NITROUS OXIDE EVOLUTION RATES FROM FERTILIZED SOIL: EFFECTS OF APPLIED NITROGEN

1980 ◽  
Vol 60 (3) ◽  
pp. 429-438 ◽  
Author(s):  
D. J. McKENNEY ◽  
K. F. SHUTTLEWORTH ◽  
W. I. FINDLAY
Keyword(s):  
Nitrous Oxide ◽  
Agricultural Soil ◽  
Sandy Loam ◽  
Potassium Nitrate ◽  
Fertilized Soil ◽  
Extreme Variability ◽  
Soil Effects ◽  
Nitrous Oxide Evolution ◽  
Long Term Studies

Nitrous oxide emission from agricultural soil has been measured in two relatively long-term studies over two different soil types, Brookston clay and Fox sandy loam, located at Woodslee and Harrow Ontario, respectively. The clay plots treated with various amounts (0–366 kg N∙ha−1) of ammonium nitrate, potassium nitrate, or urea were routinely monitored for periods up to 1 yr. Extreme variability in rates within the range 109–1013 molecules∙cm−2∙s−1 was observed (1 × 109 molecules∙cm−2∙s−1 = 4.02 = 10−4 kg N∙ha−1∙day−1 = 1.68 μg N∙m−2∙h−1). Over sandy loam, rates which were lower and more uniform (108–1011 molecules∙cm−2∙s−1) showed a strong correlation with amount of NH4NO3 applied. About 0.25% of applied fertilizer was released as N2O within 80 days following treatment.

scholarly journals Effect of Irrigation and Berm on Growth of Peach Trees during Establishment

HortScience ◽  
1998 ◽  
Vol 33 (4) ◽  
pp. 600b-600
Author(s):  
B.D. McCraw ◽  
Becky Carroll
Keyword(s):  
Sandy Loam ◽  
Tree Trunk ◽  
Water Drainage ◽  
Production Region ◽  
Canopy Area ◽  
Significant Difference ◽  
Loam Soil ◽  
Soil Effects ◽  
Peach Trees

Long-term success in peach production requires the best possible site, but the ideal site is difficult to find. Risk of crop loss to spring freeze dictates that trees be on high ground. As a result, the best site available may have less than optimum soil. Effects of irrigation on peach tree growth are well documented. Raised beds have been used in other crops to insure adequate water drainage away from roots of crop plants. Results from larger beds or berms in combination with irrigation on peaches have been reported in Ohio, but little information is available for the southeast production region. In this study, berms on a Teller Fine Sandy Loam soil were constructed with a road grader in Oct. 1993. The berms were 55.8 cm high, 61 cm wide at the top, and sloped ≈30° to a base width of 4.3 m. `Flameprince'/Lovell trees were planted in Mar. 1994, 6.1 m between rows and 5.5 m between trees in rows. The experiment was a split-plot design with four replications and three trees per treatment replication. Treatments consisted of no irrigation, 40% or 80% pan evaporation (PE) replacement in combination with berm or flat planting surface. Irrigation was supplied by means of emitters which applied 3.7 L per hour. Two emitters per tree were located in the row 45.7 cm either side of the tree trunk. During the first 4 years there was no significant difference between 40% and 80% PE irrigation treatments. Likewise, no significant interactions occurred. Tree trunk caliper, canopy area, and height were greater in irrigated plots and the same or greater from trees in flat plots in all cases.

Nitrous oxide evolution from agricultural soil: A regression approach

1995 ◽  
Vol 12 (1) ◽  
pp. 114-120
Author(s):  
Wang Shaobin ◽  
Song Wenzhi ◽  
Su Weihan ◽  
Zeng Jianghai ◽  
Wang Zhiping ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Agricultural Soil ◽  
Regression Approach ◽  
Nitrous Oxide Evolution

Implications of Long-Term Studies of Three Model Preschool Programs for Head Start

2008 ◽  
Author(s):  
Lawrence J. Schweinhart ◽  
Elena V. Malofeeva ◽  
Lawrence J. Schweinhart ◽  
Michelle M. Englund ◽  
Arthur J. Reynolds ◽  
...  
Keyword(s):  
Head Start ◽  
Preschool Programs ◽  
Long Term Studies

Emissions of nitrous oxide and nitric oxide associated with the decomposition of arable crop residues on a sandy loam soil in Eastern England

Agronomie ◽  
2002 ◽  
Vol 22 (7-8) ◽  
pp. 731-738 ◽  
Author(s):  
Roland Harrison ◽  
Sharon Ellis ◽  
Roy Cross ◽  
James Harrison Hodgson
Keyword(s):  
Nitric Oxide ◽  
Nitrous Oxide ◽  
Crop Residues ◽  
Sandy Loam ◽  
Sandy Loam Soil ◽  
Arable Crop ◽  
Loam Soil

Primary varicose veins

Phlebologie ◽  
2010 ◽  
Vol 39 (03) ◽  
pp. 133-137
Author(s):  
H. Partsch
Keyword(s):  
Varicose Veins ◽  
Compression Therapy ◽  
Daily Practice ◽  
Clinical Severity ◽  
Compression Stockings ◽  
Primary Varicose Veins ◽  
The Cost ◽  
Convincing Data ◽  
Long Term Studies

SummaryBackground: Compression stockings are widely used in patients with varicose veins. Methods: Based on published literature three main points are discussed: 1. the rationale of compression therapy in primary varicose veins, 2. the prescription of compression stockings in daily practice, 3. studies required in the future. Results: The main objective of prescribing compression stockings for patients with varicose veins is to improve subjective leg complaints and to prevent swelling after sitting and standing. No convincing data are available concerning prevention of progression or of complications. In daily practice varicose veins are the most common indication to prescribe compression stockings. The compliance depends on the severity of the disorder and is rather poor in less severe stages. Long-term studies are needed to proof the cost-effectiveness of compression stockings concerning subjective symptoms and objective signs of varicose veins adjusted to their clinical severity. Conclusion: Compression stockings in primary varicose veins are able to improve leg complaints and to prevent swelling.

Diatoms and aquatic palynomorphs in the sediments of the Eurasian Arctic seas and their significance for paleooceanological investigations in the Arctic

2019 ◽  
pp. 246-251
Author(s):  
Yelena I. Polyakova ◽  
Yekaterina I. Novichkova ◽  
Tatiana S. Klyuvitkina ◽  
Elizaveta A. Agafonova ◽  
Irina M. Kryukova
Keyword(s):  
Bering Sea ◽  
Surface Sediments ◽  
Sea Water ◽  
The Arctic ◽  
Marginal Filter ◽  
Arctic Seas ◽  
Hydrological Parameters ◽  
The Arctic Ocean ◽  
Long Term Studies

Presented the results of long-term studies of diatoms and aquatic palynomorphs in surface sediments of the Arctic seas and the possibility of their use for the reconstructions of paleocirculation water masses, advection of Atlantic and Bering sea water into the Arctic ocean, changes in the river runoff to the seas, sedimentary processes in the marginal filter of the largest rivers, seasonal sea ice cover and other hydrological parameters.

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