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Yield Parameters as Affected by Introduction or Discontinuation of Catch Crop Use

^a Dep. of Crop Physiology and Soil Science, Tjele, Denmark
^b Dep. of Agricultural Systems, Biometry Research Unit, Danish Institute of Agricultural Sciences (DIAS), Research Centre Foulum, P.O. Box 50, DK-8830 Tjele, Denmark

View larger version (61K): [in a new window]   Fig. 1 Experimental plan and field layout, 1993 to 1997

View larger version (20K): [in a new window]   Fig. 2 (a) Grain yield and (b) N concentration in grain as function of present N rate (average of years, previous N rates, and mentioned treatments). Symbols for grain yield represent means of log-transformed measured values retransformed to the original unit. In the expression of estimated values, N is the N rate

View larger version (23K): [in a new window]   Fig. 3 Grain yields as function of year (average of previous and present N rates). Symbols represent means of log-transformed measured values retransformed to the original unit. Lines represent estimated values

View larger version (19K): [in a new window]   Fig. 4 Grain yield as function of N uptake in grain and straw in 1993 in autumn-plowed treatments. Symbols represent measured values of two previous N rates. In the expression of estimated values, N is the N uptake in grain and straw