Calculating water requirement for drought relief based on soil hydrological characteristics of field

As a major agricultural county in Liaoning Province, Fuxin Mongolian Autonomous County is prone to drought, especially in spring, because of climate type and geographical location．In order to better serve refinement of agriculture, by measuring hydrological characteristics（constants）of field soil and referring to standard "Definition and Grading of Meteorological Drought" in Fuxin City, theoretical lower limit of precipitation required to relieve drought conditions at each level（10 to 20, 10 to 50 cm）, theoretical lower limit of precipitation required to relieve wilting drought conditions for experimental crops（corn, soybeans）at each level, and relative humidity representation of meteorological drought standards for experimental area and two comparative experimental areas, were calculated．Results indicated that amount of water needed to relieve withering drought varied depending on crop species and varieties．Experiment provided a scientific basis for research on drought resistance of field crops in Fuxin County．