A Timesaving Technique for Measuring Respiration Rates in Incubated Soil Samples

1982 ◽  
Vol 46 (5) ◽  
pp. 1114-1116 ◽  
Author(s):  
Nelson T. Edwards
Keyword(s):  
Soil Samples ◽  
Respiration Rates

scholarly journals Decomposability of Soil Samples along a Moisture Gradient in a Peat Bog in Siikaneva, Finland

2021 ◽  
Author(s):  
Johanna Schwarzer ◽  
Lona van Delden ◽  
Jens Strauss ◽  
Claire Treat
Keyword(s):  
Climate Change ◽  
Organic Matter ◽  
Moisture Gradient ◽  
Soil Samples ◽  
Chemical Characteristics ◽  
Peat Bog ◽  
Decomposition Rates ◽  
Respiration Rates ◽  
Physico Chemical

<p>Climate change is already affecting moisture dynamics in wetlands and previously moist soils. Elongated and localized dry spells lead to more aerobic conditions in previously oxygen depleted soils, favourable for organic matter decomposition. The substrate quality of older organic matter might, on the other hand, limit decomposition rates. The persistence of organic material towards microbial degradation and its relation to physico-chemical characteristics as well as biomarkers is however still unclear.</p><p>We are investigating soil organic matter characteristics and comparing them to soil respiration rates to quantify the soil’s persistence towards aerobic decomposition. Lipid biomarkers together with physico-chemical characteristics will assess the source and quality of soil organic matter and be compared to 60 days of aerobic respiration rates. Soil samples were taken up to 1m along a moisture gradient from a peat bog, an intermediate bushy site, and the adjacent forest in Siikaneva, Finland.</p><p>We hypothesize that soil respiration in aerobic incubations can be predicted by soil characteristics. Thus, from this data set, estimates of soil carbon vulnerability could be inferred and help predict decomposition rates with progressing climate change.</p>

K-MEANS CLUSTERING ALGORITHM BASED CLASSIFICATION OF SOIL FERTILITY IN NORTH WEST NIGERIA

2020 ◽  
Vol 4 (2) ◽  
pp. 780-787
Author(s):  
Ibrahim Hassan Hayatu ◽  
Abdullahi Mohammed ◽  
Barroon Ahmad Isma’eel ◽  
Sahabi Yusuf Ali
Keyword(s):  
Soil Fertility ◽  
Crop Yield ◽  
Clustering Algorithm ◽  
Soil Samples ◽  
North West ◽  
R Programming ◽  
Available Information ◽  
Northwest Region ◽  
The Relationship

Soil fertility determines a plant's development process that guarantees food sufficiency and the security of lives and properties through bumper harvests. The fertility of soil varies according to regions, thereby determining the type of crops to be planted. However, there is no repository or any source of information about the fertility of the soil in any region in Nigeria especially the Northwest of the country. The only available information is soil samples with their attributes which gives little or no information to the average farmer. This has affected crop yield in all the regions, more particularly the Northwest region, thus resulting in lower food production.  Therefore, this study is aimed at classifying soil data based on their fertility in the Northwest region of Nigeria using R programming. Data were obtained from the department of soil science from Ahmadu Bello University, Zaria. The data contain 400 soil samples containing 13 attributes. The relationship between soil attributes was observed based on the data. K-means clustering algorithm was employed in analyzing soil fertility clusters. Four clusters were identified with cluster 1 having the highest fertility, followed by 2 and the fertility decreases with an increasing number of clusters. The identification of the most fertile clusters will guide farmers on where best to concentrate on when planting their crops in order to improve productivity and crop yield.

EFFECT OF VARIOUS HORMONES ON THE KIDNEY RESPIRATION RATES IN THE CUTTHROAT TROUT (SALMO CLARKI CLARKI)

1960 ◽  
Vol XXXIII (III) ◽  
pp. 428-436 ◽  
Author(s):  
W. N. Holmes
Keyword(s):  
Single Dose ◽  
Respiration Rate ◽  
Cutthroat Trout ◽  
Adaptive Mechanism ◽  
Respiration Rates ◽  
Salmo Clarki

ABSTRACT Relatively large doses of vasopressin administered intraperitoneally to the trout significantly enhanced the kidney respiration rate. In contrast to vasopressin a single dose of oxytocin depressed the kidney Qo2 value. This depression continued throughout the observed 24 hour period after injection. Cortisol enhanced the kidney Qo2 values significantly and to a greater extent than vasopressin. These results are discussed in relation to possible adaptive mechanism in euryhaline species of teleosts.

Characterization of dissolved organic matter (DOM) extracted from soils by hot water percolation (HWP)

2010 ◽  
Vol 59 (1) ◽  
pp. 99-108 ◽  
Author(s):  
M. Takács ◽  
Gy. Füleky
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Extraction Methods ◽  
Soil Samples ◽  
Hot Water ◽  
Soil Extracts ◽  
Water Percolation ◽  
Soil Humic Acid

The Hot Water Percolation (HWP) technique for preparing soil extracts has several advantages: it is easily carried out, fast, and several parameters can be measured from the same solution. The object of this study was to examine the possible use of HWP extracts for the characterization of soil organic matter. The HPLC-SEC chromatograms, UV-VIS and fluorescence properties of the HWP extracts were studied and the results were compared with those of the International Humic Substances Society (IHSS) Soil Humic Acid (HA), IHSS Soil Fulvic Acid (FA) and IHSS Suwannee Natural Organic Matter (NOM) standards as well as their HA counterparts isolated by traditional extraction methods from the original soil samples. The DOM of the HWP solution is probably a mixture of organic materials, which have some characteristics similar to the Soil FA fractions and NOM. The HWP extracted organic material can be studied and characterized using simple techniques, like UV-VIS and fluorescence spectroscopy.

Sign in / Sign up

Export Citation Format

Share Document