Document Details

Document Type : Article In Conference 
Document Title :
Effect of irrigation frequency and timing on tomato yield, soil water dynamics and water use efficiency under drip irrigation
تأثير ميعاد الري ووقته علي كمية محصول الطماطم – توزيع الرطوبة الأرضية وكفاءة استخدام المياه تحت نظام الري بالتنقيط
Document Language : English 
Abstract : Effect of irrigation frequency and timing on tomato yield, soil water dynamics and water use efficiency under drip irrigation Saleh M. Ismail1, Kiyoshi Ozawa2 and Nur A. Khondaker3 1Soil & Water department, Faculty of Agriculture, Assiut University, Assiut, Egypt, Email: 2Japan International Research Center for Agricultural Science (JIRCAS) Okinawa Subtropical Station, Ishigaki Island, Okinawa, 907-0002 Japan 3 Bangladesh Agricultural Research Council, Farmgate, Dhaka 1215, Bangladesh ABSTRACT Two experiments were carried-out to study the effect of irrigation frequency and timing on root developments, tomato yield (var. First power) and soil water content at JIRCAS Okinawa Subtropical Station, Ishigaki, Japan. The first experiment was conducted in root containers (31 x 15 x 60 cm) with one transparent side for visual viewing of the root development. Sandy clay loam soil mixed with CaCO3 and P2O5 fertilizers was packed in the containers to 50 cm height with bulk density of 1.5 g/cm3. Three irrigation frequencies, 1, 3 and 5 days were investigated. The soil water content in the containers was kept at field capacity by compensating the loss in weight by adding water. The second experiment was conducted in a greenhouse with two irrigation frequencies, 1 and 3 days and three irrigation timings, early morning (8:00h), afternoon (14:00h) and night (20:00h). Soil water content at 0-60 cm and soil temperature at 15 cm depth were measured at 15 cm distance far from dripper by installing TDR sensors and thermocouples, respectively. The supplied amount of water was the same for all irrigation frequencies and gradually increased to cover the crop water requirements during each growing stage. The root containers results indicated that increasing water supply increased the root development and root biomass. The 1-day irrigation frequency produced the highest root biomass while the least root biomass was obtained from the 5-days irrigation frequency, indicating that water stress promoted the development of root system in the deeper layer where available soil moisture content was higher than the top layers. The 5-days irrigation frequency saved 18% and 12 % of water at early growth stage compared to 1 and 3 days frequencies. The results of greenhouse experiment showed that the best irrigation frequency was 3-day. The average yield in 3-days frequency was 70 ton/ha while 63 ton/ha in 1-day frequency. The effect of irrigation timing varied with irrigation frequency. For 3-days frequency, irrigation at early morning was better than afternoon and night irrigations. The average yield for irrigation at early morning was increased by 15% and 14% than irrigation at afternoon and night, respectively. For 1-day frequency irrigation at night increased the yield by 11% and 3% than irrigation at early morning and afternoon correspondingly. The lowest soil water content and soil temperature were displayed by the treatment, which produced the highest yield. With the same amount of water, the early morning irrigation after every 3-days increased tomato yield by 11- 20 % compared to night and early morning irrigation of 1-day frequency. A similar increase in water use efficiency in the early morning irrigation every 3-days was also recorded. Therefore, a selection of the proper irrigation frequency and timing led to a higher yield and high water use efficiency 
Conference Name : Proceeding of the Eleventh International Water Technology Conference, 15 –18 March, Sharm El-Sheikh, Egypt. Vol 1 P 69-84 
Publishing Year : 1428 AH
2007 AD
Article Type : Article 
Added Date : Tuesday, October 11, 2011 


Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
صالح محمود اسماعيلIsmail, Saleh


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