scholarly journals Influence of formulation of elemental S fertilizer on yield, quality and S uptake of canola seed

2005 ◽  
Vol 85 (4) ◽  
pp. 793-802 ◽  
Author(s):  
S. S. Malhi ◽  
E. D. Solberg ◽  
M. Nyborg
Keyword(s):  
Ammonium Sulphate ◽  
Seed Yield ◽  
Protein Concentration ◽  
N Uptake ◽  
First Year ◽  
Canola Seed ◽  
S Uptake ◽  
Percent Recovery ◽  
Oil Concentration ◽  
S Fertilizers

The rate of S oxidation in elemental S fertilizers to plant-available sulphate-S depends on factors that affect microbial activity, such as soil moisture, temperature, aeration and size of fertilizer granules. Three field experiments were conducted on S-deficient Gray and Dark Gray Luvisol soils (Typic Cryoboralf) during 2000 and 2001 in Saskatchewan (exp. 1 at Porcupine Plain and exp. 3 at Canwood) and Alberta (exp. 2 at Legal) to determine the effects of formulation of elemental S fertilizers on yield, oil, protein and S concentration, S uptake, percent recovery of applied S and N uptake in seed of canola (Brassica napus L. ‘A4573’ at Porcupine Plain and ‘Invigor 2663’ at Legal and Canwood). In exp. 1 (2000 and 2001) and exp. 2 (2000), treatments included five elemental S fertilizers (granular ES-99, ES-95, ES-90 and Biosul-90; and Biosul-50 suspension), granular potassium sulphate and zero-S control. In exp. 3, treatments included eight elemental S fertilizers (granular ES-99, ES-95, ES-90 and Biosul-90; powder Lab fine ES-99.5, ES Settle-47 and ES SPB571-85.8; and Biosul-50 suspension), 21.7% elemental S plus 18.7% sulphate-S (Agrium Plus), blend of granular ES-90 and ammonium sulphate (1:1), granular ammonium sulphate and zero-S control. The S fertilizers were surface-broadcast or sprayed at 15 and 30 kg S ha-1 rates within 2–3 d after sowing in spring. Canola plants in the zero-S treatment showed S deficiency in the growing season, and seed yield increased with sulphate-S fertilizer by 21.8, 1.4, and 3.6 times in exps. 1, 2, and 3, respectively. There was little effect of S fertilizer on protein concentration in seed. Biosul-50 suspension in all experiments and powder forms of elemental S fertilizers, used only in exp. 3, were almost as effective as sulphate-S fertilizers. In all experiments, granular elemental S fertilizers had no or only a very small effect on yield, S uptake, percent recovery of applied S, N uptake, oil concentration, S concentration and protein concentration of canola seed in the first year of application. In the second year of exp. 1, granular elemental S fertilizers tended to increase yield, S uptake, N uptake, oil concentration, and S concentration of canola seed, but none of them produced seed yield or improved other parameters of canola seed comparable with the sulphate-S and elemental S powder or suspension fertilizers. In summary, granular elemental S fertilizers were not effective in increasing canola seed yield and S uptake on S-deficient soils in the first year of application. After the second annual application, most granular elemental S fertilizers tended to correct deficiency of S in canola plants, but improvements in yield and other parameters of seed were still less than the sulphate-S and suspension or powder forms of elemental S fertilizers. Key words: Canola, elemental and sulphate S fertilizers, granular, suspension, oil and protein content, seed yield, S uptake

scholarly journals Influence of four successive annual applications of elemental S and sulphate-S fertilizers on yield, S uptake and seed quality of canola

2005 ◽  
Vol 85 (4) ◽  
pp. 777-792 ◽  
Author(s):  
S. S. Malhi
Keyword(s):  
Ammonium Sulphate ◽  
Seed Yield ◽  
Best Management Practices ◽  
Protein Concentration ◽  
Management Practices ◽  
Seed Quality ◽  
Straw Yield ◽  
Plant Soil ◽  
S Uptake ◽  
S Fertilizers

