Effect of some soil herbicides on plant mineral nutrition and yield quality of the "Lyulin" primocane-fruiting rasrberry cultivar grown under drip irrigation
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Author: Rankova, Zarya; Koumanov, Kouman
The effect of napropamid, dichlobenil and oxyfluorofen on the mineral nutrition and the yield quality of the "Lyulin"primocane-fruiting cultivar was studied on the territory of the Fruitgrowing Institute in Plovdiv during the period 2005 - 2007. The experiment was carried out on alluvial-meadow soil (Fluvisol) under drip irrigation and, respectively, permanently high soil moisture in the row strip. Irrigation was scheduled according to the reference evapotranspiration (ETo) values estimated upon the readings of a "Class A"evaporation pan with a pan coefficient Kp=0.8. The following variants were set for evaluation: 1. Control ( untreated, non-weeded); 2. Napropamid - Devrinol 4 F - 400 ml/da; 3. Napropamid - Devrinol 4 F - 500 ml/da; 4. Dichlobgenil - Casoron 6,7 G - 6 kg/da; 5. Dichlobenil - Casoron 6,7 G - 7 kg/da; 6. Oxyfluorofen - Goal 2 E - 300 ml/da; 7. Oxyfluorofen - Goal 2 E - 400 ml/da. The application of the three soil herbicides did not affect negatively the yield and the fruit quality as well as the content of pigments and mineral nutrients in the leaves. The yield was descreased in the oxyfluorofen high-dose treatment only, while the fruit and the leaf chemical compositions were not negatively affected. Generally, the pigments and the mineral nutrients in the leaves, as well as the quality of the yield, tend to inclrease in herbicide treated plants.