Effect of Length of Fallow Period on Water Storage and Drainage

摘要

Double fallowing involves the addition of another year to the 14-15 month fallow period between winter wheat crops. A field experiment was carried out to hydrologically evaluate the effect of tillage practices and the amount of residue at the beginning of fallow on the amount of water storage and drainage. Tillage practices minimizing the number of tillage operations (by use of chemicals for weed control and residue maintenance) provided the greatest water storage and drainage. Deep chiseling at the start of the fallow period added further to water storage and drainage. Models are described for estimating double fallow capability by continuous computer simulation.