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This profile was last updated on 5/17/08  and contains information from public web pages.

Employment History

  • Research Scientist
  • Researcher
  • Research Scientist
    AAFC Swift Current
  • Alternative Crops Agronomist
    AAFC Swift Current
  • Research Scientist At the Research Station
  • Researcher
15 Total References
Web References
Yantai Gan, a researcher at ..., 17 May 2008 [cached]
Yantai Gan, a researcher at Agriculture and Agri-Food Canada at Swift Current, Saskatchewan, says that while seed size is a genetically controlled trait, the seed size distribution in the harvested seed lot is strongly influenced by several factors, including the growing season environment.To help guide chickpea growers on the best agronomic practices for growing bigger seed, he conducted a field experiment from 2004 to 2006 with plots located at Swift Current and Shaunavon, Saskatchewan.
"Yes, we know that seed size is partially determined by the variety, but for a given variety, we wanted to find out what the influence of different factors were on seed size," explains Gan.
However, Gan explains that this difference was mainly due to 2004 when the two stubble types were in adjacent fields.
"The year of 2004 was wet with growing season precipitation about 40 percent greater than normal and in that year we had a difference in seed size between barley and wheat stubble.The two stubble types were in separate, adjacent fields, though, but they had the same level of residual soil N and water.However, during the last two years (normal to dry years), the two stubble types were in the same field and we didn't see any difference.So, there is a need to determine whether the differences observed in 2004 were due to wet conditions or due to other factors.In general, I wouldn't be too concerned about wheat or barley stubble selection," explains Gan.
Even, shallow planting depth helps Saskatchewan farmers beat the fall frost - Reduced Tillage LINKAGES, 1 Feb 2007 [cached]
Crops seeded unevenly "are the worst," says Dr. Yantai Gan, a research scientist at the Agriculture Canada Research Station in Swift Current. Shallow seeded plants emerge several days faster and compete with the slower emerging, deep seeded plants for water, light and soil nutrients, reducing their yield by up to 50% or more. There can be 10 days between the first and last plants to emerge, which can be crucial in a frost year, he adds. Dr. Gan says frost or no frost, crops seeded shallow and uniform have a definite edge. They emerge more quickly and evenly, mature faster, and have higher yields. He led a three-year study that showed canola, mustard, and flax planted uniformly at ¾ of an inch in early May emerged 3 to 5 days faster than seeds planted at 2 inches and had yields up to 25 % higher.
Dr. Gan says it depends largely on the land, how evenly farmers distribute residue from last year's crop if they direct seed, and the depth control they achieve with their equipment.
It's not to save money on ..., 17 May 2008 [cached]
It's not to save money on inputs or provide the highest yield, but it can allow a grower to harvest a crop sooner to avoid a frost," explains Yantai Gan, a research scientist at AAFC Swift Current, Saskatchewan.
"The maturity problem with chickpeas is that they have a strong indeterminate growth habit.When conditions are favourable, the plants continue their vegetative growth, which delays maturity.But with nitrogen fertilizer, the plants develop a more vigorous vegetative growth early in the season, which depletes applied nutrients and soil water, promoting earlier maturity."
Gan conducted three years of field experiments at Swift Current and Shaunavon, Saskatchewan from 2004 to 2006, with funding from the Saskatchewan Pulse Growers Association, the Saskatchewan Agricultural Development Fund, and the AAFC Federal MII.Gan has summarized the results of the first two years, while the final year of data is being analyzed.However, Gan says the trends in the first two years are evident in the 2006 data as well.
Source: Gan, AAFC Swift Current.
"As a risk management tool, using nitrogen fertilizer looks very promising," says Gan.
In 2006, Gan says differences were relatively small, because precipitation in July and August was very low, and all crops matured quickly.
Gan says that while the inoculant treatments often produced higher yields, they had to be balanced off with the risk of delayed maturity.
To use nitrogen fertilizer as a maturity risk strategy, Gan says producers should carefully select the field.He explains that a field that has a low residual soil N is a good choice for chickpeas.The field that had a crop with very high yield the previous year, such as a durum, canola or barley crop, would be good for chickpeas to follow this year because this land has low soil residual nitrogen.Conversely, summerfallow fields usually have very high residual nitrogen, along with the fields that had poor crops the previous year due to poor growing conditions, or the field that shows high fertility levels in a soil test are not good candidates for chickpeas.Gan says that fields with 50 to 60 pounds per acre of available N would not be suitable for this strategy.
Table 1.
Source: Gan, AAFC Swift Current, from 2004 and 2005 data.
"On fields with lower residual fertility, the nitrogen fertilizer applied at seeding is picked up quickly during the early seedling stages, resulting in vigorous vegetative growth which will be the foundation for pod production later on.Later in the season, the soil will run out of nitrogen-supplying power, and the chickpeas vegetative growth will shut down and seed set will start," explains Gan.But if there is high soil residual N, it will allow plants to continue to grow because the residual soil nitrogen will be released gradually from the soil, and it may last for the entire growing season."
Once the 2006 data is crunched, Gan will be summarizing the research and providing more specific recommendations.
Organic Agriculture Researchers on the Prairies, 1 Dec 2006 [cached]
Yantai Gan Alternative Crops Agronomist AAFC Swift Current PO BOX 1030 SWIFT CURRENT SK S9H 3X2 Land Resources and Environment Telephone: (306) 778-7246 Fax: (306) 778-3188
Prof and Dr.Gan, Research Scientist at ..., 1 Nov 2009 [cached]
Prof and Dr.Gan, Research Scientist at the SPARC (AAFC) Research Station, Swift ...
To review many abstracts, check the boxes to the left of the titles you want, ... Gan, Thomas D. Warkentin, Rajamohan Chandirasekaran, Bruce D. Gossen, Thomas ...
Pulse Crop Research Group Web Site in Department of Plant Sciences and Crop ... Rajamohan Chandirasekaran, Yantai Gan, Tom Warkentin and Sabine Banniza ...
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