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利用PEG6000模拟干旱环境，通过对玉米种子在不同水分环境下的萌动，萌发及出苗三个阶段水分需求的量化研究表明：种子的抗旱性随吸水进程的推动而减弱；种子达到萌动，萌发及出土成苗所需时间（t）与外界环境水势（W）之间1／t＝a＋bw的关系，据此推算出玉米种子在不同成苗阶段的需水阈值，发现种子在不同成苗过程中对环境水分的反应不同，抗旱性也不同。
Using PEG6000 to simulate the drought environment, the quantification of water requirement in three stages of germination and emergence of maize seeds under different water conditions showed that: the drought resistance of the seeds weakened with the progress of water absorption; the seeds germinated, germinated and unearthed The relationship between the time required for seedling emergence (t) and the external environmental water potential (W) 1 / t = a + bw, thus calculated the seedling threshold of maize seedlings in different stages of seedling, seed found in different seedlings in the process of Different environmental water response, drought resistance is also different.