scholarly journals Transfer Function and Time Series Outlier Analysis: Modelling Soil Salinity in Loamy Sand Soil by Including the Influences of Irrigation Management and Soil Temperature

2017 ◽  
Vol 67 (2) ◽  
pp. 282-294 ◽  
Author(s):  
Basem Aljoumani ◽  
Josep A. Sànchez-Espigares ◽  
Nuria Cañameras ◽  
Gerd Wessolek ◽  
Ramon Josa
Keyword(s):  
Time Series ◽  
Transfer Function ◽  
Soil Temperature ◽  
Soil Salinity ◽  
Irrigation Management ◽  
Loamy Sand ◽  
Outlier Analysis ◽  
Sand Soil ◽  
Loamy Sand Soil

Some Factors Which Influence the Toxicity of UHF Energy to Weed Seeds

Weed Science ◽  
1977 ◽  
Vol 25 (2) ◽  
pp. 179-183 ◽  
Author(s):  
Robert P. Rice ◽  
Alan R. Putnam
Keyword(s):  
Soil Temperature ◽  
Loamy Sand ◽  
Clay Loam ◽  
Clay Loam Soil ◽  
Sand Soil ◽  
Loamy Sand Soil ◽  
Controlled Conditions ◽  
Weed Seeds ◽  
Loam Soil ◽  
Soil Mixtures

UHF energy (2450 MHz) was applied to seeds and seed-soil mixtures with a waveguide under controlled conditions. After treatment, seeds were germinated at 27 C to determine viability. Seeds were either killed or seedlings grew normally with no intermediate levels of inhibition typical of that produced with sub-lethal dosages of herbicides. The energy required to kill several species of dry seeds ranged from 88 to 183 J/cm2and could be reduced 12 to 42% by a 24-hr imbibition period prior to treatment. When several seed-soil mixtures were treated, the greatest toxicity occurred in a moist muck and clay loam soil, with the least toxicity on a dry loamy sand soil. Although attenuation of activity occurred in dry soils of three types, less energy was required to kill seeds in moist soils than was required in the absence of soil. Increasing the power levels reduced the time of exposure necessary to kill barnyardgrass [Echinochloa crus-galli(L.) Beauv.] seeds. Less energy was required to kill seeds as the soil temperature was increased from −20 to +18 C.

scholarly journals Effect of Macro- and Nano-Biosolid Fractions on Sorption Affinity and Transport of Pb in a Loamy Sand Soil

2019 ◽  
Vol 11 (12) ◽  
pp. 3460 ◽  
Author(s):  
Abdulaziz G. Alghamdi ◽  
Hesham M. Ibrahim
Keyword(s):  
Surface Area ◽  
Land Application ◽  
Surface Reactivity ◽  
Loamy Sand ◽  
Field Scale ◽  
Sand Soil ◽  
Loamy Sand Soil ◽  
Fraction Size ◽  
Potential Impact ◽  
Potential Mobility

Applications of large amounts of biosolid to agricultural lands have raised the concern over its potential impact on co-transport of metal contaminants. In this study, bulk biosolid was fractioned into six macro- and nano-biosolid fraction sizes. We investigated variations in the physicochemical properties of the different biosolid fraction sizes, and assessed sorption affinity and transport of Pb in a loamy sand soil. Decreasing biosolid fraction size from macro to nano resulted in consistent increases in surface area, surface charge, and a decrease in pore size. Biosolid particles >1000 µm showed similar surface properties that differ from biosolid particles < 1000 µm. Sorption affinity for Pb was larger on nano-biosolid as compared to all macro-biosolid fraction sizes. This is mainly attributed to the larger surface area and zeta potential of nano-biosolid, leading to increased surface reactivity and greater stability. Total amount eluted of Pb was increased in the presence of macro- and nano-biosolid by 21.3% and 45.6%, respectively. Our findings suggest that the application of the >1000 µm biosolid fractions can help to minimize adverse effects of biosolid applied in areas susceptible to potential environmental risk of contamination by heavy metals. Further assessment of potential mobility of nano-biosolid at the field scale is needed before the recommendation of including such approach during land application of biosolid.

