For winter wheat on the clay, where the soil was freely-drained during the winter, drought depressed total shoot weight by 344 g/m 2 (17%) and grain weight by 137 g/m 2 (17%), but after winter waterlogging, drought did not further depress total or grain weight. The drought treatment reduced the straw weight of winter barley by 75 g/m 2 (12%) but did not significantly depress the grain yield. Winter waterlogging restricted tillering and restricted the number of ears for all crops grain yield of the winter barley was decreased by 219 g/m 2 (30%), and that of winter wheat by 170 g/m 2 (24%) and 153 g/m 2 (21% on the clay and sandy loam respectively. The lysimeters then were either irrigated so that the soil moisture deficit did not exceed 84 mm, or subjected to drought by limiting rainfall (equivalent to a 1 in 10 dry year in the driest area of England) so that the deficits reached maximum values of 150 mm in the clay and 159 mm in the sandy loam by harvest.

Lysimeters were either freely-drained during the winter or waterlogged with the water table 10 cm below the soil surface from 2 December until 31 March (that could occur by rainfall with a return period of 2 to 3 years). Winter wheat was grown on a clay and on a sandy loam, but winter barley only on the clay soil. We used lysimeters containing soil monoliths with facilities to control the water table and a mobile shelter to control rainfall.

The effects of winter waterlogging and a subsequent drought on the growth of winter barley and winter wheat have been examined.

Cracked by R.K. Belford