Sign up for email alerts of new Fluid Journal issues!
Fluid Journal : Fluid Journal 2005-2007
8 Fluid Journal SPRING 2007 DRS. RAMONA MOHR AND DALE TOMASIEWICZ Manitoba's processing potato industry has undergone rapid expansion in recent years, contributing to significant increases in potato production in this province. In Manitoba in 2001- 02, an estimated 12.8 million cwt of processing potatoes valued at $97.3 million were marketed. Despite the growing importance of the processing potato industry in Manitoba, research directed at the development of economically and environmentally sustainable fertilizer management systems for irrigated potato production has been somewhat limited. As a result, much of the information currently available to Manitoba producers is based on research conducted in potato-producing areas outside of Manitoba. This information may not be directly applicable under local environmental conditions. In 2003, a multi-year field study was initiated in southern Manitoba to assess N management in irrigated potato production systems in order to identify N management practices that optimize potato yield and quality while minimizing the potential for N losses from the plant/soil system. The following is preliminary information from this ongoing research project. Field experiments were conducted from 2003 through 2006 in Manitoba's potato-growing region. Study Suggests No Consistent Yield Benefit To Split N Fertilization Tuber yield highest for the 4x split N treatments in one of four site-years in Manitoba. Sites with low-to-medium soil NO3 levels, which would have received a recommendation for N fertilization based on current criteria, were selected in all years of the study. Experiments were conducted on a loamy sand near Carberry in 2003, Winkler in 2004, Douglas in 2006, and on a clay loam near Carberry in 2005. Russet Burbank potatoes were grown under irrigation in all years. Growing season conditions included good growing conditions in 2003, cool and wet conditions throughout the 2004 growing season, unusually high levels of precipitation in the early part of the 2005 growing season, and generally good growing conditions but below normal rainfall in 2006. Effect significant Effects of N management on yield varied among years. In 2003, total tuber yield increased linearly with increasing N rate across the range of N rates applied, but was not affected by the timing of N application. In contrast, in 2004, N rate had no effect on total tuber yield, but preplant application of N resulted in a higher total yield than split application. In 2005, a comparison of all treatments revealed a significant effect of treatment on total tuber yield. Overall, N application increased total tuber yield compared to the control treatment, but where N had been applied, there was no significant difference among rates.
Fluid Journal 2002-2004
Fluid Journal 2008-2009