Document Type : Original Article
Horticultural Crops Technology Department, Agricultural and Biological Institute, National Research Centre, Dokki, Giza, Egypt
Pomology Department, Agricultural and Biological Institute, National Research Centre, Dokki, Giza, Egypt
Central Lab of Organic Agriculture CLOA, Agricultural Research Center ARC, Giza, Egypt.
This research was conducted on avocado trees (Persea americana, Mill.) “Hass” cv. during 2020/2021 seasons in a private orchard located at El-Nubaria region, El-Beheira Governorate, Egypt. It was an attempt to substitute chemical fertilizers (CF) such as N, P, K and Mg with organic fertilizers such as compost (COM) and natural fertilizer sources (NFS) followed by a study of its impact on vegetative growth, yield, fruit quality, and nutritional status. Organic fertilizer was used alone or in combination with CF to fulfill the requirements of each tree. It contains an identical amount of compost (20 kg/tree) in combination with four levels of NFS to cover 100%, 75%, 50% and 25% of the tree's requirements. Considering that, the natural fertilizer sources (NFS) were granulated organic N fertilizer and natural raw rocky materials for P, K and Mg. The previous treatments were compared with 100% mineral recommended doses of N, P, K and Mg (control). Results indicated that mineral fertilization significantly improved values of all tested properties compared with all treatments in both seasons of the study with no significant differences between it and 50% organic fertilizer (20kg COM+NFS) + 50% CF treatment in the 2nd season with regard to the following traits (shoot length, shoot number/branch, fruit weight and pulp weight).