Effects of preceding crops in rotation with winter and spring wheat.

摘要

The effects of oats, barley, potatoes and sugarbeet on the 1st and 2nd crops of winter and spring wheat, and the effects of turnip rape [Brassica campestris] and field peas grown alternately, were compared in 1981-89. Oats increased the first cropsof winter and spring wheat by 8-9%, while barley had no significant effect compared with continuous wheat. The turnip rape/pea combination increased grain yields of spring and winter wheat by 18 and 21%, respectively. Potatoes increased wheat yield by anaverage of 15% compared with continuous wheat, with the increase ranging from 40% at a low N rate to 6% with high N application. Averaged over 5 years, sugarbeet increased spring wheat yield by 18%, but the use of sugarbeet was later discontinued due tocultivation problems.