Effect of Planting Date and Inorganic and Organic of Nitrogen on Growth and Yield of Kohlrabi (Brassica oleracea var. Gongylodes)

Abstract

A field experiment was conducted on Kohlrabi (Brassica oleracea var. gongylodes) ‘White Vienna cv.’ at the Experimental Station of the Department of Horticulture and Landscape, College of Agriculture, Tikrit University, Salah al-Din, Iraq, during the winter season of 2021-2022 under drip irrigation system. This study aimed to investigate the effect of planting time and different combinations of nitrogen on the growth and yield of kohlrabi plants. Results showed that the first time of planting, 2/8 recorded the highest values in most characteristics of vegetative growth and all characteristics of yield. On the other hand, using a combination of nitrogen at 25% mineral + 75% organic improved plant growth and yield compared to different fertilizer combinations of nitrogen. Interaction treatment between the first time of planting 2/8 and a combination fertilizer of nitrogen at 25% mineral + 75% organic gave the best growth and increased total yield compared with other interaction treatments.