The frequency distribution of yield loss due to weeds in winter wheat, sugar beet, maize and soybean has been studied using the available data of weed control trials undertaken in north-central Italy in the last 30 years. The breakeven yield loss and the probability of obtaining a positive net return from chemical weed control were calculated, considering different treatment options and different weed-free yields. The mean value of yield loss varies from 23 to 30% in winter wheat and from 33.9 to 37.5% in maize, depending on the type of weed flora, and is 50.2% for sugar beet and 33.3% for soybean. The breakeven yield loss falls between 1.4 and 15% in winter wheat, 4.0 and 12.2% in maize, 5.1 and 12.6% in sugar beet and 3.3 and 17.7% in soybean. Even with the higher treatment costs and the lower yields, the probability of a positive net return is always > 80% and, for sugar beet, > 95%.
ECONOMICS OF HERBICIDE USE ON ARABLE CROPS IN NORTH-CENTRAL ITALY
ZANIN, GIUSEPPE;BERTI, ANTONIO;
1992
Abstract
The frequency distribution of yield loss due to weeds in winter wheat, sugar beet, maize and soybean has been studied using the available data of weed control trials undertaken in north-central Italy in the last 30 years. The breakeven yield loss and the probability of obtaining a positive net return from chemical weed control were calculated, considering different treatment options and different weed-free yields. The mean value of yield loss varies from 23 to 30% in winter wheat and from 33.9 to 37.5% in maize, depending on the type of weed flora, and is 50.2% for sugar beet and 33.3% for soybean. The breakeven yield loss falls between 1.4 and 15% in winter wheat, 4.0 and 12.2% in maize, 5.1 and 12.6% in sugar beet and 3.3 and 17.7% in soybean. Even with the higher treatment costs and the lower yields, the probability of a positive net return is always > 80% and, for sugar beet, > 95%.Pubblicazioni consigliate
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