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In average of six trials four sprayings have controlled all weed and maximum yield is achieved. Tractor pulled hoeing in combination with four sprayings show a tendency to yield reduction until 3 percent. Hoeing has increased yield when weed is present where only one, two or three sprayings has been executed. In two trials one spraying has been sufficient to control the weed, but those trials are not representative.
Based on the present and earlier trial results a model to describe the relation between weed cover and relative sugar yield has been developed. The trial results show if more than 2 percent of the soil surface is covered by weed after maximum efficacy on weed is reached after finalised weed control or 2 percent of the canopy is covered by weed in august yield losses is likely to occur. This is an adaptation of previous thresholds.
The fourth spraying may be substituted by one or two mechanical hoeing’s still achieving maximum yield. This will reduce the Danish treatment index by 28 percent in the present trials. Further reduction may be achieved by using band spraying in combination with mechanical hoeing.
Trials in 2014 show a weak tendency to advantage of Spray Plus in humid conditions when almost moist occur on the leafs in the spraying situation. There is a tendency that improved coverage of the spray fan – nozzle F02-110 Hardi – on the weed leafs is more important in dry conditions while no difference is obtained in moist conditions.
Trials in 2016 and 2017 show mixing of the oil Renol S increase efficacy compared to none additive in the tankmix. Minidrift 02-110 Hardi nozzle show a tendence to reducere efficacy of the herbicides more than Low Drift 02-110 Hardi Nozzle that also reduce efficacy compared to flat fan Hardi nozzle 02-110. In this is an environmental conflict and compensating for an exchange to lowdrift or minidrift may demand an increase in dosage.
Increased supply of nitrogen will in general not replace a part of the herbicide dosage as an alternative. This corresponds to earlier trials indicating beets having a low ability to compete with the weed.
The general trend was a decreasing sowing quality with increased drilling speed. This affected in variable degree plant emergence, yield and harvest losses.