Non-chemical weed control systems in organically grown spring oilseed rape

This study aims to determine the impact of different non-chemical weed control systems on organically grown spring oilseed rape (Brassica napus L.) crop weediness and yield of seeds. Non-chemical weed control systems: 1) thermal (water steam), 2) mechanical (inter-row loosening), and 3) smothering (self-regulation). Thermal (1.5–1.8 times) and mechanical (2.5–6.8 times) weed control systems significantly reduced the number of weed seedlings in spring oilseed rape crop, compared with the weed smothering system. The most effective system of weed control in rape crop was mechanical (efficiency 30.9–75.5 %). Efficiency of thermal weed control system, compared with mechanical, was lower, 28.4–40.0 %. Before rape harvesting in plots where mechanical weed control was applied, compared with plots where weed smothering was used, the number of weeds was significantly 3.2–4.4 times lower, and dry matter mass of weeds was 2.2–3.1 times lower. The yield of rape seeds increased with increasing efficiency of thermal and mechanical weed control. In 2014, the yield of rape seeds depended on number of weed seedlings and dry matter mass of weeds before rape harvesting.Keywords: spring oilseed rape, weed control systems, weed, yield, organic farmin

Testing the quality of spraying fluid by using various nozzles in special devices Lechler Dropleg UL

eISSN 2345-0916; eISBN 9786094491283A variety of devices that help to prevent drops of spayed pesticides from getting into places that are difficult to reach (e. g. under the leaves of cultural plants of on the stem), is offered. Special devices Lechler DroplegUL are designed in a way that nozzles that are embedded in the end of the spraying pipe which is bended backwards, spray diagonally upwards. Data of the quality of spraying fluid by using various sprinklers in special devices Lechler DroplegUL is provided in the article. Two hydraulic flood nozzles Lechler 684.356.30X, mounted in a special holder TwinSprayCap were examined: pneumohydraulic twin flat spray air-injector nozzle Lechler DF 120-03 and hydraulic twin flat spray nozzle Lechler DF 120-02. A transverse repartition and a process of the formation of fluid drops, sprayed using different nozzles were examined. The results revealed that while spraying with a lower working pressure (e.g. 1.5 bar) with two hydraulic flood nozzles Lechler 684.356.30X that are placed in a special holder TwinSprayCap and embedded on a device Lechler DroplegUL, a majority of drops (evenly around 40 ml) get into stand trays that are in a setting place situated 70–110 cm behind the device Lechler DroplegUL, whereas at the approximate 40 cm area away from the setting place there are no drops of sprayed fluid at all. Having the working pressure increased to 3–4 bar, majority of drops (around 60 ml) get into the stend trays that are in a setting place situated 70–110 cm behind the device Lechler DroplegUL. Having the working pressure increased, an unsprayed area, which is situated around the setting place of the device Lechler DroplegUL, gets narrowed: a width of unsprayed area when spraying at the pressure of 2 bar was around 60 cm, whereas when the pressure was 3 bar and 4 bar, the area appeared to be only 20 cm. [...]Vytauto Didžiojo universitetasŽemės ūkio akademij

Testing the Quality of Spraying Fluid by Using Various Nozzles in Special Devices Lechler Droplegul

Puslapių numeracija pagal pataisytą leidinįA variety of devices that help to prevent drops of spayed pesticides from getting into places that are difficult to reach (e. g. under the leaves of cultural plants of on the stem), is offered. Special devices Lechler DroplegUL are designed in a way that nozzles that are embedded in the end of the spraying pipe which is bended backwards, spray diagonally upwards. Data of the quality of spraying fluid by using various sprinklers in special devices Lechler DroplegUL is provided in the article. Two hydraulic flood nozzles Lechler 684.356.30X, mounted in a special holder TwinSprayCap were examined: pneumohydraulic twin flat spray air-injector nozzle Lechler DF 120-03 and hydraulic twin flat spray nozzle Lechler DF 120-02. A transverse repartition and a process of the formation of fluid drops, sprayed using different nozzles were examined. The results revealed that while spraying with a lower working pressure (e.g. 1.5 bar) with two hydraulic flood nozzles Lechler 684.356.30X that are placed in a special holder TwinSprayCap and embedded on a device Lechler DroplegUL, a majority of drops (evenly around 40 ml) get into stand trays that are in a setting place situated 70 – 110 cm behind the device Lechler DroplegUL, whereas at the approximate 40 cm area away from the setting place there are no drops of sprayed fluid at all.Having the working pressure increased to 3 – 4 bar, majority of drops (around 60 ml) get into the stend trays that are in a setting place situated 70 – 110 cm behind the device Lechler DroplegUL. Having the working pressure increased, an unsprayed area, which is situated around the setting place of the device Lechler DroplegUL, gets narrowed: a width of unsprayed area when spraying at the pressure of 2 bar was around 60 cm, whereas when the pressure was 3 bar and 4 bar, the area appeared to be only 20 cm.[...]Vytauto Didžiojo universitetasŽemės ūkio akademij

Garo srauto temperatūros kitimas profiliuotame dirvos paviršiuje

Vytauto Didžiojo universitetasŽemės ūkio akademij

Dirvos profiliavimas sėjos metu

Vytauto Didžiojo universitetasŽemės ūkio akademij

Influence of water steam on carrots field

Vytauto Didžiojo universitetasŽemės ūkio akademij

Dewy water steam scatter in profiled soil surface

Vytauto Didžiojo universitetasŽemės ūkio akademij

Weed diversity and density response to crop management practices in spring barley

Vytauto Didžiojo universitetasŽemės ūkio akademij

Temperature changes in the soil surface in the process of thermal weed control

In the thermal weed process high temperature media heats not only plants to be thermally damaged, but the soil surface as well. The possibilities of thermal damage of the sprouting agricultural plants, seeds and shoots in the soil surface layer are analyzed in the article. It's investigated, that using hot water steam the soil surface layer is heated. Weed shoots in up to 1.1 mm depth can be destracted when thermal effect lasts 1-2 sec. Using burning gas for thermal effect, the twice longer time-exposure doesn't affect weed seeds in the surface soil layerVytauto Didžiojo universitetasŽemės ūkio akademij

Terminio piktžolių naikinimo karštomis dujomis poveikis dirvai

Vytauto Didžiojo universitetasŽemės ūkio akademij