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Table 2.

Productivity of crop rotations depending on the duration of research and fertilization, GJ* ha-1 * year-1.

Crop rotations Fertilizer variants
O1 O2 O3 O4
1st rotation cycle
I 64.2 68.0 65.7 69.1
II 65.0 69.1 65.3 70.3
Last (5th) rotation cycle
I 55.6 62.0 58.5 67.4
II 58.0 62.9 59.3 68.8
Average for 1992‐2015
I 57.8 63.8 60.3 68.7
II 59.2 64.7 61.5 69.9

Note: I and II are crop rotations with black and green manured fallows, respectively.

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