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ARS Home » Northeast Area » Orono, Maine » New England Plant, Soil and Water Research Laboratory » Research » Publications at this Location » Publication #236308

Title: Soil phosphorus status in potato fields

item He, Zhongqi
item Honeycutt, Charles

Submitted to: Plant Nutrition Colloquium Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 6/17/2009
Publication Date: 8/26/2009
Citation: He, Z., Honeycutt, C.W., Zhang, H. 2009. Soil phosphorus status in potato fields. Plant Nutrition Colloquium Proceedings. On-line publication.

Interpretive Summary:

Technical Abstract: Potato crops generally require high amounts of phosphorus (P) fertilizer to reach economically acceptable yields. However, high inputs of P not only increase production cost, but also may increase the environmental risk of P runoff. We evaluated soil test P and sequentially-extracted P in soil samples from 10 potato fields which had three-year crop rotations with or without irrigation. Whereas soil test (Olsen) P was not significantly influenced by crop rotation and irrigation, P levels in sequentially-extracted fractions were impacted by management. The impact of crop rotation was mainly expressed on water extractable P. Irrigation had greater influence on stable P extracted in NaOH and HCl fractions. Higher levels of NaOH extractable inorganic P were observed in soil from irrigated fields, while higher levels of HCl extractable P were observed in soils under rainfed management. Our data indicate that crop management practice may eventually affect P availability and runoff potential in these potato soils over the long term. However, more field data from longer experimental periods are needed to confirm this hypothesis.