The effects of nitrogen applicationsat different periods through fertigationmethod on fruit yield and quality of Washington navel orange

In the present study, it was investigated the effects of N applicationsat different times and doses through fertigation in the spring and summer seasonson fruit yield and quality of Washington Navel orange. 1/2 of annual amount of N was applied from the soil in the spring. On the other hand, the remaining half is applied on plot 1 all at once, on plot 2 in three stages, on plot 3 in five stages, and on plot 4 in ten stages. According to results, the highest fruit size (average 77.55 diameter and 241.36 g) was determined in plot 1 in which N was applied in summer time all at once. The fruits which are high marketable at the rate of %51.83 were also determined in plot 1. Also, marketability was the lowest at a rate of %5 in plot 4. The smallest fruit diameter (average 71.18mm) and the lowest fruit weight (average 183.47 g) were determined in plot 4 in which N was applied in 10 stages during summer time.