Abstract
The experiment was conducted on apple trees cv. Golden Delicious,12 years old planted at a distance of 4 × 4 m in a private orchards in Bagerat village (25 km northeast of the city of Dohuk), during the growing season 2012,to study the effect of Matrix 15 and ascorbic acid on yield and some chemical fruit parameters. Three levels of Matrix15 (15% humic acid) (0, 10 and 20 ml /L./ trees) were applied in two installments during the season (1/2L to Trevi each batch), the first after flowering (mid of April 15/4). The second after one month, and the trees were sprayed until wetness with three levels of of ascorbic acid (0, 150 , 300 mg /L.) and three times during the season of the study. All the spraying and sprinkles and addition were done early of the morning. Result showed that application of Matrix15 fertilizer (15% humic acid) significantly affected the fruit set , number of fruits at harvest ,yield of each tree, percentage of total acidity ,total sugars and ascorbic acid in fruit juice. Olso the spraying of ascorbic acid especially the concentration 150 mg /L. significantly increased the number of fruits at harvest ,yield of each tree mean while the foliar spray of 300 mg/L. significantly increased the percentage of total sugars in fruit juice. The interaction between the factors significantly affected on all studied parameters except fruit volume and TSS.
