scholarly journals Quantifying field weeds emergence pattern of weeds in rapeseed (Brassica napus L.) under weather conditions of Khuzestan, Iran

2020 ◽  
Vol 22 (2) ◽  
pp. 198-211
Author(s):  
ahmad zare ◽  
elham elahifard ◽  
zahra Taklifi Adnani ◽  
ahmad rostaei ◽  
◽  
...  
Keyword(s):  
Brassica Napus ◽  
Weather Conditions ◽  
Brassica Napus L ◽  
Emergence Pattern

Statistical modeling of insect behavioral response to changes in weather conditions in Brassica napus L.

2017 ◽  
Vol 11 (4) ◽  
pp. 613-621 ◽  
Author(s):  
Emerson Dechechi Chambó ◽  
Newton Tavares Escocard de Oliveira ◽  
Regina Conceição Garcia ◽  
Maria Claudia Colla Ruvolo-Takasusuki ◽  
Vagner Alencar Arnaut de Toledo
Keyword(s):  
Brassica Napus ◽  
Statistical Modeling ◽  
Behavioral Response ◽  
Weather Conditions ◽  
Brassica Napus L

scholarly journals Evaluation of the Effectiveness of Pod Sealants in Increasing Pod Shattering Resistance in Oilseed Rape (Brassica napus L.)

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2256 ◽  
Author(s):  
Dainius Steponavičius ◽  
Aurelija Kemzūraitė ◽  
Laimis Bauša ◽  
Ernestas Zaleckas
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Seed Yield ◽  
Weather Conditions ◽  
Control Treatment ◽  
Yield Losses ◽  
Brassica Napus L ◽  
Pod Shattering ◽  
Seed Loss ◽  
Net Profit

Shattering of pods of oilseed rape (Brassica napus L.) is a major cause of seed yield losses prior to and during harvesting. In order to reduce shattering, researchers have been engaged in the development of special preparations that are known as pod sealants (PS). Despite the fact that there are already developed and commercialized PSs that have only been effective on seed yield preservation under certain environmental conditions, there is still a need to create a more versatile and efficient PS. Currently, the most promising method of controlling pod shattering in oilseed rape is the application of our developed novel acrylic- and trisiloxane-based pod sealant (PS4). The effectiveness of PS4 and three commercial pod sealants (PS1, PS2, and PS3) was assessed in this comparative study. By spraying an oilseed rape crop with PS4, natural seed loss can be reduced by 20–70%, depending on the prevailing weather conditions, and loss of seeds during harvest can be reduced by more than three-fold compared with that by the control treatment. Thus, the overall results demonstrated that by applying a novel pod sealant (PS4) to oilseed rape crops 2 weeks before harvest can increase the net profit margin by €30–€150 ha−1. The life cycle assessment showed that during 2014–2016 oilseed rape cultivation, the largest effect on global warming emission (kg CO2 eq) reduction was experimental sealant PS4, i.e., approximately 17% compared to the control.

scholarly journals SCREENING OF VARIETAL SAMPLES OF SPRING RAPESEED (Brassica napus L.) FOR RESISTANCE TO PHYTOPATHOGENS

2019 ◽  
pp. 50-55
Author(s):  
Игорь Пастухов ◽  
Igor Pastukhov ◽  
Владимир Карпачёв ◽  
Vladimir Karpachev ◽  
Елена Кобзева ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Powdery Mildew ◽  
Research Work ◽  
Weather Conditions ◽  
Scientific Research Institute ◽  
Brassica Napus L ◽  
Russian Scientific ◽  
Russian Scientific Research Institute ◽  
Resistance To Phytopathogens ◽  
Degree Of Damage

Diseases are one of the reasons for the decline in yield of rape. Breeders are to create resistant to diseases and pests varieties and hybrids of rape because this culture is widely used in Russia. Nowadays we know about 30 pathogens of cabbage cultures. Among the diseases of rape are alternaria, fusarium, sclerotinia, powdery mildew, fomoz, perinospora, bacteriosis, etc., which cause a shortage of yield from 15 to 70%. Varieties of rape for resistance to alternaria, perinospora, and fusarium were appreciated at the All-Russian Scientific Research Institute of Rapeseed from 2016 to 2018. The most samples of Brassica napus were affected by alternaria in mild and moderate degrees. The degree of damage by perinospora depended on weather conditions and ranged from a very weak level to an average one. The degree of damage by fusarium was from single to weak and it was connected with many years of the research work. Thus, we could isolate samples, weakly susceptible to alternaria; samples, weakly susceptible to perinospora; samples, weakly affected by fusarium.

