对湘南红壤丘陵茶园土壤及茶叶中镁素含量进行了测定,结果得到土壤有效镁含量在6.29–25.98βmg/kg,平均为13.02βmg/kg,显示缺镁症叶片的有效镁含量为264.10βmg/kg。在缺镁茶园施用水溶性硫酸镁肥料后,缺镁症逐渐消失,产量比对照平均增长9.8%—13.6%。喷施含镁叶肥试验结果平均增产20.8%。施镁还能显著改善茶叶品质,氨基酸、咖啡碱及水浸出物含量分别比对照提高5.8%,9.2%、2.3%。文章还讨论了我国南方红壤丘陵茶园镁营养的现状及今后镁肥开发的思路。
关键词：
镁; 茶树; 红壤; 丘陵; 肥料; 营养; 产量; 品质
Magnesium content in the soils and tea leaves of hilly red soil tea gardens in the southern Hunan area were determined. Results showed that the contents of available magnesium in the soils ranged in 6.29—25.98βmg/kg, with average of 13.02βmg/kg, and the content of available magnesium in tea leaves with symptom of magnesium-deficient is 264.10βmg/kg. The magnesium-deficient symptom was disappeared after applying water-soluble magnesium sulphate, and tea yield was raised for 9.8%—13.6%. By using foliar-applying magnesium fertilizer, the average increase of tea yield reached 20.8%. Applying magnesium fertilizers can also improve tea quality notablely. Compared with the control, the contents of amino acids, caffeine and water extracts were increased for 5.8%, 9.2% and 2.3% respectively. The paper also discussed the situation of magnesium nutrition of tea gardens in hilly red soil area of the southern China, and the magnesium fertilizer developing strategy was suggested as well.
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