Response of Sugar Maple to Seven Types of Fertilization in Southern Quebec: Growth and Nutrient Status
The deciduous forest of southern Quebec has shown signs of decline since the beginning of the 1980s (Bordeleau 1986). This forest is dominated by sugar maple (Acer saccharum Marsh.) in combination with other deciduous species characteristic of the Great Lakes-St. Lawrence Forest (Rowe 1972). Sugar maple is especially affected by the decline although other deciduous species have shown similar symptoms (Gagnon et al. 1985; Hendershot and Jones 1989). Affected trees show progressive dieback from the outside to the inside of the crown. Leaves are usually small and show visual symptoms that are characteristic of P, K or Mg deficiencies (Bernier and Brazeau 1988b, c). Nutrient deficiencies are site-specific and some regional trends have been observed with the forests in Portneuf County of the Lower Laurentians being low in Mg and the forests in several areas of the Eastern Townships being low in K and P (Bernier et al. 1989).
KeywordsSugar Phosphorus Magnesium Maize Europe
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