Losses of canola seeds from feeding by Lygus species [Heteroptera: Miridae] in Manitoba

1995 ◽  
Vol 75 (3) ◽  
pp. 731-736 ◽  
Author(s):  
W. J. Turnock ◽  
G. H. Gerber ◽  
B. H. Timlick ◽  
R. J. Lamb
Keyword(s):  
Brassica Napus ◽  
Key Words ◽  
Low Frequency ◽  
Weather Conditions ◽  
Total Precipitation ◽  
Weather Factors ◽  
Brassica Napus L ◽  
Seed Damage ◽  
The Mean ◽  
Effects Of Temperature

Pods of canola plants (Brassica napus L., mostly cv. Westar) were sampled annually from 11–40 canola fields in Manitoba in 1985–1991. The effects of temperature, precipitation, and lygus bug density (in 1989 and 1990) on seed classes (normal, aborted, and collapsed) were determined. In 1991, all pods from 10 racemes sampled from each of 11 canola fields in Manitoba were examined, and the collapsed seeds were classified as injured by lygus bugs or not. The proportion of aborted seeds was not related to lygus bug densities or to weather conditions. The proportion of collapsed seeds varied from 2 to 53% among fields and was related to the number of lygus bugs in the field at the time the pods were collected. Collapsed seeds increased by 1.5% for each lygus bug per sweep. In 2 yr, the proportion of collapsed seeds increased with the mean monthly temperature and decreased with the total precipitation in July, but these weather factors accounted for little of the variation in the proportion of collapsed seed in most years. Collapsed seeds occurred at low frequency in many pods at all canopy levels, but they were most common in small pods in the upper part of the canopy. The proportion of seeds injured by lygus bugs was estimated to be 3–5%, on average, and in some fields, 20%. In addition, lygus bug feeding on other parts of the host plant may induce seed collapse. Key words: Insecta, Lygus, Brassica napus, seed damage, canola

Heterotic response and combining ability analysis in F1 diallel populations of Brassica napus L.

2019 ◽  
Vol 51 (6) ◽  
Author(s):  
Samrin Gul ◽  
Razi Uddin ◽  
Naqib Ullah Khan ◽  
Shahid Ullah Khan ◽  
Sardar Ali ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Combining Ability ◽  
Brassica Napus L ◽  
Combining Ability Analysis

Жирнокислотный состав масла семян селекционных линий ярового рапса (Brassica napus L.) в условиях Ленинградской области

2018 ◽  
pp. 12-17
Author(s):  
Т. В. Шеленга ◽  
А. В. Конарев ◽  
Л. П. Бекиш ◽  
Л. Ю. Новикова ◽  
И. Н. Перчук ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Brassica Napus L

Отмечена роль Н. И. Вавилова в организации исследований исходного и селекционного материала по биохимическим признакам, определяющим пищевые, кормовые и технологические качества сельскохозяйственной продукции. Выделен перспективный материал для создания сортов рапса с улучшенными пищевыми, кормовыми и технологическими характеристиками; выявлен характер зависимости признаков качества масла от погодных условий (температура, количество осадков и др.). Изучены 50 высокоэруковых (ВЭ) и 40 низкоэруковых (НЭ) линий ярового рапса (Brassica napus L.), выращенных в условиях Ленинградской области в 2012 – 2015 гг. Содержание масла и влажность в семенах определяли методом инфракрасной спектрометрии. Жирнокислотный состав (ЖКС) масла изучали с помощью газожидкостной хроматографии с масс-спектрометрией. Установлено содержание доминирующих жирных кислот для ВЭ и НЭ образцов, а также характер влияния погодных условий на ЖКС масла, в том числе на состав его отдельных фракций. Для ВЭ образцов установлена достоверная отрицательная корреляция (r = –0,96) между содержанием эруковой кислоты и температурой воздуха и достоверная положительная (r = 0,96) с количеством осадков в первую декаду июля. Для НЭ образцов установлена достоверная отрицательная зависимость между содержанием эруковой кислоты и средней температурой воздуха в мае. Выделенные образцы с высоким содержанием олеиновой (61,4 %) и низким линолевой (7,4 %) кислот можно рекомендовать для получения безэруковых сортов рапса, масло которых пригодно для длительного хранения. Контрастные по содержанию эруковой кислоты образцы будут использованы для создания сортов ярового рапса пищевого и кормового назначения, а также для производства биодизеля.

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