This work aimed to improve growth, nutritional status, productivity and fruit quality of seedy guava trees through investigating their response to dormex; some nutrient elements (urea, K2SO4, ZnSO4 and Borax) and their possible combinations. The applied treatments were as follows:
1- Control “water spray”. 2- Dormex at 2%. 3- Urea at 1%.
4- Potassium sulphate at 2%. 5- Zinc sulphate at 0.5%.
6- Borax at 0.3%. 7- Urea at 1% + K2SO4 at 2% + ZnSO4 at 0.5% + Borax at 0.3% 8- Dormex at 2%+Urea at 1% + K2SO4 at 2% +ZnSO4 at 0.5% + Borax at 0.3% .
Nutrient elements were sprayed twice at full bloom and after fruit set (one month later), while dormex was carried out in mid January during both seasons of study. Since those foliar treatments were evaluated regarding their influence on some vegetative growth measurements; leaf photosynthesis pigments and nutritional status (leaf mineral composition) and some fruiting aspects of seedy guava trees (fruit set, yield and fruit quality).
From obtained results of the present study it could be recommended by sprays the guava trees with Dormex at 2% in January then sprays twice with combination from (urea at 1% + K2SO4 at 2% + ZnSO4 at 0.5% + Borax at 0.3%) at full bloom and after fruit set (one month later) to improve vegetative growth; nutritional status; yield and fruit quality of guava.