University of Khartoum

Performance of Lucerne (Medicago sativa L.) under Drip and Sprinkler Irrigation. Khartoum State, Sudan.

Performance of Lucerne (Medicago sativa L.) under Drip and Sprinkler Irrigation. Khartoum State, Sudan.

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Title: Performance of Lucerne (Medicago sativa L.) under Drip and Sprinkler Irrigation. Khartoum State, Sudan.
Author: Abdel Latif Yousif Idris, Idris
Abstract: Abstract A field experiment was conducted during the period of February 2007 to April 2010 in the Demonstration Farm of the Faculty of Agriculture, University of Khartoum at Shambat to study the performance of lucerne (Medicago sativa L.) under drip and sprinkler irrigation. The treatments were two irrigation intervals of eight and twelve days (W1 and W2, respectively) and two irrigation systems (drip and sprinkler). The daily rate of water application was 8 mm. Therefore, the amount/irrigation was 64 and 96 mm for W1 and W2 respectively. The irrigation treatments were arranged in a randomized complete block design with four replications. The crop was cut at monthly intervals. The measured parameters were fresh and dry weights of the fodder, leaf/stem ratio and the actual water used by the crop (Etcrop) between two successive cuts. The calculated values were crop water use efficiency (WUE), field water use efficiency (FWUE), the crop factor (kc) and crop water stress index (CWSI). The results showed that the fresh and dry weights and leaf/stem ratio under W1 were greater than those under W2 for both irrigation systems, with superiority of these parameters under drip irrigation. Etcrop values under W1 with drip irrigation increased from the early growing months (February) reached maximum during July and decreased gradually during September. Etcrop for the eight months were 2422, 240 and 241 mm during 2007, 2008 and 2009, respectively. WUE and FWUE under W1 with drip irrigation were always higher (0.21 and 8.19 ton ha-1 cm-1) than those of W2 with sprinkler irrigation (0.17 and 6.81 ton ha-1 cm-1). The crop was more efficient in using irrigation water during the cool period (January to March), and its efficiency declined during July to August every year. The highest value for the crop factor (1.33) was during early April to late June with decreasing values during mid July to mid August. The results showed that temperature over lucerne crop irrigated every eight days was always lower than that over bare ground near the crop. The air temperature over the crop decreased immediately after irrigation, compared to the temperature before irrigation. The crop water stress index (CWSI) indicates whether the crop was under water stress or otherwise. Irrigation every eight days did not result in water stress but under irrigation every 12 days the crop was water stressed during the time of measurement. The simultaneous measurements and calculated values are considered additional knowledge for irrigation scheduling
URI: http://khartoumspace.uofk.edu/handle/123456789/12609
Date: 2015-06-15


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