Tag Archives: thermal weed control

425-429 J. Nadzeikienė, A.P. Sirvydas, R. Čingienė,R. Vasinauskienė and P. Kerpauskas
Plant protection by foam in the thermal control process
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Plant protection by foam in the thermal control process

J. Nadzeikienė, A.P. Sirvydas, R. Čingienė,R. Vasinauskienė and P. Kerpauskas

Lithuanian University of Agriculture, Kauno r. Studentu 15, LT 53356, Lithuania;tel: (+370) 37 75 23 17; e-mail: paulius.kerpauskas@lzuu.lt

Abstract:

During thermal weed control a high temperature medium exterminates weeds and culture plants without distinction. The problem of preserving germinating plants from thermal extermination therefore arises. Stable foam can be used to protect germinating agriculture plants from the thermal extermination. Using 100°C water steam for weed control for the sprouted carrot crop, till 40 days after the sowing, was investigated, and it was found that it is necessary to use preservatives. Extermination of carrots without preservatives depends upon the carrots’ development stage. It is advisable to use stable foam for plant protection from extermination, when biometric parameters of weeds and agricultural plants are similar. Sprouting agricultural plants covered with a stable foam layer are completely protected from thermal extermination, when 100°C water steam is sprayed at a distance of 8 cm to the plant. In the foam covered plant medium the temperature reached 39°C ± 4.2.

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359-366 P. Šniauka and A. Pocius
Thermal weed control in strawberry
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Thermal weed control in strawberry

P. Šniauka and A. Pocius

Lithuanian University of Agriculture, Studentų g. 11, LT-53361 Akademija,Kauno r., Lithuania; e-mail: Povilas.Sniauka@lzuu.lt

Abstract:

Weed control with herbicides is impossible in perennial organic agricultural systems. Alternatively, in these systems, weeds can be destroyed mechanically, thermally or by mulching with a plastic film, to minimize negative weed influence, but not to exterminate all of them. Thermal weed control requires knowledge of the plants’ thermal sensitivity. The most common weeds growing between strawberry rows in Lithuania are shepherd’s purse (Capsella bursa), common groundsel (Senecio vulgaris L.) and common chick-weed (Stellaria media). We have been researching thermal sensitivity of these weeds. Research has shown the results of preheating a 2-mm diameter weed stem up to 70oC: shepherd’s purse (Capsella bursa) 2.0 s., common groundsel (Senecio vulgaris L.) – 2.4 s. and common chick-weed (Stellaria media) 1.7 s. Weeds between rows were burned as mechanical control is not allowed when strawberries are flowering. To estimate the effectiveness of this method, when thermal weed sensitivity was researched, the unit speed was selected depending on the degree of weed development.

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221-225 P. Kerpauskas, A. P. Sirvydas,P. Lazauskas, R. Vasinauskiene and A. Tamosiunas
Possibilities of weed control by water steam
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Possibilities of weed control by water steam

P. Kerpauskas, A. P. Sirvydas,P. Lazauskas, R. Vasinauskiene and A. Tamosiunas

Lithuanian University of Agriculture, Department of Heat andBiotechnology engineering, Kauno r. Studentu 15, LT 53356, Lithuania;tel: (+370) 37 75 23 17; fax: (+370) 37 75 23 24; e-mail: paulius.kerpauskas@lzuu.lt

Abstract:

Damp water steam used for weed control in onion, barley and maize crops was investigated meaningfully for the first time in the world. These investigations show that damp water steam can be successfully used in organic and traditional agriculture for weed control. During weed control by steaming, up to 98% of weed shoots are destroyed. After two weed control treatments by damp water steam in an onion field, the crop yield increased up to 9−10%, compared with three times of weeding; in the maize crop 22%, in the barley crop 10%, compared with the not weeded control.

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451-455 R. Virbickaite, A. P. Sirvydas, P. Kerpauskas and R. Vasinauskiene
The comparison of thermal and mechanical systems of weed control
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The comparison of thermal and mechanical systems of weed control

R. Virbickaite, A. P. Sirvydas, P. Kerpauskas and R. Vasinauskiene

Lithuanian University of Agriculture, Department of Heat and BiotechnologyEngineering, Kauno r. Studentu 15, LT 53356, Lithuania; tel: (+370) 37 75 23 17;fax: (+370) 37 75 23 24; e-mail: v.rasaa@gmail.com

Abstract:

In ecological farming weed control after sowing time is pursued by mechanical, and recently, by thermal means. In thermal weed control both the surface of the soil and the roots of cultural plants remain undisturbed, however, the l cultured plant experiences a thermal shock. This combination of factors has a positive influence on productivity. Data for the comparable efficiency of thermal and mechanical weed control research results in 2001–2003 and 2005 are presented. 16 weeds were destroyed. Thermal weed control for annual weeds is 22.5% more effective in comparison with the mechanical method, however the latter is 32% more effective for perennial weeds.

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