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The effect of harrowing on the weediness and yield of spring barley in organic farming
2005
Svarta, A.(Latvia Univ. of Agriculture, Skriveri, Aizkraukle reg. (Latvia). Agency Research Institute of Agriculture)E-mail:svarta@inbox.lv
Field trials were carried out on organic farming fields at the Research Institute of Agriculture of the Latvia University of Agriculture (LLU). The influence of harrowing (without harrowing, before emergence, at the stage of tillering, before emergence and at the stage of tillering) depending of pre-crop (red clover, winter rye for grain, bare fallow and green manure) and use of stable manure (60 t haE-1 or without) on the weediness and yield of spring barley 'Sencis' was tested during 2003-2004. In spring barley, 18 species of weeds were established at the stage of earing during 2003-2004. The most widespread of perennial weeds were Elytrigia repens (L.) Nevski and Sonchus arvense L. The dominant annual weeds were Chenopodium album L., Stellaria media L., Capsella bursa-pastoris L., Polygonum spp., and Matricaria inodorum L. The number of annual weeds at the stage of earing differed during the years 50-160 (in 2003) and 33-118 (in 2004) annual weeds per mE-2. The influence of harrowing on the number of annual weeds was different during the testing years. The influence of harrowing on the grain yield was negligible during 2003 and 2004.
Показать больше [+] Меньше [-]Weed infestation and control in spring barley
2002
Vanaga, I. (Latvia Univ. of Agriculture, Jelgava (Latvia))
Weed surveys showed that annual broad-leaved weeds were dominant in spring barley sowings in central Latvia. Field trials on broad-leaved weed control in spring barley showed that herbicides Granstar and Duplosan Super at 0,5 and 0,25 doses gave good weed control. There were statistically significant relationships between the abundance of broad-leaved weed and the yield of spring barley when barley yield and broad-leaved weed population were both high.
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