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对取自我国茶叶主产区浙江等 7省共 2 87个土壤样品交换性镁含量的分析表明 ,0～ 2 0cm和 2 0～ 4 0cm土层含量低于 4 0 μg/g的比例分别为 5 7.9%和 6 4 .0 % ,并表现自北向南逐渐降低的特征。不同茶园土壤非交换性镁的释放强度 (5次 1mol/L中性NH4OAC连续提取量 )与其总量 (1mol/LHNO3 煮沸提取 )呈显著正相关 (r =0 .6 78 ,n =17)。在浙江等地进行的田间试验 (土壤交换镁含量 2 0～ 6 9μg/g)表明 ,施镁平均增产茶叶 5 .7%。施镁增加茶叶游离氨基酸含量 ,增加范围 1.2 %～ 16 .8% ,平均 7.0 % ,这可能与施镁显著增强硝酸还原酶活性 ,从而改善对氮素的吸收和利用能力有关
The analysis of exchangeable magnesium content in a total of 2 87 soil samples taken from 7 provinces including Zhejiang in Zhejiang Province, the main producing area of tea, showed that the proportion of 0 ~ 20 cm and 20 ~ 40 cm soil layers below 40 μg / g were 5 7.9% and 6.4%, respectively, and showed a gradual decrease from north to south. The release intensity of non-exchangeable magnesium in different tea plantation soils (5 consecutive 1mol / L neutral NH4OAC continuous extraction) and its total amount (1mol / LHNO3 boiling extraction) showed a significant positive correlation (r = 0.788, n = 17). Field experiments in Zhejiang and other places (soil exchange magnesium content 20 ~ 69μg / g) showed that the average yield of tea increased by 5.7%. Applying magnesium increased the content of free amino acids in tea, increasing the range of 1.2% ~ 16.8% with an average of 7.0%. This may be related to the application of magnesium to enhance the activity of nitrate reductase and improve the ability of nitrogen absorption and utilization