芹菜雖屬冷涼作物，然在市場需求下已成周年栽培。唯多年來產地農民認知芹菜確有連作障礙問題，本試驗乃以‘西螺種'芹菜為試驗材料，進行砂耕芹菜定植後不同週數之灌溉排液對芹菜種子發芽之影響試驗。結果顯示，砂耕芹菜灌溉排液之pH值隨芹菜生育期增加而下降，其總酚類化合物含量則在芹菜定植後第七週達高峰，濃度為119.95μg/ml。砂耕芹菜灌溉排液處理並造成芹菜種子發芽率降低、平均發芽天數及發芽達50%所需天數(GT50)增加、發芽不整齊且抑制芹菜種子胚根伸長。Celery is cultivated year-round to meet the market demand in subtropical Taiwan although it is a cool-season crop. For many years, the farmers have realized that celery is a crop having serious problems in continuous cropping which causes much loss to farmers every year. The objectives of this research were to study the allelopathic effects of celery on celery itself. Results indicated that, the pH value of the leachant collected from celery grown in sand culture decreased as the plant age increased. The total phenolic compound content of the leachant reached the peak at 119.95μg/ml in the seventh week after transplanting. Celery seeds treated with the leachant collected from sand culture had lower germination rates, longer average germination time and GT50 as compared to the seeds treated with underground water. The leachant treatment also caused the inhibition of radical elongation and the abnormality of sprouting
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