The effectiveness of elemental S fertilizers in increasing crop yield in S-deficient soils depends on the rate at which S is oxidized to sulphate in soil for plant uptake. A 4-yr field experiment (1999 to 2002) was conducted with canola (Brassica napus L. or Brassica rapa L.) on a S-deficient loamy sand Gray Luvisol soil near Tisdale in northeastern Saskatchewan to determine the effectiveness of elemental S and sulphate-S fertilizers applied annually at different times and S rates on seed and straw yield, oil and protein concentration in seed, concentration and uptake of S in seed and straw, amount of residual sulphate-S in soil, and recovery of applied S in plant, soil and plant + soil. The S fertilizer treatments included granular types of two bentonite -elemental S fertilizers (ES-90 and ES-95), one sulphate-S (ammonium sulphate), one containing elemental S and sulphate-S (Agrium Plus), and a zero-S control. The S fertilizers were surface-broadcast at 10 or 20 kg S ha-1 rates in the previous autumn or in spring, and incorporated into the soil a few days prior to seeding in May. Canola plants in the zero-S control showed S deficiency in the growing season. Seed yield, straw yield, oil concentration in seed, and S concentration and uptake in seed and straw increased with the sulphate-S fertilizer in all years. There was no significant increase in seed yield from the elemental S fertilizers in 1999, though autumn application tended to give slightly greater seed yield than the spring application. Elemental S fertilizers usually increased seed yield and S uptake significantly over the zero-S control, but yield and S uptake were less than the sulphate-S fertilizer in most cases in 2000, in many cases in 2001 and in some cases in 2002, especially when the S fertilizers were applied in spring. Autumn-applied elemental S usually had greater seed yield and S uptake than the spring-applied elemental S in 2000, 2001 and 2002. On the other hand, autumn-applied ammonium sulphate produced or tended to produce lower seed yield and S uptake than spring-applied ammonium sulphate in some cases. There was little effect of S fertilizer application on protein concentration in seed. In summary, the results indicated that elemental S fertilizers were not effective in increasing canola yield and S uptake on the S-deficient soil in the first year of application. The elemental S fertilizers became effective in the second to fourth year, but seed yield and S uptake were still less than those obtained with sulphate-S fertilizer, particularly when the S fertilizers were applied in spring. The findings suggest the need for research on best management practices to improve effectiveness of elemental S fertilizers. Key words: Canola, elemental and sulphate S fertilizers, oil and protein concentration, seed yield, sulphur uptake

scholarly journals Influence of six successive annual applications of sulphur fertilizers on wheat in a wheat–canola rotation on a sulphur deficient soil

2009 ◽  
Vol 89 (4) ◽  
pp. 629-644 ◽  
Author(s):  
S S Malhi ◽  
J J Schoenau ◽  
C L Vera
Keyword(s):  
Ammonium Sulphate ◽  
Seed Yield ◽  
Protein Concentration ◽  
Seed Protein ◽  
Wheat Yield ◽  
Residual Effects ◽  
Straw Yield ◽  
S Uptake ◽  
Seed Protein Concentration ◽  
S Fertilizers

A 9-yr (1999–2007) field experiment was conducted on a S-deficient Gray Luvisol (Typic Cryoboralf) loam soil at Porcupine Plain in northeastern Saskatchewan. The objective was to compare the influence of six successive annual applications (1999–2004) and the following residual effects for 3 yr (2005–2007) of elemental S and sulphate-S fertilizers on yield, seed protein and total S concentration, and S uptake of wheat (Triticum aestivum L.) in a wheat–canola rotation. Treatments used were combinations of two application times (preceding autumn and before seeding in spring) with two granular elemental S fertilizers (ES-90 and ES-95), one fertilizer containing both elemental S and sulphate-S (Agrium Plus), ammonium sulphate, and a zero-S control. The S fertilizers were applied annually at a rate of 15 kg S ha–1. From 1999 to 2004, seed yield (3 yr) and straw yield (4 yr), seed protein concentration (3 yr), total S concentration in seed (4 yr), and S uptake in seed (5 yr) and straw (5 yr) of wheat showed significant response to S fertilization. In the first year (1999), ammonium sulphate and Agrium Plus were more effective than ES-90 and ES-95. In the following years (2000–2004), there was no significant effect of S source on seed and straw yield. Sulphate-S containing fertilizers produced greater total S concentration in seed and S uptake in straw (3 yr) and for S uptake in seed (1 yr). There was no effect of timing of S application on seed yield and protein concentration in any year, but autumn application was superior to spring application for straw yield and S uptake (1 yr), and for seed total S concentration and S uptake (2 yr). Residual effects of six previous S applications showed improvement in wheat seed yield until 2006, and straw yield and total S uptake until 2007. Elemental S, especially when applied in autumn, tended to have more lasting residual effects than the other S fertilizer treatments. There was some build-up of residual sulphate-S in soil in almost all S fertilizer treatments after four successive applications, but this was generally higher with sulphate-S-containing fertilizers. Recovery of applied S from 1999 to 2004 in plants was usually higher with sulphate-S fertilizer than with elemental S fertilizer in most years. Recovery of applied S in soil was higher for sulphate-S fertilizers, followed by ES-90, and finally ES-95. Residual nitrate-N in soil was significantly lower in spring-applied ammonium sulphate treatment than the zero-S or other S treatments. Key words: Elemental S, fertilizer, protein concentration, S uptake, sulphate-S, wheat, yield

