为了克服确定作物需水量所遇到的困难,该文介绍一种简单、可靠、易掌握、实用的生物气候测定方法.该方法根据被测地的土壤、气候和作物参数,得到玉米在生长季节的光水热系数平均值为0.15 mm/℃.该方法应用于南斯拉夫伏霍基拉省取得成功.由于光水热系数是由各地的特殊条件确定的,只要确定了该系数,该方法可在任何地方应用.灌溉时间和灌溉强度以及干旱的发生都可由该方法确定.玉米生长期的需水量为467 mm.“,”To overcome the difficulty in determination of ETP, an easy,simple,reliable and practicable Bioclimatic approach was adopted. Based on local information (soil, climate and crop parameters) hydrophytothermic coefficients for maize were established and average value for growing season was found to be 0.15 mm/℃. Its application was found successful in Vojvodina Province. This method can be used in any region by establishing the hydrophytothermic coefficients for that region as the scope of its application is limited only to that specific region for which hydrophytothermic coefficients are established. Timing of irrigation to mitigate the occurrence of drought can also be determined by this method. The seasonal ETP for maize was 467 mm.