Short-term and residual contribution of selected elemental S fertilizers to the S fertility of two Luvisolic soils

1991 ◽  
Vol 71 (2) ◽  
pp. 203-211 ◽  
Author(s):  
H. H. Janzen ◽  
R. E. Karamanos
Keyword(s):  
Ammonium Sulfate ◽  
Elemental Sulfur ◽  
Slow Release ◽  
Residual Effect ◽  
S Deficiency ◽  
Fertilizer Recommendations ◽  
Residual Contribution ◽  
Term Maintenance ◽  
S Fertilizers

A 3-yr program was carried out in central Alberta to evaluate the immediate and residual contributions of various fertilizer sulfur sources to the pool of plant-available sulfate in soil. Three elemental sulfur products, a finely-divided suspension and two elemental sulfur + bentonite products, and ammonium sulfate were applied at various rates (0–120 kg S ha−1) in factorial arrangement with various supplemental rates of sulfate (0–40 kg S ha−1). Temporal patterns of plant-available sulfur release varied significantly among fertilizer S sources, suggesting different agronomic niches for the various forms. While ammonium sulfate and the finely divided S suspension provided almost immediate correction of S deficiency, the S-bentonite products appeared be better suited to long-term maintenance of soil S fertility. The relatively slow release of plant-available S in the latter products was attributed to ineffective dispersion of the products in the soil. These slow-release characteristics need to be considered in the formulation of fertilizer recommendations on soils previously amended with S-bentonite products. Key words: Oxidation, plant availability, residual effect, S fertilizers

scholarly journals Modelling the residual N effect of slurry applied to maize land on dairy farms in the Netherlands

1997 ◽  
Vol 45 (4) ◽  
pp. 477-494 ◽  
Author(s):  
J.J. Schroder ◽  
H. Van Keulen
Keyword(s):  
Time Course ◽  
Residual Effect ◽  
Mineral Fertilizer ◽  
Fine Tuning ◽  
Organic N ◽  
Mineralization Rate ◽  
Silage Maize ◽  
Fertilizer Recommendations ◽  
Residual N Effect

The decomposition rate of soil organic N was estimated from data of a long-term field experiment and used in a simulation model. Subsequently, the model was used to estimate the effects of Dutch manuring practice on maize land. The time course of the N mineralization rate was estimated for three scenarios: (i) following actual manure applications which have declined with time (scenario A); (ii) assuming continuous applications in accordance with the present and anticipated legislation (scenario P); (iii) assuming annual applications of 200 kg mineral fertilizer N/ha only (scenario M). The actual mineralization rate (following scenario A) in 1995 was estimated at 23-31 kg N/ha higher than when manure had been applied at moderate rates (following scenario P). Corresponding estimates for the year 2005 were 18-19 kg N/ha per year. The calculations suggest that it may be difficult to maintain soil organic N pools with mineral fertilizer only. Consequently, the mineralization rate following scenario M decreased with time as did the yields of silage maize. The magnitude of the residual effect indicates that there is need and scope for fine tuning of N fertilizer recommendations. The simple model used seems suitable for exploring the magnitude of the residual effect of manures.

SOURCES OF SULFUR FOR RAPESEED

1981 ◽  
Vol 61 (2) ◽  
pp. 465-467 ◽  
Author(s):  
E. J. NOELLEMEYER ◽  
J. R. BETTANY ◽  
J. L. HENRY
Keyword(s):  
Ammonium Sulfate ◽  
Dry Matter ◽  
S Deficiency ◽  
S Fertilizers

Rapeseed grown in pots on a S-deficient soil showed little response to elemental S fertilizers applied at rates of up to 150 ppm S. The dry matter yields, percent S and N/S ratios of the aboveground material indicated severe S deficiency in the crop. A readily available S source (ammonium sulfate) at rates of 75 and 30 ppm S increased yield by three to five times over that produced by the highest rates of elemental S.

