Agriculture Reference
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grass sod being ploughed in. In permanent grassland, Garwood
et al
.
(1977) found 22.8 t ha
−1
of macroorganic matter in the top 15 cm which
corresponds to 13 t C ha
−1
. The rate of N loss in the first 30 years of arable
cultivation is underestimated in the simulation by > 1000 kg N ha
−1
, corre-
sponding to 40 kg N ha
−1
annually. The differences in arable management
Fig. 2.3.2.
Comparison of simulated and observed course of N in the soil after grassland plough-
ing (GP): (a) total N (humus + N
mic
) related to management as rape rotation, residues returned
(Y/N) and yield potential (maX/miN) and (b) N
mic
(G/GP
r
; A
q
) related to model parameterization.
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