Wild oat avena fatua competition with wheat triticum aestivum and triticum turgidum durum form nitrate

Henson, J.F.; Jordan, L.S.

Weed Science 30(3): 297-300


ISSN/ISBN: 0043-1745
Accession: 006918903

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Lath-house experiments were conducted to compare the effect of wild oat (A. fatua L.) competition on 2 wheat (T. aestivum L. Anza and T. turgidum durum group Mexicali) genotypes at 3 nitrate concentrations. Plants were grown to maturity in pots containing 10 wheat or wild oat plants, or mixtures of 10 wheat and 10, 25 or 50 wild oat plants. Nitrate was supplied in 500 ml Hoagland's solution with 1.5, 7.5 or 15.0 mM nitrate, as K and Ca nitrate, every 4 days. When grown without competition, Anza had more aboveground plant weight and grain yield and less whole-plant percent N than Mexicali. Wild oat competition caused larger reductions in plant weight and grain yield, and smaller reductions in percent nitrogen for Anza than for Mexicali. Wild oat competition reduced the effectiveness of nitrate in increasing plant weight, grain yield and whole-plant percent N of wheat.