The res- ult showed that the content of each element in persimmon leaves indicated a regular change, as its phenological periods advanced.
结果表明：随物候期的进展，柿树叶片内各种营养元素的含量呈有规律的变化。
Taking county as an element the agricultural drought disaster vulnerabilities of Hebei Province in different periods are assessed.
以县域为单元，对河北省不同时段的农业旱灾脆弱度进行了评估。
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