A Study of Compaction and Crop Yields in Loamy Sand Soil After Seven Years of Reduced Tillage

1986 ◽  
Vol 29 (2) ◽  
pp. 0389-0392 ◽  
Author(s):  
Jonathan Chaplin ◽  
Mike Lueders ◽  
David Rugg
Keyword(s):  
Crop Yields ◽  
Loamy Sand ◽  
Reduced Tillage ◽  
Sand Soil ◽  
Loamy Sand Soil

Controlled Release Starch Granule Formulations Reduce Herbicide Leaching in Soil Columns

1992 ◽  
Vol 6 (2) ◽  
pp. 317-321 ◽  
Author(s):  
Rick A. Boydston
Keyword(s):  
Controlled Release ◽  
Starch Granule ◽  
Soil Column ◽  
Loamy Sand ◽  
Starch Granules ◽  
Soil Columns ◽  
Sand Soil ◽  
Water Dispersible ◽  
Loamy Sand Soil ◽  
Water Dispersible Granule

Experimental controlled release starch granules (CRSG) containing 5.3% a.i. (w/w) norflurazon or 6% a.i. (w/w) simazine retarded the leaching of both herbicides in loamy sand soil columns when compared to commercial formulations of norflurazon [80% (w/w) dry flowable] or simazine [90% (w/w) water dispersible granule]. Barley bioassays indicated norflurazon and simazine remained in the surface 0 to 2.5 cm of soil when applied as CRSG formulations and moved to a depth of 15 cm when applied as commercial dry formulations and leached with 6 cm of water. CRSG placed on pre-wetted soil columns began to release norflurazon by 7 d at 25 C or 14 d at 15 C, and subsequent leaching moved norflurazon beyond the top 2.5 cm of the soil column.

scholarly journals Inoculation and Soil Texture Effects on Yield and Yield Components of Mungbean

2018 ◽  
Vol 10 (9) ◽  
pp. 6 ◽  
Author(s):  
Andre A. Diatta ◽  
Wade E. Thomason ◽  
Ozzie Abaye ◽  
Larry J. Vaughan ◽  
Thomas L. Thompson ◽  
...  
Keyword(s):  
Plant Height ◽  
Seed Yield ◽  
Soil Texture ◽  
Loamy Sand ◽  
Plant Residue ◽  
Silt Loam ◽  
Sand Soil ◽  
Loamy Sand Soil ◽  
Group I ◽  
Number Of Seeds

Mungbean [Vigna radiata (L.) Wilczek] is a short-duration and relatively drought-tolerant crop grown predominantly in the tropics. This grain legume can improve soil fertility through biological nitrogen (N) fixation. To assess the effects of Bradyrhizobium (group I) inoculation on yield and yield attributes of mungbean, a greenhouse study was conducted during Fall 2016 with two mungbean cultivars (‘Berken’ and ‘OK2000’), two inoculum treatments (inoculated and uninoculated), and two soil textures (loamy sand and silt loam). Pots were laid out in a completely randomized design and treatment combinations were replicated seven times. The main effects of cultivar and soil texture significantly (P ≤ 0.05) affected mungbean seed weight and plant residue mass. Seed yield (13%), plant residue (22%), and protein content (6%) of OK2000 were significantly higher than Berken cultivar. A 31% seed yield and 40% plant residue increase were recorded on silt loam soil compared to loamy sand soil. Significant increase in plant height (18%) and number of pods per plant (21%) were also recorded when mungbean plants were grown on silt loam compared to loamy sand soil. Bradyrhizobium inoculation significantly increased the number of pods per plant, the number of seeds per plant, and seed yield. [Cultivar × inoculation] and [cultivar × soil texture] interactions had significant (P ≤ 0.05) effects on number of seeds per pods and plant height, respectively. Understanding the agronomic practices and soil physical properties that may limit mungbean production could help in optimizing its establishment and growth in non-traditional growing areas.

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