Abstract
Fertilizer recommendations for cranberry crops are guided by plant and soil tests. However, critical tissue concentration ranges used for diagnostic purposes are inherently biased by nutrient interactions and physiological age. Compositional data analysis using isometric log ratios (ilr) of nutrients as well as time detrending can avoid numerical biases. The objective was to derive unbiased nutrient signature standards for cranberry in Quebec and compare those standards to literature data. Field trials were conducted during 3 consecutive years with varying P treatments at six commercial sites in Quebec. Leaf tissues were analyzed for N, P, K, Ca, Mg, B, Cu, Zn, Mn and Fe. The analytical results were transformed into ilr nutrient balances of parts and groups of parts. High-yield reference ilr values were computed for cranberry yielding greater than 35 Mg ha-1. Many cranberry fields appeared to be over-supplied with K and either under-supplied with Mn or over-supplied with Fe as shown by their imbalanced [K | Ca, Mg] and [Mn | Fe] ratios. Nutrient concentration ranges from Maine and Wisconsin, USA, were combined into ilr values to generate ranges of balances. It was found that these nutrient ranges were much too broad for application in Quebec or outside the Quebec ranges for the [Ca | Mg] and the [Mn | Fe] balances, that were lower compared to those of high yielding cranberry crops in Quebec.
Highlights
Cranberry (Vaccinium macrocarpon Ait.) (‘Atoca’ or ‘Ataca’ in the Iroquoian languages, a designation commonly used in the province of Quebec, Canada) is the American name for an Ericaceous plant domesticated in North America since the beginning of the 19th century, and since 1939 in Quebec, Canada
Experimental setup Tissue analytical data and fruit yields were obtained from six P trials on cranberry
Cranberry yield is limited by the degree of pollination that drives floral induction and fruit set as well as competition between uprights for available C (ROPER, 2006)
Summary
Cranberry (Vaccinium macrocarpon Ait.) (‘Atoca’ or ‘Ataca’ in the Iroquoian languages, a designation commonly used in the province of Quebec, Canada) is the American name for an Ericaceous plant domesticated in North America since the beginning of the 19th century, and since 1939 in Quebec, Canada. Cranberry is selected since 1835 for commercially viable traits such as fruit yield and quality (ROPER; VORSA, 1997). Ripening berries change from white and firm to red, fleshy and juicy. The berry has a high anti-oxidant content and is consumed as dried fruit, sauce or juice. The current area of cultivated cranberry in Quebec is 3,250 ha. Plantations are established in low-lying landscape positions to facilitate water management (PARENT & MARCHAND, 2006)
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