西瓜断根嫁接育苗根际营养体积对根系活力和秧苗质量影响

采用3种不同深度的50孔穴盘进行断根嫁接西瓜苗试验。试验证实：嫁接苗龄20 d时，处理期间株高、茎粗、叶面积、叶片数等生物学特征无显著性差异，与根际营养体积无显著性相关关系。嫁接苗龄25 d之后，3个处理之间表现出株高、地下部干重、叶面积指数、壮苗指数及根系活力与根际营养体积间呈显著相关关系，78.4、82.9 cm³的孔穴体积抑制了秧苗的生长和根系生理活性。分析研究认为：孔穴为78.4 cm³和82.9 cm³的穴盘苗嫁接后最佳苗龄为20 d，最长不宜超过25 d；孔穴为131.6 cm³的穴盘苗嫁接后苗龄可达30 d。

Influence of plug cell size on root vigor and seedling quality of graft watermelon seedling

Three kinds of plug trays were used to grow watermelon seedlings which were grafted on shoot with root cutting. The results showed that there was no significant difference among treatments when the seedling age was 20 days after being grafted. Plug cell sizes at 78.4 cm³, 82.9 cm³ restrained seedling growth and root vigor when the seedling age was 25 days after being grafted. Seedling root length, root dry weight, leaf area index, and root vigor were noticeably correlated with plug cell size. It is suggested that the best seedling age is 20 days and no longer than 25 days for the plug cell size of 78.4 cm³, 82.9 cm³. Seedling age can be 30 days for the plug cell size of 131.6 cm³.