Influences of Heavy Application of Nitrogen on Soil Acidification and Root Growth in Tea Fields
Influences of Heavy Application of Nitrogen on Soil Acidification and Root Growth in Tea Fields
复制标题
DOI：
10.1626/jcs.64.516
复制
发表时间：
1995-09
影响因子：
--
通讯作者：
Naoaki Tachibana;S. Yoshikawa;K. Ikeda
中科院分区：
文献类型：
--
作者：
Naoaki Tachibana;S. Yoshikawa;K. Ikeda
我们调查了三重县北部绿茶产区的实际施氮水平，并调查了茶田土壤和根系生长的理化性质。年供氮量为5.8 ~ 28.3kg a-1，平均14.7kg a-1。年平均磷酸和钾含量分别为5.7和4.6kg a-1。在调查的茶田中，11%的茶田每年施用的氮肥超过20kg -1。当施氮量超过14.0kg a-1时，行间土壤最表层（0 ~ 20cm）的白根明显减少，而当施氮量超过18.0kg a-1时，白根未出现。随着施氮量的增加，行间土壤酸度（H2O）由pH 5.9下降至2.9。行间土壤最表层呈强酸性，pH值低于4.5。行间收集的土壤溶液阴离子主要由NO3-和SO42-组成，阴离子浓度大于阳离子。在用铝离子补偿阳离子缺失的情况下，土壤酸度保持在pH 3。
We surveyed the actual levels of nitrogen application in the productive region of green tea in northern Mie prefecture and investigated the physico-chemical properties of the soils and root growth in the tea fields. The annual quantity of nitrogen supplied ranged from 5.8 to 28.3kg a-1, giving 14.7kg a-1 on average. The annual quantities of phosphoric acid and potassium were 5.7 and 4.6kg a-1 on average, respectively. More than 20kg a-1 of nitrogen had been applied annually for 11% of the surveyed tea fields. White roots in the topmost layer(0∼20cm) of inter-row soil were considerably reduced when nitrogen exceeding 14.0kg a-1 was applied and were not found when the amount of nitrogen exceeded 18.0kg a-1. The soil acidity (H2O) in the inter-row decreased from pH 5.9 to 2.9 with an increase in the amount of nitrogen applied. The topmost layer of inter-row soil was highly acidic lower than pH 4.5. Anions in the soil solution collected in the inter-row were mainly composed of NO3- and SO42- and the concentration of anions exceeded that of cations. The soil acidity was kept at pH 3 when alminium inos were available to compensate for the lack of cations.