Physiological analysis of the effects of different soils on sugar beet crops in different years.
Sugar-beet was grown at 7 locations with different soil types in the E. of England and received 2 levels of N during 1960-2. Differences in yield between the locations and seasons were primarily associated with differences in LAI, which were associated with differences in soil N and water supply. NAR varied less than LAI and was smaller where yield and LAI were greater. On the more fertile soils, maximum LAI was attained in most years; hence, annual variations in average beet yields appeared to result mainly from the yield contribution of low-yielding soils. The national average yield could be increased if the shortages of N and water occurring on these soils in some years were relieved.-F.A.S.