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۱Water Deficit and Foliar Fertilization and their Effect on Growth and Photosynthetic Pigments of Jatropha Plants
نویسنده(ها): ، ،
اطلاعات انتشار: World Applied Sciences Journal، بيست و هفتم،شماره۴، ۲۰۱۳، سال
تعداد صفحات: ۸
In order to study the effect of K foliar fertilizer under different irrigation treatments, a pot experiment was conducted in the greenhouse of the National Research Centre, Dokki, Giza, Egypt. Results revealed that increasing the depletion of available soil moisture before irrigation caused decreases in plant height and area of green leaves. Stem, leaves, top and whole plant dry weight were not significantly affected by these irrigation treatments. Spraying with both concentrations of potassium citrate (KC) significantly an increased growth criterion i.e. plant height, number and area of green leaves, roots, stem and leaves fresh weight of jatropha plants. The highest increment as a result of spraying jatropha plants with KC was in roots as well as stem dry matter and the lowest was in leaves dry weight. The enhancing effect may be due to that KC act as fertilizer and as antioxidant. Potassium spraying was more effective under irrigation after depletion of60% (D2) of available soil moisture and followed by that irrigated after depletion of 40% (D3) available soil moisture and the treatment 80% depletion (D1) before irrigation came later. Chlorophyll and carotenoids concentrations were decreased with the drought treatments, while total chlorophyll concentration only decreased by D1 and slightly increased with D2 compared to that of the regularly irrigated treatment. Nevertheless, chl. b was quietly decreased with D1 and tended to increase to be more than the control. Furthermore, Chl. a: Chl. b ratio was lowered sharply with drought treatment and the reverse was true for Chl. a + Chl b: carotenoids ratio. Chl. b was decreased with both K treatments but the decrement was more with F2 (spraying of potassium citrate in the rate of 1.5 g\l) in comparable with D1 or that of plants sprayed by distilled water. On the other hand, the Chl. a + Chl. b ratio showed the opposite trend. Carotenoids was slightly increased with moisture stress treatment, however, the highest values of Chl.a was obtained with K1 treatment meanhile, Chl. a + Chl. b: carotenoids ratio was not affected by F1 (spraying of potassium citrate in the rate of 0.75 g\l) but was decreased with F2 (spraying of potassium citrate in the rate of 1.5 g\l) treatment.
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