IMPACT OF BUBBLER IRRIGATION SYSTEM DISCHARGES AND IRRIGATION WATER AMOUNTS ON MAIZE: 1-IRRIGATION EFFICIENCY, GROWTH, GRAIN AND BIOMASS PRODUCTION

The aims of this research work were to study the effect of two bubbler irrigation drippers discharges (BIDD) were: a) 8 LPH and b) 12 LPH, and different water amounts treatments from evapotranspiration (ET): 100 %, 75 %, 50 % on maize (Zea mays-L, HF-10 Varity) vegetative growth, grain and Biomass yield. Vegetative growth and yield included: leaf area, Leaf length, leaves number per plant, Plant height, grain yield, and Biomass yield. The experiments design was split in randomized complete block with three replicates. To carry out items mentioned above a field experiment for one growing season (2013) was conducted in Sandy soil at the Agricultural Research Field of National Research Center, El-Nobaria, Egypt. Irrigation water was added in order to compensate for ETc of maize and salt leaching requirement. Data on hand could be summarized as follow:The effect of different discharges of BIDD on bubbler irrigation system efficiencies, overall bubbler irrigation efficiencies, andeffective bubbler irrigation efficiencies, Data could be ranked in the following descending orders: 8 LPH > 12 LBH and based on these results, with decreasing of bubbler drippers discharge will be increasing and give the greater all efficiencies and vice versa.Parameters under study could be ranked in following descending orders: 8LPH > 12 LPH and 100 > 75 > 50. In respect to (BIDD and ET %) effect on maize biomass yield, one can notice significant difference at the 1 % level between all means values of BIDD and ET %. According to the interaction effect of the investigated factors, the highest and lowest values of maize biomass yield recorded under interactions of 8LPH X 100 and 12LPH X 50. These results due to the treatments of 100 % ET and 75 % ET were covered water requirements and also recorded convergent results in values which means that the amount of water added, which is the difference between the 100 - 75% = 25% ET, it amounts in excess of the plant required under the current conditions of the experiment. So it can be recommend to using 75% for saving 25% from water requirements under bubbler irrigation system using 8LPH treatment.