Effect of multi-year differentiated fertilization on the weed infestation of spring barley and winter wheat in crop rotation
Jaskulska, I.(Akademia Techniczno-Rolnicza, Bydgoszcz (Poland). Katedra Podstaw Produkcji Roslinnej i Doswiadczalnictwa)E-mail:[email protected]
The aim of the present studies carried out over 1994-98 was to define the effect of multi-year fertilization with straw + NPK, NPK only, manure only, manure with: PK, NK, NP, NPK, NPK + Ca and no fertilization on the weed infestation of cereals cultivated in crop rotation. The weed infestation was evaluated in a static fertilization experiment established in 1948 at Mochelek in the vicinity of Bydgoszcz (Poland) on typical lessive soil, of very good rye complex. Weeds dominating in spring barley included Spergula arvensis and Chenopodium album, and in winter wheat Viola arvensis and Apera spicaventi. The lowest amount of air-dry matter of weeds in spring barley was observed for multi-year fertilization with manure and with NPK + Ca and with no fertilization. In winter wheat, however, low weed infestation was also recorded for fertilization with manure only and with manure + PK
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