Abstracts from the proceedings of the virtual 2021 American Society of Sugar Beet Technologists biennial conference - Agriculture papers Part Ⅱ + Factory papers

摘要

Nitrogen (N) management is important in sugar beet production. This paper presents data to support a shift from a yield-based N management approach to a static range N management approach in the Northwest U.S. Production data and research show that yield-based N management can result in over application of N. Past research has been critical to improving and understanding sugar beet N nutrition. However continued research is needed so cumulative data can be evaluated to improve management practices. From 2005 to 2019, studies from 20 locations (20 site-years) were conducted by agronomists from The Amalgamated Sugar Company (TASCO) and scientists at the USDA-ARS Northwest Irrigation and Soils Research Laboratory to evaluate the effect of N supply (fertilizer N + spring soil residual N (Nitrate N + Ammonium N) on sugar beet production in the Pacific Northwest. Eleven of the site-years had a significant relationship between N supply and ERS yield. Nine of the site-years did not have a significant relationship between N supply and ERS yield. The amount of N supply needed to maximize yields in the 11 responsive sites research studies was within N supply range of 129 to 258 kg/ha (115 to 230 lbs N/acre). Using the past yield-based N management approach (3.5 kg N/metric ton beet [7 lbs N/ton beet]), recommended N supplies would have ranged from 213 to 325 kg/ha (190 to 290 lbs N/acre) from 2005 to 2019. Data shows that needed N supplies to maximize yields have not increased as yields have increased over time. Variation in the needed N supplies are likely due to spatial and temporal variability, and producer knowledge of the fields will help them dial in the needed N supply, preventing over supply of N.