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缺鎂跟缺鐵很像都是黃化易混淆
葉尖和新葉變成淡綠色或淡黃白色,留下綠色的葉脈,最終整個葉子變成淡黃白色。缺鐵建議以EDTA鐵葉面補充即可
可能發生的情況
(1)它傾向於發生在鹼性土壤中。
(2)過量施用磷酸肥料也有可能發生。
(3)當根係因過度乾燥,過度潮濕,低溫等而受損時,根系的活性往往會降低。
(4)當由於過量的銅,鋅和錳而與鐵的拮抗作用抑制了吸收時,趨於發生。
(5)在水耕法中,當不使用鐵製劑或使用無機鹽例如硫酸亞鐵的鐵製劑代替螯合鐵時,很可能會發生這種情況,螯合鐵具有穩定的溶解速率,可抵抗pH波動。
診斷要點
(1)鐵是難以在植物體內移動的元素,並且在活躍生長的葉尖中強烈出現缺乏症狀。
(2)如果無法根據症狀區分鐵缺乏症和錳缺乏症,則需要花費一些時間來分析或選擇4至5個受損菌株,並進行葉面噴灑鐵劑或錳劑以判斷是否存在噴灑效果。 ..
(3)檢查土壤是否被鹼化。
(4)檢查土壤乾燥或高濕度是否導致根系功能惡化。
(5)在水培法中,確認用於培養液的鐵劑類型以及是否存在鐵劑。
四。對策
(1)保持土壤pH值在5.5到6.5之間,如果土壤從中性向鹼性傾斜,則不要施用鈣質肥料等鹼性材料,並積極進行硫化和添加硫,使土壤反應趨於酸性。 施用生理酸性肥料,例如低級化學藥品。可選地,使用降低pH的材料例如硫花或硫酸亞鐵校正pH。
(2)不要大量施用磷肥,但要適當施用。如果土壤中的磷酸鹽含量高,請減少施肥量。
(3)塗抹約2kg / 10a的鐵螯合物以補充鐵製劑。
(4)認真管理土壤的水分,以防止土壤過度乾燥和過濕,並長出健康的根。
(5)如果在水耕法中使用無機鹽鐵製劑,則用溶解速率穩定的螯合鐵製劑代替。注意,如果用紫外線對培養液進行滅菌,則螯合的鐵可能分解並且鐵可能沉澱。
(6)作為緊急措施,噴灑0.1%的硫酸亞鐵葉面噴霧,注意不要造成化學損害。
圖片來源:日本網站、以色列網站
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TWD $99,999,999
TWD $99,999,999
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