The effect of soil tillage, sowing technology and herbicide application on weed infestation in spring barley
Lapins, D.(Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Dept. of Soil Management)E-mail:[email protected] | Berzins, A.(Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Dept. of Soil Management) | Kopmanis, J.(Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Dept. of Soil Management) | Sanzarevska, R.(Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Dept. of Soil Management)
Field trials were carried out at the Research and Study farm (RSF) "Vecauce" of the Latvia University of Agriculture (LLU) during 2002-2003. The effect of soil deep loosening, sowing technology and weed control on the yield of spring barley was studied on sod podzolic (2002) and sod carbonate leached (2003) loam soils with humus content 14 g kgE-1 (2002) and 20 g kgE-1 (2003), soil reaction pHKCl 6.0 and 6.6, content of phosphorus 204 and 207 mg kgE-1, content of potassium 96 and 105 mg kgE-1, respectively. Spring barley was grown in recurrent sowing. Following treatments were investigated in the trial: Factor A - usage of herbicide Glifoss in autumn in treatments with direct sowing (done before the trial year): A1 - without Glifoss (untreated); A2 - Glifoss 0.5 L ha-1; A3 - Glifoss 2.0 L ha-1; A4 - soil ploughing at the depth of 18-22 cm; Factor B - sowing technologies: B1 - using a disc driller and local deposition of mineral fertilizers (except ammonium fertilizers) ("Rapid 400 C", hereafter "Rapid"); B2 - using an anchor-type driller with a rotortiller at the depth of 5-7 cm and dispersion of mineral fertilizers before sowing ("Amazone AD-403 super", hereafter "Amazone h1"); B3 - using anchor-type driller with rotortiller in depth 7-10 cm and dispersion of mineral fertilizers before sowing ("Amazone AD-403 super", hereafter "Amazone h2"). Diverse meteorological conditions in the trial years had determinative importance to the effect of soil tillage, application of Glifoss and sowing technologies on weed infestation in sowings and growth and development of spring barley. Significant decrease in the number of annual weeds was observed by increasing the depth of the rotortiller from 5-7 cm to 7-10 cm using sowing machine "Amazone AD-403 super". A significant negative effect on the growth and development of spring barley was caused by increased number of Elytrigia repens (L.) Desv. ex Nevski. The negative effect of sowing infestation with annual weeds on the growth and development of spring barley was not significant.
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