Ibrahim Al abdullah*(1), Muhammad Ayman daire(2), Mohamad kardoush(2)and Mahasen Tawaklna(3)
(1).pistachio office, ministry of Ministry of Agriculture and Agrarian, Hama, Syria.
(2). Department of horticulture, faculty of agriculture engineering, Aleppo University, ministry of high education, Aleppo, Syria.
(3). Administration of Horticulture Research, GCSAR, Damascus, Syria.
(*Corresponding author: Eng. Ibrahim Al abdullah. E-Mail: ima198720@gmail.com).
Received: 20/05/2021 Accepted: 29/07/2021
Abstract
The research aims to study the effect of potassium element in maintaining water balance under different levels of irrigation. it was carried out in Pistachio Office in Hama city on two-years-old pistachio plants grown in polyethylene bags. three irrigation and potassium treatments(0,75,150 mg/kg) were applied during. 2019 and 2020. The results showed a significant effect of water stress due to an increase period interval between irrigation, as most of the growth indicators (planting length – planting diameter – leaf area, etc.) decreased and reached its lowest value when irrigation with 14-day interval between irrigation. As for the potassium treatments it was reduced significantly and avoided the harmful effects of water stress and improved the water balance of seedlings. A significant increase was observed in the average length of the main axis of seedlings that treated with potassium sulfate (61 cm) compared with control plants (55.5) under water stress conditions, in addition to it was observed an increase in concentration of chlorophyll (38 mg / g ww) compared to control plants (36.19 mg / g ww), while the level of proline in the treated plants decreased significantly (46 mg / g ww) compared with untreated control plants (50 mg / g ww), and these results illustrate the important role of potassium ions in regulating water relations within the plant. And increase the plant’s ability to withstand the negative effects of water stress.
Keywords: seedlings, pistachio (P.vera), Water balance, Potassium Fertilization.
Full paper in Arabic: pdf