. Cranberries; : the national cranberry magazine. Cranberries. greenhouse with supplemental incandescent lamps to provide a 16 hour day length. The longest shoots were over 70 cm. in length at the end of this period. NUTRIENT SOLUTIONS were developed to provide the following concentrations of nutrients in ppm: phosphorus 31, potassium 234, calcium 200, magnesium 50, boron , copper , manganese , zinc .05, molyb- denum .05, iron 4, ammonium nitrogen 21, and nitrate nitrogen 240, with sulfur varied among pots as the primary salts were interchanged to provide for deficiencies in the sele
. Cranberries; : the national cranberry magazine. Cranberries. greenhouse with supplemental incandescent lamps to provide a 16 hour day length. The longest shoots were over 70 cm. in length at the end of this period. NUTRIENT SOLUTIONS were developed to provide the following concentrations of nutrients in ppm: phosphorus 31, potassium 234, calcium 200, magnesium 50, boron , copper , manganese , zinc .05, molyb- denum .05, iron 4, ammonium nitrogen 21, and nitrate nitrogen 240, with sulfur varied among pots as the primary salts were interchanged to provide for deficiencies in the selected elements. The ammonium nitrogen at 21 ppm was added to all pots as ammonium nitrate at the beginning and on two occasions during the experimental period. The solution reaction (pH) was adjusted weekly and maintained in the range of pH to At the end of nine weeks, all new shoot growth was measured for linear extension and leaf samples were harvested for spectrophotometric analysis of mineral concentration. The elemental analyses were made by a commercial laboratory with flame spectrophotometric capabilities using standard procedures. The data are presented in Table 1. Restricted growth was found in pots without each of the following elements: potassium, calcium, sulfur, magnesium, zinc and iron. Normal growth extension was maintained for nine weeks without supplemental boron, manganese and copper. Deficient plants for each element contained the following levels of that element: potassium, percent; calcium, less than percent; magnesium, percent; boron, less than ppm; zinc, ppm; copper, ppm, and iron, 26 ppm. Tire plants in the absence of manganese had an Mn concentration of less than ppm without showing deficiency symptoms. The plants with iron deficiency maintained a concentration of 26 ppm, the same as that found in the no-magnesium grown plants that did not display iron deficiency. DESCRIPTIONS of each of the deficiencies induced in
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