Effects of foliar-applied nitrogen fertilizer on oilseed rape (Brassica napus)

2013 ◽  
Vol 153 (1) ◽  
pp. 42-55 ◽  
Author(s):  
C. A. WHITE ◽  
S. E. ROQUES ◽  
P. M. BERRY
Keyword(s):  
Oilseed Rape ◽  
Seed Yield ◽  
Field Experiments ◽  
N Uptake ◽  
Yield Increase ◽  
Uptake Efficiency ◽  
Foliar N ◽  
Seed Protein Concentration ◽  
Oil Concentration ◽  
The Uk

SUMMARYThe aim of the present study was to evaluate the effects on yield, oil concentration and nitrogen (N) uptake efficiency of N fertilizer applied to the foliage of oilseed rape during and soon after flowering. Four field experiments were conducted in the UK during the 2008/09 and 2009/10 seasons which investigated six rates of soil-applied N (ammonium nitrate) ranging from 0 to 280 or 320 kg N/ha with each treatment followed by 0 or 40 kg/ha of foliar N applied as a solution of urea at the end of flowering. Each experiment also investigated five rates of foliar N ranging from 0 to 120 kg N/ha applied at the end of flowering and five timings of foliar N (40 kg N/ha) from mid-flowering to 2 weeks after the end of flowering.Foliar N at 40 kg N/ha applied at the end of flowering significantly increased the seed yield in three of the four experiments. The seed yield increase across all four experiments was 0·25 t/ha (range of 0–0·41 t/ha). In two experiments, the increase in seed yield in response to foliar N occurred irrespective of whether it followed sub-optimal or super-optimal rates of soil-applied N; in one experiment there was a greater response at sub-optimal soil-applied N rates. The foliar N treatment reduced the seed oil concentration by 11 g/kg and increased seed protein concentration by 11 g/kg. Similar yield responses were observed for foliar N applications between mid-flowering and 2 weeks after the end of flowering. The efficiency with which foliar N was taken up into the plant varied between 0 and 100% with an average uptake efficiency across the four experiments of 61%.

Sulphur fertilizer and tillage effects on canola seed quality in the Black soil zone of western Canada

2003 ◽  
Vol 83 (4) ◽  
pp. 745-758 ◽  
Author(s):  
C. A. Grant ◽  
G. W. Clayton ◽  
A. M. Johnston
Keyword(s):  
Ammonium Sulphate ◽  
Seed Quality ◽  
Conventional Tillage ◽  
Black Soil ◽  
Residual Effects ◽  
Wheat Crop ◽  
Canola Seed ◽  
N Concentration ◽  
Oil Concentration ◽  
Canola Quality

Field studies in Manitoba, Saskatchewan and Alberta over 3 yr evaluated immediate and residual effects of source, timing and placement of su lphur (S) fertilizers on canola quality under reduced (RT) and conventional tillage (CT). Oil concentration of canola seed increased and chlorophyll content decreased with application of plant-available forms of S fertilizer if soils were deficient in available sulphate-S. Therefore, canola seed quality was improved by correction of S deficiencies. The magnitude and consistency of fertilizer effects reflected the sulphate availability of the fertilizer source applied, with ammonium sulphate having a greater effect than the bentonite-elemental S product, Tiger 90®, in the year of application. Effects on seed N concentration were inconsistent, but decreases in seed N concentration occasionally occurred with correction of an S deficiency, reflecting an inverse relationship between seed yield or seed oil concentration and seed N concentration. Seed S concentration generally increased with increases in available sulphur. Application of ammonium sulphate in the preceding wheat crop provided residual sulphate-S for canola, leading to increased oil and seed S concentration, and decreased chlorophyll and seed N concentration. Tillage system had little influence on canola quality, with RT occasionally reducing oil concentration and increasing chlorophyll and seed N content. The response of seed quality to S fertilization was similar under CT and RT. Sulphate-S sources consistently improved canola quality on S-deficient fields. Key words: Bentonite S, chlorophyll, elemental S, green seed. zero oil, protein, zero tillage

