Effect of Irrigation Escaping at Different Times on Growth and some Water Relations of Sunflower at North Nile Delta | ||||
| Egyptian Journal of Soil Science | ||||
| Article 2, Volume 53, Issue 1, March 2013, Page 9-19 PDF (394.01 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejss.2013.137 | ||||
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| Abstract | ||||
| TWO field experiments were conducted at El-Karada water management station, Kafr El-Sheikh Governorate, Egypt, during two successive seasons of 2008 and 2009. The present work was carried out to evaluate the effect of irrigation escaping at different times through the growing season on plant growth attribute of sunflower grown at North Nile Delta, photosynthetic pigments, the amount of water saving and irrigation water productivity. Randomized complete block design with three replications was used. The irrigation treatments included five treatments conventional irrigation along the growing season every 15 days (T1), escaping irrigation at the age of 30 days from sowing = 3rd irrigation (T2), escaping irrigation at the age of 45 days from sowing = 4th irrigation (T3), escaping irrigation at the age of 60 days from sowing = 5th irrigation (T4) and escaping irrigation at the age of 75 days from sowing = 6th irrigation (T5). The results showed that T4 had the highest values of crop water efficiency (0.77 kg m-3) and irrigation water productivity (0.62 kg m-3) as an the overall average of the two seasons. From the viewpoint of irrigation water saving, T4 and T5 recorded the highest values of irrigation water saving, with nearly the same amount, 511 and 519 m3/fed as an average of the two seasons, respectively. Data also revealed that irrigation escaping dates had a significant effect on leaf area, crop growth rate, net assimilation rate and relative growth rate in both growing seasons. The highest values of the abovementioned characters were obtained under T3 followed by T4 in both growing seasons at the second period (75-90) days after sowing. Also, chlorophyll a and b and carotenoids concatenation were significantly affected by the irrigation escaping dates and the highest values were recorded under T4 and T5 at the age of 60 days after sowing in both seasons. It could be concluded that the 5th irrigation (T4) is the best water management for sunflower crop since it saved water by 18.2% relative to control treatment and had the highest values of crop water use efficiency and irrigation waterproductivity. | ||||
| Keywords | ||||
| water relations; Sunflower; Escaping irrigation; Growth attributes; Chlorophyll a and b; Carotenoids | ||||
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