Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 107, Issue -, Pages 446-452Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2017.05.027
Keywords
Switchgrass; Upland varieties; Lowland varieties; Long-term yields; Nitrogen rates; Marginal land
Categories
Funding
- SWITCHGRASS for ENERGY project [FAIR CT97 3701]
- OPTIMA [289642]
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Switchgrass (Panicum virgatum L.) is a perennial grass that has been selected as a candidate bioenergy crop for USA in the early 80s, while the research in Europe started a decade later. A long-term study on switchgrass had been carried out (1998-2015) on a marginal area in Greece comparing five varieties (having lowland or upland ecotype) at increasing nitrogen fertilization rates (0, 75 and 150 kg N ha(-1)). Due to the successful establishment of the plantation quite satisfactory yields were recorded even at the establishment year (8.9 Mg DM ha(-1)) and the ceiling yields were recorded in the 2nd year and came up to 20 Mg DM ha(-1). The under study lowland varieties (Alamo, Kanlow and Pangburn) were more productive compared to the upland varieties (Blackwell and CIR) with mean dry yields 12.37 and 11.39 Mg ha(-1), respectively and showed higher resistance to lodging. Among the five under study varieties, Alamo was the best performing giving an average yield of 12.7 Mg DM ha(-1), averaged over all treatments and years, while CIR was the least performing producing a corresponding average yield of 10.8 Mg DM ha(-1). From the fourth growing season and onwards significantly higher yields were recorded under increasing N fertilization up to 150 kg N ha(-1) with an average yield of 13.9 Mg DM ha(-1) (150 kg N/ha) over all varieties and years. The corresponding yields for the other two tested nitrogen rates (0 and 75 kg N/ha) were 10.31 and 11.69 Mg DM ha(-1), respectively.
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