تأثير الرش بتراكيز مختلفة من البوتاسيوم والبورون في بعض الصفات المورفولوجية والفيسيولوجية و الإنتاجية لنبات عباد الشمس

Abstract

The study was carried out in the Ras Al-Basit area of Latakia Governorate for the 2023 agricultural season in order to study the effect of foliar spraying with different concentrations of potassium (5000,2500,0 and 7500 mg/L) and boron (100,50,0 and 150 mg/L) on some morphological, physiological and productive characteristics of the local sunflower plant according to the design of complete random sectors and with three repetitions for each treatment.  The highest values were recorded for the number of leaves (leaf/plant), leaf area index (cm3), number of seeds per disc (seed/disc), and the highest plant yield (g/plant) was (70.98,1088.24,3.96,35.67) respectively when treated with 100 mg/L boron and 7500 mg/L potassium, an increase of 103% On the witness, this is due to the positive role of potassium in stimulating cells to divide and elongate, especially embryonic cells, and increasing the transfer of photosynthesis products from their places of manufacture to their places of need in the plant, and to the positive role of boron in improving the growth of meristematic tissues through its effect in the formation of the growth hormone cytokine and some other enzymes. This leads to improving growth and survival standards in the sunflower plant, and therefore foliar spraying can be suggested at the two mentioned concentrations to improve morphological and physiological characteristics Productivity of local sunflower plants.