Document Type : Articles
Authors
1 Department of Horticulture and Landscape, College of Agriculture, Tikrit University, Iraq
2 Department of Horticulture, College of Agriculture, University of Tikrit, Salah Al-deen, Iraq.
Abstract
The current research aimed to know the effect of sowing date and fertilizers rate of mineral and organic on qualitative of kohlrabi. This study conducted on Kohlrabi (Brassica oleracea var. gongylodes) cv. White Vienna at the Experimental Station of the Department of Horticulture and Landscape, College of Agriculture, Tikrit University, during the winter season of 2021-2022. The experiment carried out according to Randomized Complete Block Design (RCBD) with three replications. The experiment consisted of two factors. First factor included three dates of sowning viz, 2/8, 16/8. and 1/9. Second factor included five levels of nitrogen combination i.e. (100% mineral (N), 75% mineral (N) + 25% organic (N), 50% mineral (N) + 50% organic (N), 25% mineral (N) + 75% organic (N) and 100% organic (N). The results showed that sowing date 2/8 recorded highest values in percentage nitrogen and potassium in kohlrabi leaves and percentage of acidity in knob. While, sowing dates 16/8 and 1/9 recorded highest values in total dissolved solids (TSS) in knob and content of vitamin C in knob respectively. On the other hand, using 25% (N) mineral+ 75% (N) organic improved all studied of quality characteristics except percentage of acidity in knob compared to other fertilizer treatments. Therefore, the interaction treatment between sowing date 2/8 with 25% (N) mineral+ 75% (N) organic increased percentage of nitrogen, phosphorous and potassium in the leaves, acidity and content of vitamin C in the knob.
Keywords
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