Management of nitrogen and phosphorus fertilizer in no-till flax

2003 ◽  
Vol 83 (4) ◽  
pp. 681-688 ◽  
Author(s):  
G. Lafond ◽  
C. Grant ◽  
A. Johnston ◽  
D. McAndrew ◽  
W. May
Keyword(s):  
Seed Yield ◽  
Seed Oil ◽  
Seed Quality ◽  
N Uptake ◽  
P Uptake ◽  
Fertilizer Placement ◽  
Management Options ◽  
Crop Establishment ◽  
Oil Concentration ◽  
P Placement

The major flax-growing areas of Canada coincide with areas where large shifts towards conservation tillage have occurred. These shifts have also brought about major changes in the way fertilizer is applied. The objective of this study was to determine the combination of nitrogen fertilizer form and N and P fertilizer placement methods that can increase N and P uptake, seed yield and seed oil concentration and composition in flax. The study was conducted at four locations covering the flax-growing areas over a 3-yr period. Three fertilizer forms, ammonium nitrate (AN), ammonium sulphate (AS) and urea were compared using different placement methods, pre-plant band (Pp) or side-band (Sb) in combination with monoammonium phosphate in either a Pp, Sb or seed-placed (Sp) position. Plant uptake of N and P was measured at 7, 14, 21 and 28 d after crop emergence and at the start of flowering. Other variables collected included crop establishment, crop yield and seed oil concentration and composition. AS resulted in the highest N uptake followed by AN then urea. As well, AS in the Sb showed higher N uptake than when applied Pp. The largest uptake of P was observed on days 7, 14 and 21 when AS and P were placed together in an Sb position. Crop establishment was adversely affected by urea and least by AN and AS, indicating that adequate seed-fertilizer separation between urea and flax seed is critical to minimizing reductions in plant stands. N form and placement, and P placement had no effect on seed oil concentration and composition in this study. Seed yield was improved marginally, overall, with the addition of P, while changes in N and P placement had no overall yield benefits. Treatments that resulted in improved N and P uptake in the first 21 d after crop emergence did not result in improved seed yields. When site × year interactions were investigated, 2 of 12 site years showed better yields when N and P were placed together in the Sb position. Based on the results of this study, we conclude that flax growers have many agronomically acceptable N and P management options available. Key words: Linum usitatissimum L., fertilizer placement, fertilizer form, nutrient uptake, seed yield, seed quality, oil quantity, urease inhibitor, Agrotain™

Effects of four consecutive annual applications of elemental S and sulphate-S fertilizers on yield, S uptake and seed quality of wheat

2006 ◽  
Vol 86 (2) ◽  
pp. 399-412 ◽  
Author(s):  
S. S. Malhi
Keyword(s):  
Ammonium Sulphate ◽  
Seed Protein ◽  
Seed Quality ◽  
Wheat Yield ◽  
Triticum Aestivum L ◽  
Significant Response ◽  
S Uptake ◽  
Seed Protein Concentration ◽  
S Fertilizers

A field experiment from 1999 to 2002 was carried out near Tisdale in northeastern Saskatchewan on a S-deficient Gray Luvisol (Typic Cryoboralf) soil to compare the effects of elemental S and sulphate-S fertilizers on yield, seed protein, total S concentration, S uptake, and recovery of applied S in wheat (Triticum aestivum L.) and residual SO4-S in soil. Treatments were combinations of 10 and 20 kg S ha-1 rates applied in autumn and spring for two granular bentonitic elemental S fertilizers (ES- 90 and ES-95), one fertilizer containing both elemental S and sulphate-S (Agrium Plus), and ammonium sulphate, plus a zero-S control. The S fertilizers were surface-broadcast and all plots had a preseeding rotovation in spring to incorporate fertilizers into the soil. Seed (1 yr) and straw (3 yr) yield, seed protein concentration (1 yr), and total S concentration and S uptake in seed and straw (all years except uptake of S in seed in 2001 and 2002) showed significant response to S fertilization. Ammonium sulphate and Agrium Plus were generally more effective compared with the elemental S fertilizers, when there was a significant response to sulphate-S containing fertilizers. Autumn application of elemental S fertilizers was sometimes more effective than spring application, while an opposite trend was observed for sulphate-S containing fertilizers in some cases. The increase in S rate from 10 to 20 kg S ha-1 tended to increase the measured wheat parameters in many elemental S treatments, but for sulphate-S fertilizers the effect was less pronounced. The concentration of total S in seed and straw was relatively more responsive to S fertilization than yield and S uptake, particularly for seed. The effect of S fertilization on wheat was less pronounced in drought years, particularly on seed yield, suggesting that drought rather than S availability was limiting wheat growth. There was some build-up of residual SO4-S in the 0-60 cm depth of soil in many S fertilizer treatments after four successive applications, but there was little or no difference in soil SO4-S between elemental S and sulphate-S fertilizers. In conclusion, the results from four successive annual applications of elemental S and sulphate-S fertilizers in autumn and spring on the same area indicate that bentonitic granular elemental S fertilizers had comparatively less influence on wheat than granular sulphate-S fertilizers and further research to improve the effectiveness of these elemental S fertilizers is suggested. Key words: Elemental S, fertilizer, protein, seed quality, sulphate-S, wheat, yield

