INFLUENCE OF DRIP IRRIGATION OPERATING AND MANAGEMENT USING SOLAR PHOTOVOLTAIC WATER PUMPING ON STRAWBERRY YIELD INSIDE GREENHOUSES

Field experiment was conducted at greenhouses site, Faculty of Agriculture, Kafrelsheikh University during winter season 2014 to study influence of drip irrigation operating and management using solar photovoltaic water pumping on strawberry yield inside greenhouses. .The variables were: daily solar radiation (W/m²) , emitters discharge (l/h), controlled greenhouse by (a solar heater, wet pads and fans), uncontrolled greenhouse, temperature (ᵒC) and relative humidity (%) inside two greenhouses. The main results summarized as follows: The maximum value of the electrical power output, (117.41W) and the panel efficiency (11.62%) at solar radiation (940W/m²). while, the maximum value of the subsystem efficiency and the overall efficiency (45.045 and 5. 64 %) at the minimum value of solar radiation (311W/m²) at 13.00 h during tested days. The distribution uniformity, emitter flow rate variation and manufacturing coefficient of variation were (72.59, 61.5 and 29.28%). The results showed the total amount of applied water was 100 and 153.7 l/m² for plants inside controlled and uncontrolled greenhouse. The obtained mean values of strawberry productivity were ( 42.43 , 36.55 , 57.32 , 61.08 and 64.97 gm/m² ) for controlled greenhouse and ( 18.33 , 20.91 , 28.38 , 43.29 and 48.26 gm/m² ) for uncontrolled greenhouse from December 2014 to April 2015 respectively. The water use efficiency related to the production of total fresh berry yields under controlled and uncontrolled greenhouse, it was 2.62 gm/l and 1.04 gm/l respectively.