EWRS 8th Symposium : Quantitative approaches in weed and herbicide research and their practical application

Published source details Glemnitz M. (1993) EWRS 8th Symposium : Quantitative approaches in weed and herbicide research and their practical application. Braunschweig, Germany, 14-16 June 1993, 697-704.
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This study is summarised as evidence for the following.

	Action	Category
	Reduce tillage Action Link

Reduce tillage

A controlled study in 1988-1990 in five plots in an arable field (Glemnitz 1993) found that weed cover was significantly higher in the conservation and minimum tillage regimes than under traditional tillage in most crops (no difference in corn and winter rye after corn). This study was presented at a conference in Germany, no location details were provided. The effect of reduced tillage on weed numbers and cover depended both on the current and previous crop in rotation. Conservation tillage led to higher weed numbers in winter rye after potatoes and in fodder radish (year 5), minimum tillage in winter rye after winter rye and both reduced tillage systems in winter rye after corn. Weed numbers in traditionally ploughed plots were higher in fodder radish (year 1). Tillage regime also affected weed community composition with some species being more dominant in traditional ploughing, others in reduced tillage systems. The following tillage regimes were used: traditional ploughing (18-30 cm deep), conservation tillage (combination of ploughing and non-ploughing, 10-15 cm) and minimum tillage (combination of ploughing and non-ploughing, 10-15 cm) on a crop rotation with five crops (potatoes, winter rye with catch crop, corn, winter rye, winter rye with catch crop). Plants were surveyed on 1 m² quadrats with 8-10 replicates/crop. Surveys were conducted two to three times yearly in 4 m² unsprayed plots. Number of plants, weed cover, crop cover and species composition (number and frequency of species) were recorded in crops (except potatoes) and catch crops.