Effect of moisture, nitrogen rates, and soil acidity on seed yield and chemical composition of winter oilseed rape cultivars

1993 ◽  
Vol 16 (1) ◽  
pp. 85-96 ◽  
Author(s):  
Z. Barszczak ◽  
T. Barszczak ◽  
C. D. Foy
Keyword(s):  
Chemical Composition ◽  
Oilseed Rape ◽  
Seed Yield ◽  
Soil Acidity ◽  
Winter Oilseed Rape ◽  
Effect Of Moisture ◽  
Nitrogen Rates

scholarly journals Risk Potential of Clubroot Disease on Winter Oilseed Rape

Plant Disease ◽  
2015 ◽  
Vol 99 (5) ◽  
pp. 667-675 ◽  
Author(s):  
Becke Strehlow ◽  
Friederike de Mol ◽  
Christine Struck
Keyword(s):  
Oilseed Rape ◽  
Seed Yield ◽  
Inoculum Density ◽  
Greenhouse Experiment ◽  
Resistant Cultivar ◽  
Yield Losses ◽  
Winter Oilseed Rape ◽  
Clubroot Disease ◽  
The Impact ◽  
Risk Potential

Clubroot disease caused by Plasmodiophora brassicae is an important disease of cruciferous plants. Although the pathogen is widespread and has been reported to cause high yield losses, the impact on winter oilseed rape (OSR) has not been experimentally verified. To quantify the risk potential of P. brassicae, we conducted two closely linked experiments. A semicontrolled experiment used artificial soil infestation at inoculum densities between 106 and 108 spores liter−1 of soil to detect the impact on seed yield and yield components of a susceptible and resistant OSR cultivar. A greenhouse experiment was implemented using the soil of the semicontrolled experiment after cropping the two cultivars to quantify the influence of cultivar resistance on soil inoculum. According to cumulative link mixed models, disease rating was positively correlated with the amount of inoculum. Linear regression analyses revealed a negative correlation between seed yield and inoculum density. Yield losses of 60% already appeared at the lowest inoculum density. Plant losses and reduced seed per pod were accountable for yield losses. Although the resistant cultivar showed clubroot symptoms, seed yield was not affected by the pathogen. The greenhouse experiment revealed that clubroot severity in subsequent OSR was reduced after cropping the resistant cultivar. This study showed significant yield damage of P. brassicae already at low infestation levels.

scholarly journals Do Soil Warming and Changes in Precipitation Patterns Affect Seed Yield and Seed Quality of Field-Grown Winter Oilseed Rape?

Agronomy ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 520
Author(s):  
Ireen Drebenstedt ◽  
Leonie Hart ◽  
Christian Poll ◽  
Sven Marhan ◽  
Ellen Kandeler ◽  
...  
Keyword(s):  
Soil Temperature ◽  
Oilseed Rape ◽  
Seed Yield ◽  
Seed Quality ◽  
Precipitation Amount ◽  
Winter Oilseed Rape ◽  
Soil Warming ◽  
Precipitation Patterns ◽  
Crop Development

Increasing air and soil temperatures and changes in precipitation patterns as consequences of climate change will affect crop production in agricultural ecosystems. The combined effects of soil warming and altered precipitation on the productivity and product quality of oil crops are not yet well studied. Winter oilseed rape (OSR) (Brassica napus L., cv. Mercedes) was field-grown under elevated soil temperature (+2.5 °C), reduced precipitation amount (−25%), reduced precipitation frequency (−50%) both separately and in combination in order to investigate effects on crop development, seed yield, and seed quality. Soil warming accelerated crop development during early plant growth and during spring. At maturity, however, plants in all treatments were similar in quantitative (aboveground biomass, seed yield) and qualitative (protein and oil content, amino acids, fatty acids) parameters. We observed the long-term effects of the precipitation manipulation on leaf size, leaf senescence and biomass allocation. Seed yield was not affected by the altered climatic factors, perhaps due to adaptation of soil microorganisms to permanent soil warming and to relatively wet conditions during the seed-filling period. Overall, OSR performed well under moderate changes in soil temperature and precipitation patterns; thus, we observed stable seed yield without negative impacts on nutritive seed quality.

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