A survey of mineral composition of weed seeds

avena avena sativa avenas avoine barley beta beta macrocarpa cebada cereales cereals chenopodium chenopodium murale cinc diplotaxis fer grain graine granos hierro hordeum hordeum vulgare iron malezas maroc marruecos mauvaise herbe morocco nitrogen content oats orge seeds semiarid zones semilla teneur en azote trigo triticum triticum aestivum triticum durum weeds wheats zinc