Seeding rate, fertilizer level and disease management effects on hybrid versus open pollinated canola (<i>Brassica napus</i> L.)

Brandt, S.A.; Malhi, S.S.; Ulrich, D.; Lafond, G. P.; Kutcher, H. Randy; Johnston, Adrian

doi:10.4141/p05-223

Cited by 60 publications

(67 citation statements)

References 16 publications

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“…The effect of seed rate on the emergence m -2 of canola might be due to more seedlings emerged due to higher number of seeds sown. These results are in line with those of [17] who concluded that increasing seeding rate increased emergence in canola. In case of varieties, maximum emergence -2 was observed in Zahoor Swati as compared to Durr-e-NIFA.…”

Section: Figure 1 Biological Yield (Kg Ha -1 ) Of Canola As Affectedsupporting

confidence: 83%

Growth and yield attributes of canola varieties under different seed rates

Jawad¹

2017

PAB

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A field experiment was conducted at Bacha Khan University Agricultural Research Farm, Bacha Khan University Charsadda, during winter-2015 to determine the growth and yield attributes of canola varieties under different seed rates. Four seed rates (4, 6, 8 and 10 kg ha -1 ) and two varieties (Durr-e-NIFA and Zahoor Swati) were tested in the experiment. The experiment was laid out in a randomized complete block design with three replications. Net plot size was 3m x 2m having 5 rows with row to row distance of 40cm. Recommended dose of NP (60 & 75 kg ha -1 ) was applied. All the P was applied at sowing time while N was applied in split doses (Half at the time of sowing and the remaining half in first irrigation). All other agronomic practices were equally maintained for all plots. The results showed that maximum emergence m -2 (97), days to maturity (165), plant height (149 cm), biological yield (3709 kg ha -1 ) and grain yield (2170 kg ha -1 ) was produced at seed rate of 10 kg ha -1 . Maximum 1000-grains weight (3.92 g) was produced at the seed rate of 4 kg ha -1 . Maximum emergence m -2 (82) was recorded for the variety Zahoor Swati. The variety Durr-e-NIFA produced maximum plant height (145 cm) and 1000-grains weight (3.69 g). Biological yield (3751 kg ha -1 ) and grain yield (2228 kg ha -1 ) increased with increasing seed rate from 4 to 10 kg ha -1 in case of Durr-e-NIFA variety.

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Section: Figure 1 Biological Yield (Kg Ha -1 ) Of Canola As Affectedsupporting

confidence: 83%

Growth and yield attributes of canola varieties under different seed rates

Jawad¹

2017

PAB

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“…This is consistent with other studies completed in western Canada (Karamanos et al 2005;Brandt et al 2007;Gan et al 2007;). …”

Section: Seed and Seed Nitrogen Yieldssupporting

confidence: 82%

Optical sensors have potential for determining nitrogen fertilizer topdressing requirements of canola in Saskatchewan

Holzapfel¹,

Lafond²,

Brandt³

et al. 2009

Can. J. Plant Sci.

