河北省中北部低洼地带,常在7月前后有洪水或沥涝,必须播种早熟作物。多年来实行着一水一麦耕作制,除部份秋脱地按时播种秋麦外,春脱地大部于2月间趁土壤表层解冻期间抢种“七九麦”(注一),以便提早在洪水沥涝前成熟。七九麦在水涝区较一般晚熟作物生产稳定,但也 Low-lying areas in central and northern Hebei Province often have floods or floods before and after July and must sow precocious crops. For many years, a system of water and wheat farming was practiced. Most of the spring off-season land was planted during the period of thawing in the soil in February, So as to mature earlier before flooding. Seventy-nine wheat in the waterlogged area than the average late-season crop production is stable, but also