الفهرس 
Title : Impact of Sprinkler, Bubbler and Micro-Jet Irrigation Systems on the Productivity of Mature Valencia Orange Trees Under Drip Irrigation System
AbstractOnly 14 pages are availabe for public view
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Abstract
Limitation of water resources and soil salinity under drip irrigation system were considered a critical problem on productivity of the mature Valencia orange treesin arid and semi arid areas.Therefore, the aim of this research was to determine a suitable irrigation system for increasing the productivity under soil salinity and scarcity of water resources. Two seasons field experiment was executed through 2018 and 2019 in Egypt inside a private orchard located at the latitude of 30 40{u2019} 16.4283 N and longitude of 30 4{u2019} 33.0243 E and 30 m above the mean sea level. The study covered 168 mature Valencia orange trees (Citrus Sinensis) with 14 years old covered 1Acreage. The trees were cultivated on 4 meters between trees and 6 meters between laterals in loamy sand soil influenced by salinity which electric conductivity (EC) was 2.9 ds m-1 in average. Factorial experiment in complete randomized block design was used as statistical approach through data collection and its analysis. Four irrigation systems 2Sprinkler (SI), bubbler (BI), micro-jet (MI) and fixed drip (DI), and two levels of water application2100% and 75% of ETc (m3/Acreage/year) were applied as an engineering treatments.The results showed that using treatment with 100% of applied water, gave high moisture and low salinity (together) in descending manner under the irrigation systems(SI. BI, MI and DI), respectively.The highest flowering and yield per tree increased as the wetted zone increased using the (SI) system. Whereas, fruit set and fruit DROP were higher under the (DI) than that of other systems.Comparing between 100% and 75% of irrigation treatments according to water use efficiency (water productivity), it was found that the second treatment was highest in (SI) system, whereas that of (DI) system was the lowest