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. Optical sensors have potential for determining nitrogen fertilizer topdressing requirements of canola in Saskatchewan. Can. J. Plant. Sci. 89: 411Á425. An important challenge in N management is matching fertilizer inputs to crop requirements for specific environmental conditions. Field experiments were completed over 3 yr at two locations in Saskatchewan to evaluate the feasibility of using optical sensors and high-N reference plots along with topdressed liquid urea ammoniumnitrate (UAN) to arrive at more optimal N rates for canola (Brassica napus L.). Treatments included N management strategies where the timing and methods of application were varied along with the total quantities of N applied. Sensorbased N management was compared with the predominant practice of banding predetermined amounts of N at seeding. On average, sensor-based N management resulted in a 34 kg N ha(1 reduction in fertilizer use with no effect on seed yields except at Indian Head in 2006 where dry conditions resulted in yield reductions of 370 to 454 kg ha(1 compared with applying canola's entire N requirements at seeding. Sensor-based N management or split-N applications never increased yields relative to applying all N at seeding. Adopting this technology in western Canada will more likely result in reduced N inputs without reducing yield than increased seed yield. While sensor-based N management did not reduce post-harvest residual soil NO 3 -N levels, agronomic N use efficiency (ANUE) was increased 33% of the time and was never lessened. When significant, the increase in ANUE ranged from 4.8 to 7.8 kg seed kg N applied 2009. Les capteurs optiques permettraient d'e´tablir la quantite´d'engrais azote´s a`appliquer en couverture pour la culture du canola en Saskatchewan. Can. J. Plant. Sci. 89: 411Á425. Une grande difficulte´dans la gestion des engrais azote´s (N) consiste a`faire concorder les applications aux exigences de la culture selon les conditions ambiantes. Les auteurs ont proce´de´a`une expe´rience de trois ans sur le terrain, a`deux endroits de la Saskatchewan, afin d'e´tablir si on pourrait se servir de capteurs optiques et de parcelles de re´fe´rence a`forte concentration de N pour e´pandre en couverture un engrais liquide a`base d'ure´e et de nitrate d'ammonium et parvenir a`un taux d'application mieux adapte´au canola (Brassica napus L.). Les traitements incluaient des strate´gies de gestion de l'azote en vertu desquelles le moment et la me´thode d'application variaient avec la quantite´totale de N applique´e. On a compare´la gestion des engrais N avec des capteurs a`la pratique la plus courante, qui consiste a`e´pandre une quantite´de´termine´e d'engrais en bande lors des semis. En moyenne, la gestion des engrais N s'appuyant sur des capteurs a diminue´la quantite´d'engrais employe´e de 34 kg de N par hectare, comparativement al 'application de la quantite´totale d'engrais recommande´e pour le canola aux semis. Le rendement grainier n'en a pas souffert, sauf a`Indian Head, en 2006, ou`la se´cheresse l'a re´duit de 370 a...

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“…The cited earlier studies of spring-planted canola tested open-pollinated varieties, which have been shown to have considerably lower yield potential and fertilizer requirements than currently grown hybrids (Karamanos et al, 2005;Brandt et al, 2007;Smith et al, 2010). The cited earlier studies of spring-planted canola tested open-pollinated varieties, which have been shown to have considerably lower yield potential and fertilizer requirements than currently grown hybrids (Karamanos et al, 2005;Brandt et al, 2007;Smith et al, 2010).…”

Section: Yield Response To Early Defoliation In Spring-planted Canolamentioning

confidence: 99%

Yield Response to Early Defoliation in Spring‐Planted Canola

Syrovy

Shirtliffe

Zarnstorff³

2016

Crop Science

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Canola (Brassica napus L.) is a high‐value summer annual crop grown in the northern Great Plains of Canada and the United States. During the early stages of its life, the crop may lose leaf area as a result of spring hail storms, frost, herbicides, animal grazing, and insects. However, little information is available on the effect of defoliation during vegetative growth on yield for spring‐planted canola. To address this gap, a five site‐year study was conducted in central Saskatchewan, Canada, to test canola recovery from partial (50%) or full (100%) defoliation at five stages before flowering (2‐, 4‐, 6‐, 8‐, and 10‐leaf stages). Partially defoliated canola plots yielded, on average, 92% of untreated control plots, while fully defoliated canola yielded 75% of controls. The yield response to defoliation timings varied; in one site‐year yield loss was minimized with earlier timings, while in the remaining site‐years, seed yield response was inconsistent or unrelated to timing. Our study shows that partial or full defoliation of summer‐cropped canola at any point during vegetative growth is likely to cause a yield loss. However the crop's substantial compensation for loss of foliage means that reseeding is rarely profitable.

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Seeding rate, fertilizer level and disease management effects on hybrid versus open pollinated canola (Brassica napus L.)

Cited by 60 publications

References 16 publications

Growth and yield attributes of canola varieties under different seed rates

Growth and yield attributes of canola varieties under different seed rates

Optical sensors have potential for determining nitrogen fertilizer topdressing requirements of canola in Saskatchewan

Yield Response to Early Defoliation in Spring‐Planted Canola

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