IPI International Potash Institute
IPI International Potash Institute

Scientific abstracts

Title:
Leaf Nutrients Ranges and Berry Yield Optimization in Response to Soil-Applied Nitrogen, Phosphorus and Potassium in Wild Blueberry (Vaccinium angustifolium Ait.)
Authors:
Maqbool, R., D. Percival, Q. Zaman, T. Astatkie, S. Adl, and D. Buszard
Published in:
Eur.J.Hortic.Sci. 82(4)166-179 (2017), English

Abstract:

The study examined the main and interactive effects of soil-applied fertilizers (nitrogen, phosphorus, and potassium) and optimum fertilizer rate for the vegetative and crop phases leaf nutrients and berry yields of wild blueberry (Vaccinium angustifolium Ait.). Data were collected between 2004 and 2010 from previous and ongoing nutrition studies that were laid out in a central composite design (CCD). Experimental sites were located at Kemptown and Mount Thom, Nova Scotia, and Brantville, New Brunswick (Canada). Treatments consisted of five levels of soil-applied nitrogen (0, 12, 30, 48, and 60 kg N ha-1), phosphorus (0, 18, 45, 78, and 90 kg P ha-1), and potassium (0, 12, 30, 48, and 60 kg K ha-1). Leaf nitrogen (N) and phosphorus (P) concentrations significantly increased with the addition of soil-applied N and P fertilizers, respectively. Leaf potassium (K) content in vegetative year had a significant quadratic response (convex shape) to soil-applied N and P. Leaf calcium (Ca) and magnesium (Mg) concentration exhibited significant concave quadratic (depression) response to soil added N, P and K. Nitrogen fertilizer significantly increased berry yields while soil-applied P and K had quadratic effects on berry yield. For commercial fields with similar soil nutrient levels, physical, biochemical and biological characteristics they recommend soil fertilizer rates of 30 kg ha-1 N, 40 kg ha-1 P, and 30 kg ha-1 K applied at pre-emergence of shoots in the vegetative year of production to optimize foliar nutrient levels and berry yields. They suggest new optimal vegetative year leaf nutrient ranges N (1.80-2.03%), P (0.155-0.160%), K (0.53-0.55%), Ca (0.44-0.46%), Mg (0.115-0.13%), and B (24-26 ppm) for wild blueberry fields in Atlantic Canada.

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