RESPONSE OF GUAVA TREES TO SOME IRRIGATION AND FERTILIZATION TREATMENTS

Abstract

The present investigation was carried out during 1997 and 1998 growing seasons on twenty-five years old seedy guava trees grown in El-Maamoura Experimental Station of the Agricultural Research Center, Alexandria Govemorate, in order to study: The effect of soil application of nitrogen and potassium, the irrigation treatments and its combination on vegetative growth, fruit quality, fruit and leaf mineral content. The results could be summariz ed as follows: I- Vegetative growth: There were significant increases in shoot number per tree as a result of fertilization treatments in both seasons. The highest shoot length was obtained with treatment F7 with high rates of nitrogen and potassium, the differences, however were not significant when compared with the control. The high level of irrigation after fertilization gave the highest number of shoots per tree in both seasons. The high level of irrigation after fertilization gave higher shoot length than that obtained by high level before fertilization in both seasons. The highest number of shoots per tree was in trees receiving low level of irrigation after fertilization combined with F6 and F7 in the first and second seasons, respectively. The highest shoot length (cm) was in F7 and F2 with high level of irrigation after fertilization in the first and the second season, respectively.