行政院農業委員會台南區農業改良場  研究彙報第17號

抗蒸發劑及鈣對甘藍及結球蒿苣之頂燒病及鈣分佈之影響

陳榮五

摘  要

頂燒病是甘藍及結球蒿苣很普遍的因缺鈣而引起的生理病,其病徵在結球蒿苣是球內部葉片及外部葉片之葉綠焦化,而在甘藍則祇發生於內部葉片。頂燒病發生於外部葉片很早,但其病症到收穫時一直保持一樣,對植株本身無傷害作用。但發生於內葉當接近收穫時則非常嚴重而失去商品價值。

葉面施用抗蒸發劑及鈣可減少頂燒病之發生及增加球內部葉片之鈣含量。但不能完全控制頂燒病之發生。最有效的是同時使用抗蒸發劑及CaCl2,其次為施用CaCl2,然後為同時施用抗蒸發劑及Ca(NO3)2及單用抗蒸發劑,最差的是單用Ca(NO3)2。

葉面施用抗蒸發劑因仰制蒸散作用之故,有稍提高球溫度之現象,並有增加一些元素如K、P、Mg及B之含量之趨向。

全葉面施用抗蒸發劑在外葉片可仰制葉片之蒸散作用,刺激根壓面增加鈣之移動到內部葉片。


The Influence of Antitranspirant and Calcium Sprays on Calcium Distribution and Tipburn in Cabbage (Brassica oleracea var. capitata) and Lettuce (Lactuca sativa L.)

Y. W. Chen

Abstract

        Tipburn is a widespread physiological disorder of cabbage and lettuce, caused by calcium deficiency.  Symptoms of tipburn are necrosis on margins of outer and inner head leaves in lettuce, whereas in cabbage it is only on margins of inner leaves.  Tipburn on outer leaves may develop early, but symptoms remain the same until harvest.  Tipburn is more serious when it occurs on the inner leaves as heads approach maturity.

        In search of tipburn control, foliar calcium (Ca(NO3)2 and CaCl2) sprays were applied to the entire leaves to increase calcium content, and foliar Folicote antitranspirant spray was applied to outer frame leaves to reduce transpiration, stimulate root pressure flow and increase movement of calcium to inner leaves.

        Foliar sprays of antitranspirant, calcium and combined sprays of antitranspirant and calcium resulted in a degree of tipburn control and in an increase in calcium content of inner leaves, but failed to adequately control tipburn.  Most effective was a combined spray of antitranspirant and CaCl2, next were CaCl2, combined spray of antitranspirant and Ca(NO3), then antitranspirant alone and least effective was Ca(NO3)2.



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