Browsing by Author "Tursun, Nihat"
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Publication Efficiency and cost-effectiveness of weed flaming in orchards(Bursa Uludağ Üniversitesi, 2021-08-23) Tursun, Nihat; Arslan, Selçuk; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Biyosistem Mühendisliği BölümüThe objective of this study was to determine the response and cost of weed flaming in different fruit orchards. Six different propane doses (15, 30, 45, 60, 75 and 90 kg ha-¹) were applied to determine the response of 6 dicotyledon and 3 monocotyledon weed species toflaming in apricot, walnut, and mixed fruit orchard. Dose-response relationships were determined using log-logistic model for 50%, 80%, and 90% control rates at 1, 7 and 14 days after treatment (DAT) at 2–4, 6–8 and 10–12 leaf (L) growth stages. Flaming at early stage of weed growth (2–4 L) resulted in 90% control of all dicotyledon weeds at 14 DAT with propane doses ranging from 35.0 to 65.8kg ha-¹, while this range was from 28.6 to 54.9 kg ha-¹ at 80%, suggesting approximately 15–20% less propane use for 80% weed control compared to 90% control. Monocotyledon weeds were resistant to thermal stress even at 2–4 L stage and could be controlled at 14 DAT with propane dose from 125.7 to 210.9 kg ha-¹ at 90% control rate and 74.6 to 133.4 kg ha-¹ at 80% control rate. The cost of weedflaming was compared to the spraying application using partial budgeting method. Flaming costs (30.6 and 34.4 $ ha-¹) for dicotyledonweeds at 80% and 90% weed control rates were comparable to herbicide application at 2-4 L stage, whereas flaming was found costly than chemical spraying at other growth stages for any weed species.Publication The performance of specially-built gas nozzles for thermal weed control(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2019-01-01) Tursun, Nihat; Arslan, Selçuk; ARSLAN, SELÇUK; Turaloğlu, Çağdas; Bursa Uludağ Üniversitesi/Ziraat Fakültesi; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Biyosistem Mühendisliği.; 0000-0002-8765-0326; AID-5028-2022; R-8043-2016The aim of this study was to develop a gas nozzle that can be used more appropriately in flame weeding compared to commercial ones. For this purpose, three different types of nozzles were built, tested at gas pressures of 1.0-3.0 bar, and flowrate-pressure characteristics were determined using gravimetric method. Among the gas nozzles built, 3-hole 1 mm diameter nozzle (Type1) was found to be appropriate to provide targeted LPG gas doses of 40-130 kg ha(-1) at a pressure range of 1.5-2.5 bar. This nozzle decreased the high ground speeds for low gas doses that had to be applied using the commercial gas nozzle, and increased the low ground speeds for high gas doses. As a result, the required ground speed range of 1.8-8.1 km h(-1) for the commercial nozzle was improved to 3.5-6.5 km h(-1) at an operating gas pressure of 2.0 bar. Field capacity can be increased using the specially-built nozzle since ground speeds were increased at high doses. Also, the exposure time of weeds to heat was increased about 20% at low doses, potentially increasing the flaming efficiency. Due to small hole diameters, Type2 and Type3 were not appropriate for tractor-mounted flame weeders. It was concluded that the result of the study to develop specially-built gas nozzle (Type1) as an alternative to commercial ones was positive.