralizable and potentially available to plants.…”

Section: Resultsmentioning

confidence: 99%

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Organic Nitrogen in a Typic Hapludox Fertilized With Pig Slurry

Grohskopf

Cassol

Corrêa

et al. 2015

Rev. Bras. Ciênc. Solo

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The application of pig slurry may have a different effect on nitrogen dynamics in soil compared to mineral fertilization. Thus, the aim of this study was to determine the different forms of organic n in a latossolo Vermelho distroférrico (Typic Hapludox) and their relationship to n uptake by crops in response to 10 years of annual application of pig slurry and mineral fertilizer. The treatments were application rates of 0, 25, 50, 100, and 200 m 3 ha -1 of pig slurry, in addition to mineral fertilizer, organized in a randomized block design with four replications. The n contents were determined in the plant tissue and in the forms of total n and acid hydrolyzed fractions: ammonium-n, hexosamine-n, α-amino-n, amide-n, and unidentified-N. Annual application of pig slurry or mineral fertilizer increased the total-N content in the 0-10 cm depth layer. The main fractions of organic N in the soil were α-amino-N when pig slurry was applied and unidentified-N in the case of mineral fertilizers. Pig slurry increased the N fractions considered as labile: α-amino-N, ammonium-N, and amide-N. The increase in these labile organic n fractions in the soil through pig slurry application allows greater n uptake by the maize and oat crops in a no-tillage system.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Organic Nitrogen in a Typic Hapludox Fertilized With Pig Slurry

Grohskopf

Cassol

Corrêa

et al. 2015

Rev. Bras. Ciênc. Solo

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show abstract

“…However, the MBN as a percentage of TN obtained are lower than the ranges reported in MBC/MBN MBC/OC MBN/TN literature by other workers for arable, pasture and forest; and the low values indicate that the microbial biomass is not important as a sink for N in these areas [27]. Differences in biomass content are directly related to the primary factors affecting microbial ecology [31]. Climatic factors play significant role on biodegradable organic material and microbial growth [32].…”

Section: Effect Of Land Use On Soil Microbial Biomass Ratiomentioning

confidence: 77%

Soil Quality Assessment of Different Land Use in Kabba Southern Guinea Savannah of Nigeria

Babalola

Yahqub

2019

IJPSS

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The study assessed the soil qualities of five land use types; Oil palm plantation, Nursery site, Forest (Teak), Citrus orchard and Arable Crop land in Kabba College of Agriculture using selected biological indicators which include, Organic Carbon (OC), Total Nitrogen (TN), Microbial Biomass Carbon (MBC) and Microbial Biomass Nitrogen (MBN). An area of 40 m x 30 m that is representative of each land use was selected, sampled and analyzed following standard procedures for laboratory analysis. The highest values of OC (18.41 g/kg) and TN (7.95 g/kg) were obtained at the nursery site followed by Oil Palm (OC - 14.12 g/kg; TN - 6.56 g/kg), the lowest values were obtained at the Arable Crops site (OC - 10.53 g/kg; TN - 5.20 g/kg). The MBC values ranged from 307 – 498 mg/kg across the land use studied. The MBN values obtained in this study ranged between 16.93 - 34.41 mg/kg. The MBC/MBN ratios obtained in this study were relatively high and in the following order Forest land (26.5 mg/kg) > Oil Palm Plantation (21.3 mg/kg) > Citrus orchard (19.5 mg/kg) > Nursery site (15.9 mg/kg) > Arable Crops land (12.2 mg/kg) respectively indicating the predominance of fungi in these soils. It is recommended that sustainable practices that will encourage replenishment of C and N into the soil should be adopted in the study area.

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“…This result may be related to climate factors (Figure 1) during the experimental time, as the first cycle presented an imbalance relative to qCO 2 although it promoted a higher BSR value. According to Cattelan and Vidor (1990), this variable can be influenced by factors such as humidity, temperature, and soil nutrient availability. UB S , CJs, and the intercrop systems UBCJ I , UBCE I , and PGCJ I were grouped with the highest means of MBC in the first cycle, while CE S , MA S , UBCE I , and PGCE I were the cover crops that most favored MBC in the second cycle (Table 1).…”

Section: Resultsmentioning

confidence: 99%

Cover crops on soil quality and yield of cowpea under no-tillage in the Amazon savanna

Rocha,

Maia,

Melo

et al. 2023

Acta Sci. Agron.

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Conservation practices such as no-tillage are necessary to maintain, and/or improve agricultural soil quality. However, straw formation and maintenance in tropical regions is a limiting factor to adopting this system. In this sense, this research aimed to study the effect of cover crops on straw formation, soil quality indicators, and cowpea yield under no-tillage in the Amazon savanna. Two experiments were carried out in consecutive years, on a Latossolo Amarelo. The treatments consisted of the straw of cover crops in a single (S) and intercrop (I) system, as follows: Urochloa brizantha (UBS), Pennisetum glaucum (PGS), Crotalaria juncea (CJS), Canavalia ensiformis (CES), Mucuna aterrima (MAS), U. brizantha and C. juncea (UBCJI), U. brizantha and C. ensiformis (UBCEI), P. glaucum and C. juncea (PGCJI), P. glaucum and C. ensiformis (PGCEI), and spontaneous vegetation (SV). Cowpea was cultivated after desiccation of the cover crops. Most of the straw favored soil particle aggregation, except for C. juncea and SV, which negatively influenced this variable. Basal soil respiration, organic carbon content, potassium, base saturation, geometric mean diameter, macroaggregates, and macroporosity at layer of 0-0.10 m were the most sensitive indicators for improving soil quality in a savanna environment. UBS, UBCJI, and UBCEI were superior to the other treatments in improving soil quality. Almost all treatments increased cowpea yield by up to 29%, except for CJS and SV.

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Nitrogen fractions in the microbial biomass in soils of southern Brazil

Cited by 6 publications

References 8 publications

Organic Nitrogen in a Typic Hapludox Fertilized With Pig Slurry

Organic Nitrogen in a Typic Hapludox Fertilized With Pig Slurry

Soil Quality Assessment of Different Land Use in Kabba Southern Guinea Savannah of Nigeria

Cover crops on soil quality and yield of cowpea under no-tillage in the Amazon savanna

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