The aim of the research carried out in 2009-2010 was to assess the yield of selected spring wheat cultivars grown in the organic system at two levels of agricultural practices. Applied practices differed in fertilization and intensity of harrowing. The study was conducted in the organic farm of IUNG-PIB in Grabów (Masovian voivodeship). The scope of analysis included the determination of grain yield and characteristics of its structure as well as number and dry matter of weeds. Spring wheat in the object with intensive agricultural practices yielded higher compared with one-harrowing object, depending on the year by 9-14%. This was achieved through better yield structure parameters, especially the density of ears. The studies found no clear effect of applied agricultural measures on weed infestation of spring wheat.
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