الفهرس 
Effect of whey and putrescine spray on productivity and fruit quality of mango trees CV. Ewais
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Abstract
This experiment was carried out during 2014 and 2015 seasons to study the effect of foliar application of whey and putrescine on improving vegetative growth, nutritional status, fruiting and fruit quality of Ewais mango cultivar. Trees were sprayed with whey at 10%, 20%, and 30%, Putrescine at 5 ppm, 15 ppm, 30 ppm moreover control (water sprayed). Trees were sprayed four times, the first time at the beginning of flowering (first week of March),the second was at full bloom stage (last week of March) the third was at three weeks after setting (third week of April) and the fourth was (at third week of May). Results showed that foliar application of whey and putrescine enhanced initial and final fruit set. Putrescine at 5ppm and whey at 30% recorded the highest initial fruit set in the first and second seasons respectively. Putrescine at 5ppm recorded the highest value of final fruit set followed by putrescine at 15ppm and whey at 20% in both seasons. The lowest fruit DROP and the highest fruit retention were obtained from putrescine at 5ppm in both seasons. The highest number of fruits per tree was achieved with whey treatment at 20% followed by putrescine at 5ppm in both seasons. Trees treated with whey at 20% or putrescine at 5ppm produced the highest yield (as number of fruits per tree or Kg/tree). Whey treatments were more effective in increasing fruit weight than putrescine where the highest values were detected with whey at 20%. The highest value of fruit TSS was recorded by putrescine at 5ppm in both seasons. The lowest fruit acidity was recorded with control; meanwhile, the highest fruit acidity was recorded with putrescine at 30ppm and whey at 20% in the first and second seasons respectively. The highest significant values of TSS/ Acid ratio were detected with putrescine at 5 ppm in the first season and whey at 10% in the second one. Putrescine at 5 ppm and whey at 10% treatments were more effective in improving fruit quality, enhancing vegetative growth and nutritional status of Ewais mango trees