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施钾对茶树幼苗营养元素吸收的影响

Effect of Potassium Fertilization on Nutrient Absorption of Young Tea Bushes

  • 摘要: 为明确不同施钾水平对茶树矿质营养元素吸收的影响,本研究采用沙培盆栽方法,以“瑞香”品种的10月龄扦插苗为试验材料,设5个钾处理浓度,分别为0、100、200、600、2000 μmol·L-1,每周浇3次含钾营养液,15周后,分别测定茶树植株根、茎、叶中Ca、Cu、Zn、Mn、Mg的含量。结果表明:不同施钾水平,影响茶树对矿质营养元素吸收与分配。当缺钾(供钾为0 μmol·L-1)时,茶树叶片Ca、Mn的含量明显高于茎部和根部,Mg、Cu、Zn含量均在根部最高。Ca在叶、茎中的含量与钾处理的浓度均呈负相关,在根部则呈正相关;根部 Cu、Zn的含量与钾处理浓度均呈正相关,而茎、叶中均呈负相关;Mn、Mg在根、茎、叶中的含量均与钾处理的浓度呈负相关。

     

    Abstract: This study aimed to determine the effect of potassium(K)fertilization on the nutrient absorption of tea plants. Vegetative propagated 10-month-old seedlings of the tea Camellia sinensis (L.) O. Kuntze cv. Ruixiang grown in pots were treated three times weekly for 24 weeks with the nutrient solution containing 0, 100, 200, 600 or 2,000 μmol K·L-1. The contents of Ca, Cu, Zn, Mn and Mg in the roots, stems and leaves of the tea plants were measured. The results showed that the K fertilization altered the nutrient absorption and distribution of the plants. When K was not supplied, the Ca and Mn contents in the leaves were higher than the other two parts, the Mg, Cu and Zn contents in the roots were highest. With the K fertilization, the regression analysis indicated that Ca in the leaves or the stems negatively correlated to the fertilization, and positively correlated in the roots. Whereas, the fertilization positively correlated to the Cu and Zn contents in the roots, but negatively correlated in the stems or the leaves, and, negatively correlated to the Mn and Mg in all parts.

     

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