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Soil Fertility & Plant Nutrition

Response to Phosphorus of Cranberry on High Phosphorus Testing Acid Sandy Soils

Dep. of Soils and Agri-Food Engineering, Laval Univ., Quebec, QC, Canada G1K 7P4

^* Corresponding author (leon-etienne.parent{at}sga.ulaval.ca)

The fertilized sand-grown cranberry (Vaccinium macrocarpon Aiton cv. Stevens) could be at risk for water contamination by P during seasonal flooding and drainage, especially in high-P soils. The P diagnosis is usually conducted from soil and tissue tests but should also include water-extractable P (P_W) as an environmental index. Although the Bray-1 P (P_Bray1) test is the current test for cranberry soils, the Mehlich-III (M-III) test is now commonly used in Quebec and the mid-Atlantic USA as an agri-environmental index with specified thresholds. Our objective was to relate the (P/[Al+Fe])_M-III molar ratio to P_W and P_Bray1 and to evaluate this ratio against yield and tissue P responses to added P in high-P sand-grown cranberry crops. Fertilizer trials were conducted during the 2001 to 2004 period at rates of 0, 13, 26, and 39 kg P ha^–1 yr^–1 on permanent plots at five locations in central Quebec. The slope of the relationship between the (P/[Al+Fe])_M-III molar ratio (range: 0.024–0.094) and P_Bray1 (60–235 mg P kg^–1) was 0.0004 (R² = 0.92). There were significant site and year effects but no significant effect of added P on berry yield. There were significant linear effects of added P on tissue P concentration in the range of 0.9 to 1.4 g P kg^–1 but no critical value could be defined. The simulated (P/[Al+Fe])_M-III environmental threshold (9.7 mg P_W kg^–1) was 0.113. The (P/[Al+Fe])_M-III molar ratio could be used interchangeably with P_Bray1 in Quebec sand-grown cranberry crops but the provisionary environmental threshold must be ascertained from drainage water monitoring.

Abbreviations: D_b, bulk density • DPS, degree of phosphate saturation = (P_ox/[_m(Al_ox + Fe_ox)]) • _m, maximum saturation factor for total P sorption • OX subscript, extracted using the acid oxalate method • P_Bray1, phosphorus extracted using the Bray-1 method • M-III subscript, extracted using the Mehlich-III method • PES, plasma emission spectroscopy • P_W, water-extractable phosphorus

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				J. Guerin, L.-E. Parent, and R. Abdelhafid Agri-environmental Thresholds using Mehlich III Soil Phosphorus Saturation Index for Vegetables in Histosols J. Environ. Qual., May 25, 2007; 36(4): 975 - 982. [Abstract] [Full Text] [PDF]