生产实践告诉我们,盐碱地上的作物在遭受盐害初期,可以应用某些农业技术措施部分地或大部分地消除盐害影响,争取较好的收成。生产实践还告诉我们,盐害一旦在植株形态上反映出来,尽管采取了某些农业技术措施去消除它,但为时已晚,作物的生长发育和最后产量,仍将受到一定程度的影响。因此人们设想,盐害能否在作物形态上表现出来之前进行预报? Production practice tells us that in the early stage of salinization of crops on saline soils, some agricultural techniques may be applied to partially or largely eliminate the salt damage and strive for a better harvest. Production practice also tells us that once the salt damage is reflected in the plant morphology, it is too late for the agricultural technology measures to be taken to eliminate it. However, crop growth and development and the final output will still be affected to some extent. So one envisaged that salt damage could be predicted before crop morphology appeared?