Impact of irrigation water management and silicon spraying on avoiding cold injury and improvement

الملخص EN

The present study was carried out during 2015 and 2016 seasons on Kitt mongo trees to evaluate the effect of three irrigation water management (4000 m3 of irrigation water were applied to the four physiological stages of mango tree growth as 15 & 20 & 40 & 25 % , 30 & 15 & 35& 20 % and 35 & 20 & 30& 15 % m3 / tree/ year, respectively) as well as four concentrations of potassium silicate on avoiding cold injury and improvement yield of kitt mango .

Irrigation Mango tree by the second program water management (30, 15, 35 , 20) recorded The highest values of vegetative growth in terms of number of shoot /tree and lower values of leaves percentage affected with cold injury, Also, an evident increase in the content leaves of N & K elements , C/N ratio and final fruit set % total yield by divided irrigation water at the four physiological stages of mango trees (30, 15, 35, 20) was recorded compared with the other two water managements.

No significant differences between the second and third irrigation water management programs (30%, 15%, 35%, 20% and 35%, 20%, 30%, 15%) on values of leaf area, P% and total carbohydrates as well as on TSS, acidity and Lascorbic acid content of fruits .

Spraying trees with potassium silicate in three times during the period from October to January at the rate of 1000 ppm give the highest values of quality characteristics at mango trees and their fruits.

While sprayed with potassium silicate at 2000 ppm achieve moderate values of the mentioned characteristics It could be recommended from the obtained data that irrigation water management at the four physiological stages (30, 15, 35, 20) of Kitt mango trees and spraying 1000 ppm potassium silicate in dormancy period is considered a good treatment to avoid cold damage on leaves and fruits as well as in giving the highest yield and quality of kitt fruit