Comparison of two versions of the acetylene inhibition/soil core method for measuring denitrification loss from an irrigated wheat field

1999 ◽  
Vol 29 (3) ◽  
pp. 328-331 ◽  
Author(s):  
T. Mahmood ◽  
R. Ali ◽  
F. Azam ◽  
K. A. Malik
Keyword(s):  
Soil Core ◽  
Acetylene Inhibition ◽  
Wheat Field ◽  
Core Method ◽  
Irrigated Wheat ◽  
Denitrification Loss

Semicontinuous Measurement of Soil Atmosphere Gases with Gas-Flow Soil Core Method

1995 ◽  
Vol 59 (5) ◽  
pp. 1336-1342 ◽  
Author(s):  
M. Swerts ◽  
G. Uytterhoeven ◽  
R. Merckx ◽  
K. Vlassak
Keyword(s):  
Gas Flow ◽  
Soil Core ◽  
Core Method ◽  
Soil Atmosphere

Analysis of diurnal cycles of interferometric coherence and backscattering coefficient measured on an irrigated wheat field in Morocco

2021 ◽  
Author(s):  
Nadia Ouaadi ◽  
Ludovic Villard ◽  
Jamal Ezzahar ◽  
Pierre-louis Frison ◽  
Saïd Khabba ◽  
...  
Keyword(s):  
Water Movement ◽  
Water Status ◽  
Physiological Activity ◽  
High Sensitivity ◽  
Eddy Correlation ◽  
Backscattering Coefficient ◽  
Time Step ◽  
Area Index ◽  
Wheat Field ◽  
Irrigated Wheat

<p>C-band radar observations have shown a high sensitivity to the water status of vegetation, including forests and crops. Several studies conducted mainly on forests have observed daily changes of the backscattering coefficients between ascending and descending orbits and have suggested that these differences are related to the diurnal cycle of vegetation water content. Likewise, the water movement within annual crops could be associated to change of the phase centre locations leading to a daily cycle of the interferometric coherence as well that has already been observed on tropical forest using C-band in situ acquisitions. In this context, an experimental setup composed of 4C-band antennas targeting an irrigated wheat field was installed at the top of a 20 m tower near Chichaoua (Morocco) from January to June 2020. The collected data includes measurements of the backscattering coefficient at both cross- and parallel polarizations and the interferometric coherence with a 15 mns time step. The field is also equipped with an eddy-correlation station for half hourly measurements of convective fluxes, soil moisture and temperature profiles. Simultaneously, measurement of above-ground biomass, leaf area index, canopy height and surface roughness are also carried out every 15-daysduring the agricultural season.  The preliminary results of the experiment reveal the existence of strong correlation between the daily evolution of interferometric coherence and the physiological activity of wheat at dawn while the changes observed in the afternoon are ratherrelated to the wind peaks. For the backscattering coefficient, a good agreement is observed between the evolution of its daily average and the evolution of evapotranspiration. These open insights for the monitoring of the crops water status using radar dataacquired at sub-daily timescale.</p>

scholarly journals First Record of the Genus Myopias (Hymenoptera, Formicidae) from India, with Description of New Species

2012 ◽  
Vol 46 (1) ◽  
pp. e-33-e-35 ◽  
Author(s):  
H. Bharti ◽  
A. Wachkoo
Keyword(s):  
New Species ◽  
Body Size ◽  
First Record ◽  
Soil Core ◽  
Northwest Himalaya ◽  
Reduced Body ◽  
Core Method ◽  
First Time ◽  
Single Worker

First Record of the Genus Myopias (Hymenoptera, Formicidae) from India, with Description of New Species Myopias shivalikensis Bharti et Wachkoo, sp. n. is described based on a single worker, collected in lower Shivalik range (700 m a. s. l.) of Northwest Himalaya by soil core method. The genus Myopias is recorded for the first time in India. M. shivalikensis is a cryptobiotic species with reduced body size and rudimentary eyes. It is similar to M. nops Willey et Brown, 1983, distinctly differing from all described species of this genus.

A SOIL CORE METHOD FOR ESTIMATING N-MINERALIZATION AND DENITRIFICATION DURING COVER CROP DECOMPOSITION

Soil Science ◽  
1997 ◽  
Vol 162 (7) ◽  
pp. 510-517 ◽  
Author(s):  
D. R. Shelton ◽  
A. M. Sadeghi ◽  
G. W. McCarty ◽  
A. R. Isensee
Keyword(s):  
Cover Crop ◽  
N Mineralization ◽  
Soil Core ◽  
Core Method

Fate of nitrogen in slurries applied to land

1990 ◽  
Vol 1990 ◽  
pp. 42-42
Author(s):  
Brian F. Pain
Keyword(s):  
Nitrate Leaching ◽  
Management Practices ◽  
Wind Tunnels ◽  
Soil Core ◽  
Acetylene Inhibition ◽  
N Losses ◽  
Animal System ◽  
Fate Of Nitrogen ◽  
Waste Management Practices ◽  
Incubation Method

Much of the N ingested by livestock is excreted; slurries from housed animals therefore represent substantial pools of N. Recycling through the soil-piant-animal system can reduce fertilizer usage, but current waste management practices often result in water or atmospheric pollution. This may occur directly, for example through contamination of water by a leaking slurry store, or indirectly through losses of plant nutrients, especially N, to the wider environment. The adverse effects of gaseous losses, from NH3, volatilisation and denitrification, and of nitrate leaching are becoming increasingly well recognised. Such losses also reduce the amounts of N available for uptake by plants and may account for low, variable crop responses to applied slurries. The objectives of this study are to quantify losses of N following application of slurries to land and to examine strategies for reduction, so conserving N for uptake by plants.Following application of slurries to land, mainly grassland, N losses through NH3, volatilisation were measured by using small wind tunnels or micrometeorological techniques, through denitrification by a soil core incubation method with acetylene inhibition and through nitrate leaching in lysimeter experiments.

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