Nitrogen and sulfur application effects on camelina seed yield, fatty acid composition, and nutrient removal

2020 ◽  
Author(s):  
Eric Obeng ◽  
Augustine K. Obour ◽  
Nathan O. Nelson ◽  
Ignacio Antonio Ciampitti ◽  
Donghai Wang
Keyword(s):  
Fatty Acid ◽  
Seed Yield ◽  
Nutrient Removal ◽  
Protein Concentration ◽  
N Fertilizer ◽  
Oil Concentration ◽  
Use Efficiency ◽  
Camelina Seed ◽  
Fertilizer Rates ◽  
S Application

Effective management of nitrogen (N) and sulfur (S) in camelina [Camelina sativa (L.) Crantz] production is important to ensure optimum seed yield and oil composition. The objectives of this study were to determine camelina seed yield, oil concentration, estimate nutrient removal and N use efficiency as influenced by N and S application. Field experiments were conducted to evaluate S rates (0 and 20 kg ha-1) and N fertilizer rates (0, 22, 45 and 90 kg ha-1) effect on camelina productivity and fatty acid composition over two growing seasons (2014 and 2015). Results showed S application had no effect on seed yield and oil concentration. Averaged across N rates, protein concentration increased with S application compared to the control. Seed yield showed quadratic response to N fertilizer application with maximum yield occurring at 54 kg N ha-1. However, economic optimum N rate ranged from 18 to 43 kg N ha-1. Nutrient removal, protein concentration, protein and oil yield, and estimated biodiesel was maximum at 45 kg N ha-1. The maximum amounts of N, phosphorus (P), potassium (K) and S removed were 49, 8, 10, and 7 kg ha-1, respectively. Nitrogen use efficiency (NUE) and agronomic efficiency (NAE) decreased when N fertilizer rates were above 22 kg N ha-1. Application of N or S had no effect on proportions of saturated fatty acid (SFA), monounsaturated fatty acid (MUFA), and polyunsaturated fatty acids (PUFA). Our findings suggest camelina required 18 to 43 kg N ha-1 when grown in rain-fed systems in water-limited environments.

Cultivar and fertilizer S rate interaction effects on canola yield, seed quality and S uptake

2006 ◽  
Vol 86 (1) ◽  
pp. 91-98 ◽  
Author(s):  
S. S. Malhi ◽  
K. S Gill
Keyword(s):  
Protein Concentration ◽  
Seed Quality ◽  
Yield Potential ◽  
Yield Response ◽  
Brassica Napus L ◽  
Straw Yield ◽  
S Deficiency ◽  
S Uptake ◽  
Oil Concentration ◽  
Rate Interaction

Since canola has a high requirement for S, and canola cultivars have differences in growth rate and yield potential, a differential response of canola cultivars to soil S deficiency and S fertilization can be expected. A 3 site-year field study was conducted on S-deficient soils in northeastern Saskatchewan to determine response of four canola cultivars to S deficiency and S fertilization in terms of yield (seed and straw), seed quality (oil, protein and S concentration), and S uptake (seed and straw). Two Brassica napus L. cultivars (Quantum and AC Excel) and two B. rapa L. cultivars (Maverick and AC Parkland) were compared at 0, 5, 10, and 15 kg S ha-1 rates. Both the actual values of seed and straw yield and seed S uptake and the responses to S fertilization were greater for the B. napus than B. rapa cultivars. Optimal yield response for all the four cultivars occurred at the 10 kg S ha-1 rate, though seed quality and S uptake responded up to the 15 kg S ha-1 rate. Sulphur fertilization response was quadratic for seed and straw yield, seed oil and protein concentration, and S uptake in seed, while the response for seed S concentration and straw S uptake was inconsistent. In summary, in spite of differences in magnitude of the response of tested cultivars to S fertilization, the similar nature of the response and optimal yield at the same S rate indicated th at specific S fertilization recommendations for individual canola cultivars are unnecessary. Key words: Canola cultivars, oil concentration, seed quality, S rates, S uptake, yield

