Effects of Water Stress and Fertilization on Yield and Protein of Forage Maize Under Fertigation System

To save and protect of water resources, optimizing of water use in agriculture is inevitable. This research was carried out to study effect of water stress and fertilizer on grain yield and protein content of forage maize. In this regards a factorial experiment design with three replicates was conducted in the experimental field research of ShahrekordUniversity during spring and summer 2010. Experiment factors were irrigation in the four treatments (supplying 60, 80,100 and 120% water requirement, named I2, I3 and I4, respectively). Fertilization was included five levels, supplying 0, 60, 80,100 and 120% of the recommended nutrition. Mentioned treatments were named F0 -as control level, F1, F2, F3 and F4, respectively. The fertilizers were applied by fertigation. Results indicated that grain yield and protein in maize are significantly affected by water amount, fertilizer level and their interaction. Among irrigation treatments the maximum grain yield (18570 Kg/ha) obtained under I4 treatment, which wasnt significantly different from that of I3 treatment (α