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Wplyw wieloletnich uproszczen uprawy roli na liczbe i rozmieszczenie nasion chwastow w glebie

100%

Witkowski F.

1998

tom 45

nr 1

31-40

The analysis includes the comparison of four multi-annual experiment results, where some features of weed seeds accumulated in soil were studied depending on various methods of soil cultivation, a traditional ploughing and simplified ones: direct drilling, rotary tillage at 10 cm depth, ploughing at 15 cm. The number of weed seeds in the ploughed layer in particular experiments ranged from 8.8 thousand to 70 thousand per 1 m2. Most seeds were found in the oldest experimental fields with less chemical weed control. The simplified cultivation led to increase in the number of seeds by about 50% or 100%. The reason for this was the accumulation of seeds in the surface layers and good storage of great seed quantities formerly accumulated in the undisturbed soil layers. The seeds remained for many years in the untouched layers sprouted similarly to those in the cultivated layers.

Temporal partitioning of diurnal behavioural patterns of Coris julis and Diplodus vulgaris (Actinopterygii: Perciformes) in Mediterranean coralligenous habitats

51%

Witkowski F. , Vion A. , Bouchoucha M.

nr 3

Wplyw roznych sposobow uprawy scierniska na zachwaszczenie pola

51%

Witkowski F. , Roszak W. , Radecki A.

nr 3-4

141-151