In the years 1999–2001 an attempt was made to reclaim a plot of land near Wrocław, lying fallow for a long time. The studies compared the effects of two variants of soil moisture and five variants of fertilisation on plant yields and the productivity of fertiliser compounds and water from sprinkling irrigation. The fresh matter yields of plants grown in rotation: turnip – spring barley – serradella were found to depend on the water--fertiliser variant and to vary in the ranges: turnip (roots) – 8.1–51.0 t · ha-1, spring barley (grain) – 1.11–2.95 t · ha-1, serradella (green matter) –3.12–12.44 t · ha-1. The results indicate that the best production effects were usually achieved under sprinkling irrigation (adjusted so as to cover water deficits) and fertilisation with farmyard manure or farmyard manure combined with NPK. Covering the water deficits in the vegetation season contributed to the satisfactory yielding of plants on the soil formerly lying fallow. Sprinkling irrigation had also a part in adjusting the amount and stability of yields of the plants in rotation, and made it possible to cultivate spring barley in atypical soil conditions.

101-109