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胡麻的营养生长期可分为幼苗期，机形期和快速生长期３个阶段。在旱境下胡麻前期生长量与水分利用率（即蒸腾系数的倒数）密切相关。试验表明，用简化法测定苗期，枞形期及快速生长期的蒸腾系数，具有品种间水分利用率的相对可比性和总蒸腾量的相对可比性，从而适用于在抗旱育种上使用。
Flax vegetative growth can be divided into seedling stage, machine-shaped and rapid growth phase of three stages. The amount of early flax growth in dryland is closely related to water use efficiency (ie, the reciprocal of the transpiration coefficient). The results showed that the transpiration coefficient of seedling stage, coniferous stage and fast growing stage was determined by the simplified method, which had the relative comparability of water use efficiency and the relative comparability of total transpiration, which was suitable for drought resistance breeding.