Abstract
SUMMARY A commercial lowbush blueberry field with a Colton sandy soil characteristic of the blueberry barrens of Washington County, Maine was the site for this study. Diammonium phosphate (DAP, 18-46-0) was applied at 448 kg/ha on 17 May (preemergent), 31 May, 14 June, 28 June, or 12 July 2000 for comparison with an unfertilized control plot. Stem height was measured on 20 tagged stems in each control plot of blocks 1, 2, and 3 at the time of fertilizer application. Composite leaf tissue samples taken for nutrient analysis indicated that there was a positive linear and quadratic relationship between leaf N concentration and fertilizer application date. Leaf P concentration had a quadratic relationship with application date. Applying fertilizer on 14 June resulted in the greatest uptake of N and P as indicated by leaf nutrient concentrations. Soil samples taken at the time of leaf sampling indicated no effect of any fertilizer application on soil P concentration. Fertilizer application did not affect stem ...
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