Residual management of sulfur applied to soybean or wheat in a soybean - wheat system on Vertisols

Soil Research ◽  
1997 ◽  
Vol 35 (1) ◽  
pp. 199 ◽  
Author(s):  
A. N. Ganeshamurthy ◽  
P. N. Takkar
Keyword(s):  
Seed Yield ◽  
Critical Level ◽  
Residual Effect ◽  
Residual Effects ◽  
Wheat Crop ◽  
First Year ◽  
Soil Test ◽  
Regression Equations ◽  
S Uptake ◽  
Seed Yields

In a 3-year experiment on a typic Haplustert low in soil test sulfur (S), residual effects of S applied to either soybean or wheat in a soybean–wheat system were measured for seed yields, recoveries of added S, and changes in the soil test S. Sulfur as gypsum was applied at 5 rates (0–80 kg S/ha) to soybean and 4 rates (0–60 kg S/ha) to wheat during the first year. In subsequent years the residual effects were studied in relation to fresh application of 40 kg S/ha to each crop. Seed yields of soybean and wheat were increased significantly by the application of S to each crop. The rate 80 kg S/ha applied to soybean showed residual effects in 2 succeeding crops, while 60 kg S/ha applied to soybean or wheat showed residual effect in only 1 succeeding crop. The S applied to wheat was more effciently utilised than that applied to soybean in rotation. The rates 53 and 70 kg S/ha (calculated via regression equations) applied to soybean gave 90% of the seed yield of freshly applied S at 40 kg/ha in the succeeding wheat and soybean crops, respectively, and 57 kg S/ha applied to the wheat crop gave 90% of the seed yield in the succeeding soybean crop. The recoveries of added S were greater with smaller rates of added S and were greater in the first 2 residual crops. Soil test S was adequate only in the first year and fell below critical level in the subsequent cropping period. Cumulative S uptake determined the levels of available S in the soil.

Nitrogen fertilizer placement for fall and spring seeded Brassica napus canola

2002 ◽  
Vol 82 (1) ◽  
pp. 15-20 ◽  
Author(s):  
A. M. Johnston ◽  
E. N. Johnson ◽  
K. J. Kirkland ◽  
F. C. Stevenson
Keyword(s):  
Brassica Napus ◽  
Seed Yield ◽  
Seed Weight ◽  
Protein Concentration ◽  
Early Spring ◽  
N Fertilizer ◽  
Seedling Density ◽  
Fertilizer Placement ◽  
Seeding Date ◽  
Oil Concentration

Brassica napus L. canola seeded in the fall (dormant) just prior to freeze-up, or in the early spring as soon as fields are passable, can improve productivity in semiarid regions on the Canadian prairies. The objective of this study was to assess N fertilizer placement options for alternative canola seeding dates. Herbicide-tolerant B. napus canola (cv. Quest) seedling density, phenological development, seed yield, seed weight, oil concentration, and protein concentration were assessed for four N (urea) placement options [banded prior to fall seeding date (only Melfort), broadcast in early-spring, side banded, and seed placed] and three seeding dates (late October, mid- to late April, and mid-May) at Scott and Melfort, SK, Canada. Nitrogen fertilizer placed with the seed often reduced seedling density. At Melfort, seed placed N fertilizer reduced the seed yield (10%), seed oil concentration (4%) and increased protein concentration (5%) of fall and mid-May seeded canola. The other N fertilizer placement options consistently maintained the highest level of canola production for all seeding dates. At Scott, seeding canola in fall or April generally maintained adequate plant stands, and often increased seed yield (43%), seed weight (18%), and oil concentration (5%) , when compared with the mid-May seeding date. Our results indicate that N fertilizer placement considerations used for the more traditional mid-May seeding date should be similar for canola dormant or April seeded. Current N fertilizer placement options, such as side banding, pre-plant banding or early-spring broadcasting, are options that resulted in equivalent crop yield responses. Given the variability in crop yield response measured with seed placement of N, we recommend that this practice should be a voided. Key words: Seeding date, dormant, direct seeding, alternative cropping practice, N fertilizer management

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