Effect of NPK and humic substance applications on vegetative growth of Egazy olive seedlings.

摘要

This study was carried out on cultivated Egazy olive transplants grown at the greenhouse of National Research Center, Dokki, Giza, Egypt. The investigation aimed to study the effect of applying NPK, humic substance on vegetative growth of Egazy olive seedlings planted in plastic bags at nursery stage. After planting Egazy olive seedlings, the following treatments were applied: T1: NPK (Crystalon 20% N: 20% P: 20% K) at four rates (0, 25, 37.5 and 50 gplantyear), T2: humic substance (Potash actosol) at four rates (0, 2, 4 and 6 cm 3plantyear), also the interaction between NPK, humic substance treatment were studied. At the end of the season, percentage of plant height increment, leaves number per plant, shoot numbers per plant, stem diameter, leaves dry weight %, root numbers, root length were determined and recorded. The obtained results revealed that treatment (4 cm3 humic substance only) was the most effective one compared with the other treatments. Since this treatment gave the best results concerning percentage of plant height increment, lateral shoot number per plant, leaves number per plant, stem diameter, also it increased leaves dry weight % comparing with the control. On the other hand, the highest root number was recorded from Egazy olive seedlings not fertilized with NPK and/or humic substance. While, the highest root length value was obtained by using 2 cm3 humic substances without NPK.