关键词: 无籽西瓜, 中熟, 品种

Abstract: ‘Nongkeda 21’is a new mid-maturation seedless watermelon cultivar which was selected from the cross-combination of MD06 and F16. It is suitable to cultivate in the open field of northern China in the spring．The whole growth period of‘Nongkeda 21’is about 110 days，and the period for fruit development is around 35 days. It has a vigorous growth potential with an average single fruit weight of 6.5 kg and a yield of 52.5 t ? hm-2. The fruit shape of‘Nongkeda 21’is oval and its shape index is 1.0. The fruit skin is dark green，and the pericarp thickness is about 1.2 cm. The fruit flesh is red fine sandy. The center sugar content is 12.5%，value of that is close to the edge sugar content. More importantly，this cultivar has a high resistance to disease and other adverse stimuli.

Key words: seedless watermelon, mid-maturing, cultivar