A field experiment was conducted in new reclaimed areas to improve avocado trees water productivity cultivated under deficit irrigation and mulching. The deficit irrigation treatments were 90, 80, 70, and 60% of reference evapotranspiration (ETo). Results revealed that The average water requirements during different avocado trees physiological growth stages were 613, 1509, 1755, 1391, and 632 m3 /fed for flowering to end of fruit set, fruit set to approximately 50% of the expected market fruit size, during the fruit growth stage, during the fruit ripening stage, and during the flower bud formation stage, respectively. These values represent approximately 10.4%, 25.6%, 29.7%, 23.6%, and 10.7% of the total yearly water requirement. The averages irrigation frequency were 2.45, 2.61, 2.72, 2.87, and 3.91day for 100, 90, 80, 70 and 60% ETo treatments, respectively. The highest crop water productivity value of 1.24 kg/m3 water was attained at 70% ETo followed by 1.18 kg/m3 water at 80% ETo while the least crop water productivity (1.06 kg/m3 water) was realized at 100% ETo. The crop water requirement of 5110 m3 /fed/year with high irrigation frequency is recommended for mulched sandy soil cultivated with avocado trees.

The field experiment was established at the experimental farm of the Horticultural Research Station of Barrage, Qalyubia Governorate during 2014 and 2015 growing seasons to evaluate the impact of irrigation levels i.e.,120, 100, 80 and 60% of the evapotranspiration (ETc) and stress alleviation substances (seaweed extract, potassium silicate and abscisic acid against control treatment) on growth, corm yield and quality of taro (Colocasia esculenta cv. Balady), with a particular attempt  to establish irrigation water strategy for taro cultivation. The results indicated a reduction in plant growth and corm yield as well as quality due to minimizing irrigation level from 120 to 60% ETc. But the highest water use efficiency (WUE) was obtained with 80% irrigation level. Seaweed extract showed a superior enhancement in all measured vegetative, yield and quality parameters followed by potassium silicate compared to abscisic acid or control. Seaweed extract heightened the WUE compared to other substances. Results concluded that using 80% irrigation level accompanied by spraying plants with seaweed extract  led to a mild reduction in the plant growth, yield and quality but conferred the higher WUE compared to other interactive treatments.

field experiment was conducted in newly reclaimed sand soil to find out the most efficient combination between irrigation system and deficit irrigation management can be used for date palm trees “Zaghlol cultivar”. Results revealed that the average water requirements of date palm trees gradually increased from 1504, 1279, 1128 and 978 for drip to 2522, 2143, 1891, and 1639 m3/fedSeason for bubbler irrigation system in combination with 100, 85, 75 and 65% deficit irrigation treatments respectively. Data indicated that EC1:5 in dS/m gradually increased with decreasing deficit irrigation levels from 100 to 65% and with increasing soil layer depth to 60-90 cm either in parallel or perpendicular direction of drip or bubbler irrigation lines. While opposite result was observed for soil moisture distribution. Results showed an evident decrease in crop yield as affected by water stress associated with decreasing deficit irrigation treatments from 100 to 85, 75 and 65 % by about 167, 155, 153, 151 for drip and 181.5, 168, 172 and 169 kg/Tree for bubbler irrigation systems. Data revealed that water use efficiency increased from 0.10 for 100 % DI to 0.93, 0.83 and 0.64 m3/kg for 85, 75 and 65 % deficit irrigation under drip and slightly decreased from 0.16 for 100 % DI to 0.14, 0.12 and 0.11 m3/kg for bubbler irrigation systems respectively. It could be concluded that the best method for managing irrigation of date palm trees "Zaghloul cultivar" in the study area is the irrigation using bubbler system with 75% deficit irrigation  treatment. This combination treatment gave acceptable yield of about 172 kg/tree with saving a substantial amount of Irrigation water reached to about 25% (1891 m3/fed or 22 m3/tree) with WUE of about 8.09 kg/m3.