Crop response to elemental sulfur fertilizers in central Alberta

1991 ◽  
Vol 71 (2) ◽  
pp. 213-225 ◽  
Author(s):  
R. E. Karamanos ◽  
H. H. Janzen
Keyword(s):  
Crop Production ◽  
Elemental Sulfur ◽  
Slow Release ◽  
Western Canada ◽  
Sulfur Deficiency ◽  
Crop Response ◽  
Short Term ◽  
S Deficiency ◽  
Key Words Barley ◽  
Sulfur Fertilizers

Sulfur deficiency has become a widespread limitation to crop production in western Canada. A variety of S sources are commercially available to alleviate these deficiencies but not all are equally effective. Three elemental S products (a finely-divided suspension and two elemental S + bentonite) and ammonium sulfate were compared over a 3-yr period in central Alberta. These products were applied to barley and canola at various rates (0–120 kg S ha−1) in a factorial arrangement with various supplemental rates of sulfate-S (0–40 kg ha−1) in two experiments Fertilizers affording effective and reliable alleviation of S deficiency in the year of application included sulfate forms and finely-divided elemental S products that can be readily mixed into the soil. The residual benefits of the various fertilizer products examined appeared to be comparable despite large differences in short-term availability. The absence of appreciable residual advantage of slow-release elemental S products was attributed to the short duration of S assimilation by canola and barley and the susceptibility to leaching of S oxidized after that period. Key words: Barley, canola, residual, rotation, S fertilizer, uptake, yield

A review of sulphur fertilizer management for optimum yield and quality of canola in the Canadian Great Plains

2005 ◽  
Vol 85 (2) ◽  
pp. 297-307 ◽  
Author(s):  
Sukhdev S. Malhi ◽  
Jeff J. Schoenau ◽  
Cynthia A. Grant
Keyword(s):  
Seed Yield ◽  
Seed Quality ◽  
Growing Season ◽  
Future Research ◽  
Long Term Effects ◽  
Yield And Quality ◽  
S Deficiency ◽  
S Fertilizers

In the Parkland region of the Canadian prairies, Canola (Brassica napus L. or Brassica rapa L.) is an important cash crop. Canola has a high requirement for sulphur (S). However, many soils in this region are deficient or potentially deficient in plant-available S for optimum canola seed yield. Application of sulphate-S at about 15–30 kg S ha-1 is usually sufficient to prevent S deficiency in canola on most of the S-deficient soils. Application of sulphate-S to canola at seeding time gives the highest increase in yield and S uptake. Deficiencies of S in canola plants can be prevented and/or corrected and seed yield improved with the use of sulphate-S fertilizers in the growing season. Application of sulphate-S at bolting can substantially restore seed yield, while an application at early flowering can moderately correct S deficiency damage. Side-banding is the most effective way to apply sulphate-S fertilizers to produce maximum seed yield and to prevent any damage to canola seedlings from seed-row placement. In relatively moist areas, broadcast-incorporation methods can produce seed yield similar to side-banding in most years. Elemental S fertilizers were not effective in increasing seed yield in the year of application, and were generally less effective than sulphate-S fertilizer even after multiyear annual applications, especially when applied in spring. Autumn-applied elemental S was more effective than spring-applied elemental S. Banding delayed availability of elemental S as compared to broadcast application. Use of granular elemental S products is not reliable for optimum seed yield of canola under Canadian prairie conditions on S-deficient soils, particularly in the initial year and with spring application or band placement. Elemental S fertilizers may have a role to maintain or build-up sulphate-S levels in soils marginally low in S where residual benefits are desirable, but management decisions should consider both immediate and long-term effects of S fertilizer on seed yield, seed quality and economics. The findings suggest the need of future research to increase dispersion and distribution of S particles from granules for faster oxidation of elemental S in soil, and to develop elemental S fertilizer products/formulations that can be used on a commercial scale to prevent and/or correct S deficiency in the growing season to optimize seed yield and quality of canola. Research is also required to determine the long-term effects of balanced application of S with other nutrients on soil quality, accumulation and distribution of nitrate-N, sulphate-S and other nutrients in the soil profile, efficiency of nutrient, water and energy use, and crop diseases. More research should be conducted in relation to soil/plant tissue testing issues for optimum seed yield and quality of canola. Key words: Balanced fertilization, canola, elemental S fertilizers, method of application, rate of S, seed quality, seed yield, sulphate-S fertilizers

Efficacious long-term maintenance therapy with pantoprazole (PAN) in patients with Zollinger-Ellison syndrome

2001 ◽  
Vol 120 (5) ◽  
pp. A613-A613
Author(s):  
P BORNMAN ◽  
K RADEBOLD ◽  
H DEBAERE ◽  
L VENTER ◽  
H HEINZE ◽  
...  
Keyword(s):  
Maintenance Therapy ◽  
Zollinger Ellison Syndrome ◽  
Term Maintenance
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