SEASONAL CHANGES IN SOME PHYSIOLOGICAL AND CHEMICAL CONTENT IN LEAFLETS OF DATE PALM Phoenix dactilyfera L . IN THE WESTERN DESERT, IRAQ

Abstract

Study was conducted in the western desert (south east of Al-Ramadi city) to shed light on drought tolerance,twelve of a number of already establishment field of Phoenix dactilyfera L. ( Zahde) trees which are used in thisstudy. Through out the best 8 years half of the trees was being irrigated regularly while the other half irrigationwas stopped two years period to the start of the experiment and contained to the end of it. Measurements on theleaf water potential and water loss were taken during the day hours (from dawn to sunset) for several days.Seasonal diurnal changes in total carbohydrates and other phenotypic characteristics, N and K percentage wererecorded. Dunces Multiple Range was used to separate the means at 0.5% probabilities. Changes in waterpotential values, water loss, total carbohydrates, N and K percentage depended largely on irrigation vs. nonirrigationand seasons, beside the nutrient elements were in low level in summer specially in leaflets of nonirrigationdate palms