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Table 2.

The influence of predecessors, tillage methods and fertilizers on the yield of winter wheat, protein and nitrogen content in the grain during full ripeness, and the removal of nitrogen (on average for 2004–2007).

Soil treatment Fertilizers Crop yield, thousand/ha Protein in grain, % N in grain, % Total nitrogen, kg/ha
Black fallow
Fallowing to a depth of 25–27 cm Without fertilizers 2.37 12.74 2.24 125.80
N30 2.55 13.65 2.39 155.30
N30 + N30 2.59 13.92 2.44 163.70
Loosening to a depth of 10–12 cm Without fertilizers 2.24 12.61 2.21 110.90
N30 2.43 13.36 2.34 138.30
N30 + N30 2.50 13.80 2.42 132.50
Without autumn mechanical treatment Without fertilizers 2.47 12.10 2.12 129.40
N30 2.70 13.00 2.28 166.30
N30 + N30 2.79 13.12 2.30 179.10
Seed fallow
Fallowing to a depth of 25–27 cm Without fertilizers 1.48 11.84 2.07 45.30
N30 1.71 12.90 2.26 66.00
N30 + N30 1.86 13.58 2.38 82.40
Loosening to a depth of 10–12 cm Without fertilizers 1.43 11.91 2.08 42.50
N30 1.62 12.61 2.21 57.90
N30 + N30 1.73 13.14 2.31 69.00
Without autumn mechanical treatment Without fertilizers 1.84 11.34 1.99 67.30
N30 2.03 12.29 2.16 88.90
N30 + N30 2.25 12.78 2.24 113.40
Green fallow
Fallowing to a depth of 25–27 cm Without fertilizers 2.32 11.79 2.07 111.36
N30 2.43 12.44 2.18 128.50
N30 + N30 2.33 12.49 2.19 118.83
Loosening to a depth of 10–12 cm Without fertilizers 2.20 11.47 2.01 97.24
N30 2.38 11.89 2.09 118.30
N30 + N30 2.21 12.18 2.14 104.50
Without autumn mechanical treatment Without fertilizers 2.35 11.19 1.96 108.30
N30 2.54 11.83 2.07 133.60
N30 + N30 2.46 11.90 2.08 125.90

The dispersion analysis accompanied by calculation of NDS05 showed that all the results of the experiment are reliable.

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