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Soybean weed control by chloramben granules coated with haloxyfop‐methyl
Author(s) -
DALE J. E.
Publication year - 1985
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1985.tb00639.x
Subject(s) - abutilon , chemistry , calcareous , horticulture , weed , sesbania , agronomy , oryza sativa , botany , biology , biochemistry , gene
Summary Experimental granules were made from moistened calcareous loess (pH 8·5) containing 2% w/w gum xanthan and chloramben sodium salt at w/w concentrations of 0·4–3·6%. Haloxyfopmethyl * (DOWCO‐453 ME) {Methyl 2‐(4‐((3‐chloro‐5‐(trifluoromethyl)‐2‐pyridinyl)oxy)‐phenoxy)propanoate) was dissolved in tung oil at a range of concentrations and poured on the dried chloramben granules with stirring. In the glasshouse, dry granules containing chloramben plus haloxyfop‐methyl spread pre‐emergence at the rate of 0·8 + 0·4 kg ha −1 reduced the dry weight of maize (Zea mays L.), red rice (Oryza sativa L.), Abutilon theophrasti Medic., and Sesbania exaltata (Raf.) Cory by 89, 100, 94, and 68%, respectively, with no injury to soybeans [Glycine max (L.) Merr.]. Coated granules spread pre‐emergence controlled A. theophrasti and volunteer maize grown from seed sown in soil up to 10 cm deep. In a preliminary field test, the experimental granules reduced numbers of weeds in soybeans and improved crop yield. Ten weeks after treatment, chloramben granules coated with haloxyfop‐methyl gave 97% control of Sorghum halepense (L.) Pers compared to 80% by uncoated granules. Linuron granules coated with haloxyfop‐methyl gave 85% control compared to 12% by uncoated granules. Yields in plots treated with coated and uncoated chloramben were 3280 and 2700 kg ha −1 , respectively. In coated and uncoated linuron plots, yields were 2920 and 2340 kg ha −1 , respectively. Except for the uncoated linuron plot, all yields were significantly higher than 2050 kg ha −1 obtained in the weedy untreated plot.