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On a degraded chernozem (at the Experimental Farm Prusy near Cracow) in the years 1997- 2000 field experiments were carried out to determine the residual effects of different field bean types and field bean with undersown on winter wheat yields. The response of Polish cultivar "Sakwa" to sowing at a recommended date or 4 weeks later was tested. Late planting resulted in a significant reduction...
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