Sugarbeet response to broadcast and starter phosphorus applications in the Red River Valley of Minnesota

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Abstract

Field trials were conducted over eight site-years in the Red River Valley of Minnesota to test sugarbeet (Beta vulgaris L.) response to broadcast and starter P fertilizer. Experimental sites were selected based on low soil test P (≤7 mg P kg-1 Olsen P) and soil textures ranging from sandy loam to silty clay. Incremental P fertilizer rates from 0 up to 102 kg P2O5 ha-1 were broadcast and incorporated before planting sugarbeet with or without 14 kg P2O5 ha-1 liquid starter (14-L) applied directly to the seed. Eighteen and 22 kg P2O5 ha-1 as liquid starter (18-L and 22-L) and two rates of dry starter (14-D and 18-D) with 0 broadcast P were also applied directly to the sugarbeet seed at planting. High rates of starter tended to reduce sugarbeet seedling emergence up to 22%, but the effects of 14-L were minimal. There were no significant effects of the treatments on sugarbeet root quality, which ranged from 132 to 180 kg recoverable sucrose Mg-1 over the eight site-years. Root yield and recoverable sucrose ha-1 obtained with 14-L starter alone matched or exceeded that obtained with any other treatment. Over eight site-years, 14-L starter alone produced 45 to 65 Mg ha-1 root yield and 6 to 11 Mg ha-1 recoverable sucrose, which was not increased with additional P as either broadcast or starter fertilizer. The enhanced productivity with 14-L starter was evident soon after seedling emergence and was measurable 40 d after planting.

Original languageEnglish (US)
Pages (from-to)1369-1378
Number of pages10
JournalAgronomy Journal
Volume102
Issue number5
DOIs
StatePublished - Dec 1 2010

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