Understanding and improving crop root function

2021 ◽  
Keyword(s):  
Root Function ◽  
Crop Root

Correlation of Electrical, Structural, and Optical Properties of Erbium In Silicon

1993 ◽  
Vol 301 ◽  
Author(s):  
J. L. Benton ◽  
D. J. Eaglesham ◽  
M. Almonte ◽  
P. H. Citrin ◽  
M. A. Marcus ◽  
...  
Keyword(s):  
Root Function ◽  
Free Exciton ◽  
Excitation Power ◽  
Optically Active ◽  
Photoluminescence Intensity ◽  
Square Root ◽  
Structural And Optical Properties ◽  
X Ray ◽  
X Ray Absorption ◽  
Donor Activity

ABSTRACTAn understanding of the electrical, structural, and optical properites of Er in Si is necessary to evaluate this system as an opto-electronic material. Extended x-ray absorption fine structure, EXAFS, measurements of Er-implanted Si show that the optically active impurity complex is Er surrounded by an O cage of 6 atoms. The Er photoluminescence intensity is a square root function of excitation power, while the free exciton intensity increases linearly. The square root dependence of the 1.54μm-intensity is independent of measurement temperature and independent of co-implanted species. Ion-implantation of Er in Si introduces donor activity, but spreading resistance carrier concentration profiles indicate that these donors do not effect the optical activity of the Er.

scholarly journals Overestimation of Crop Root Biomass in Field Experiments Due to Extraneous Organic Matter

2017 ◽  
Vol 8 ◽  
Author(s):  
Juliane Hirte ◽  
Jens Leifeld ◽  
Samuel Abiven ◽  
Hans-Rudolf Oberholzer ◽  
Andreas Hammelehle ◽  
...  
Keyword(s):  
Organic Matter ◽  
Root Biomass ◽  
Field Experiments ◽  
Crop Root

Sulphur in Northern Nigerian Soils: 1. The effects of cultivation and fertilizers on total S and sulphate patterns in soil profiles

1972 ◽  
Vol 78 (3) ◽  
pp. 465-470 ◽  
Author(s):  
A. R. Bromfield
Keyword(s):  
Crop Yields ◽  
Farmyard Manure ◽  
Natural Vegetation ◽  
Soil Profiles ◽  
Organic S ◽  
Nigerian Soils ◽  
Natural Fallow ◽  
Crop Root ◽  
Almost All ◽  
Savannah Zone

SUMMARYOrganic-S and sulphate-S were measured in the Northern Guinea savannah zone down soil profiles under undisturbed natural vegetation, and in land cleared and cropped, with and without fertilizers and farmyard manure. The main soil type was a drained, red to red-brown, sandy clay to clay loam (pH 4·1–5·6 in 0·01 M-Cal2), which strongly sorbed sulphate.Organic-S was most in the surface layers and decreased with depth. Root remains from the natural fallow vegetation, present up to 9 years after clearance, strongly influenced the distribution of organic-S. The roots disappeared after 19 years, when distribution of organic-S mainly reflected crop-root distribution; amounts of organic-S were related to crop yields. FYM was less effective in maintaining organic-S than fertilizers containing P and N.Profiles under natural vegetation contained little sulphate-S but it accumulated in the sub-soil after clearance when S was not removed. The sulphate pattern of profiles under unfertilized crops resembled that under natural vegetation. All fertilized sites had a well-defined sulphate sorbtion pattern, the deepest maximum was at 50 cm on a plot where more than 800 kg S/ha had been applied in nineteen annual aounts. Sulphate-S ranged from > 1 ppm, in the deepest samples, to 52 ppm at the absorption maximum.Almost all the sulphur applied was in the profiles or removed in harvested crops, showing that losses from erosion and leaching were small.

scholarly journals Biomechanical implications of the congenital bicuspid aortic valve: A finite element study of aortic root function from in vivo data

2010 ◽  
Vol 140 (4) ◽  
pp. 890-896.e2 ◽  
Author(s):  
Carlo A. Conti ◽  
Alessandro Della Corte ◽  
Emiliano Votta ◽  
Luca Del Viscovo ◽  
Ciro Bancone ◽  
...  
Keyword(s):  
Finite Element ◽  
Aortic Valve ◽  
Bicuspid Aortic Valve ◽  
Aortic Root ◽  
Root Function ◽  
Finite Element Study ◽  
Element Study

LONG-TERM TILLAGE AND CROP ROTATION EFFECTS ON RESIDUAL NITRATE IN THE CROP ROOT ZONE AND NITRATE ACCUMULATION IN THE INTERMEDIATE VADOSE ZONE

1997 ◽  
Vol 40 (5) ◽  
pp. 1321-1327 ◽  
Author(s):  
A. Katupitiya ◽  
D. E. Eisenhauer ◽  
R. B. Ferguson ◽  
R. F. Spalding ◽  
F. W. Roeth ◽  
...  
Keyword(s):  
Crop Rotation ◽  
Vadose Zone ◽  
Root Zone ◽  
Nitrate Accumulation ◽  
Crop Root ◽  
Residual Nitrate
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