Abstract
This study was conducted at experiment Farm of Horticulture and Landscape Design Dep. / College of Agriculture and Forestry / Mosul University during the growing season 2012-2013 to investigate the effects of three levels of nitrogen fertilizers at rate: zero, 100 and 150 Kg N / ha. The second factor included adding two types of organic fertilizer (humic acid): Matrex 15at 2 ml/ l. and Fitohum at 2 gm/ l. and control treatment, in order to study their effects on the vegetative growth, quantity and quality of the yield of two garlic varieties (Chinese and local). The result showed that local variety was significantly superior in head circumference and bulbs fresh weight per plant at second stage (220 days after planting), cloves and circumferences number per head Whereas, Chinese variety was significantly superior than local variety in leaves number per plant at two growing stages (167 and 220 days after planting).The vegetative growth and quantitative and qualitative characters of the yield i.e. leaves number, head circumference and bulbs fresh weight per plant at second stages (220 days after planting), cloves and circumferences number per head, mean weight of clove, total and marketable yield increased by increasing nitrogen fertilization levels. Whereas, the fertilized plants with 150 Kg N/ha. were significantly more superior than non-fertilized and fertilized plants in the previous mentioned characters. Whereas, plants fertilized with organic fertilizer Fitohum were significantly superior than non-fertilized plants and fertilized plants with organic fertilizer Matrex 15 in head circumference, bulbs fresh weight per plant (at two growing stages) and total and marketable yield. The result indicted that local variety plants that fertilized with nitrogen fertilizer at level 150 Kg N/ha and organic fertilizer Fitohum gave the highest values of total yield and marketable yield 10.998 and 10.992 ton / ha. for previous traits respectively.
