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Type of publication: Straipsnis recenzuojamoje Lietuvos tarptautinės konferencijos medžiagoje / Article in peer-reviewed Lithuanian international conference proceedings (P1e)
Field of Science: Mechanikos inžinerija / Mechanical Engineering (T009)
Author(s): Kazakevičius, Vytautas
Title: Results of weed control investigations in ripenning corn and stubble
Is part of: Proceedings of the international conference. , No. 12 (2007)
Extent: p. 49-53
Date: 2007
Abstract: Proceeding to the minimal technologies while cultivating the soil, removing of weeds in crop and stubble gets more and more important. Weeds are removed by contact herbicide at the end of crop vegetation (when 2 weeks until harvest are left) and after harvest when fine-cut straw is spread on the stubble. Nevertheless, when herbicides are sprayed on dense crop, as it can be seen from practice and literature information [1], 48 % of preparation solution fall on crop ears and only 10–16 % of it fall on lower sections where weeds grow. The surface of stubble with a lot of remains of plants reduces the affect of herbicides on weeds. While removing weeds by way of contact it is necessary to cover them all over with tiny drops of preparation solution of herbicides, and if the covering is insufficient, the conditions occur for growing side offsets [2]. During the crop vegetation leaves of some levels grow, and the area of the sprayed surface changes. By the end of crop vegetation leaves fold, and the area of the sprayed surface becomes larger by 2.5 times [2]. In order to reach weeds, drops of contact herbicides have to permeate on dense crop. Spraying in dense crop takes new technological means, so considerable requirements for the used spraying machinery are put: a) high and stable enough pressure during the process of spraying; b) increased permeability of the flow of sprayed drops; c) choosing of suitable nozzles. Considerable influence for herbicide losses is observed when drops of herbicides are carried away downwind while dense crop is being sprayed and chemical preparations land on already sprayed crop areas or on nearby fields [3, 4]. That is why removing of weed in dense crop and stubble is the problem of herbicide spraying that does not meet soil and environment protection requirements at the moment. The purpose of the research is: to evaluate herbicide spraying efficiency removing weeds in ripening corn and stubble
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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