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Herbicide Effects on Maturity of Spring Barley in Alaska
Author(s) -
Conn J. S.
Publication year - 1990
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1990.0011183x003000020002x
Subject(s) - metribuzin , dicamba , bromoxynil , mcpa , hordeum vulgare , biology , weed control , zoology , horticulture , mecoprop , clopyralid , agronomy , poaceae
Growing season length is marginal for spring barley ( Hordeum vulgare L.) production in Alaska. A study was conducted at Fairbanks, AK from 1983 through 1987 to determine whether herbicides commonly used for broadleaf weed control in barley could increase time to reach physiological maturity (PM) and time to reach kernel moisture contents (KM) of 200 g H 2 O kg −1 (KM 20 ) and 140 g H 2 O kg −1 (KM 14 ). The herbicides applied were: 2, 4‐D [(2,4‐dichlorophenoxy) acetic acid], MCPA [(4‐Chloro‐2‐methyl‐phenoxy) acetic acid], bromoxynil (3, 5‐Dibromo‐4‐hydroxybenzonitrile), chlorsulfuron [2‐chloro‐N‐[[(4‐methoxy‐6‐methyl‐l,3,5‐triazin‐2‐yl) amino] carbonyl] bezenesulfonamide], dicamba (2‐Methoxy 3,6‐dichloro dichcorobenzoic acid), dinoseb [2 (see‐but) l)‐4,6‐dinitrophenol], and metribuzin [4‐Amino‐6‐(l,l‐dimethylethyl)‐3‐(methyIthio)‐l,2,4‐triazin‐5 (4 H )‐one]. Each herbicide was applied at 0.5,1, and 2 times the rate recommended for barley. Metribuzin was also applied at a 4✕ rate. The herbicides did not influence the amount of time required to reach PM. Metribuzin applied at 1.0 kg ha −1 increased the time to KM 20 and KM 14 in 1983, 1984, and 1985 by an average of 5 d. Metribuzin applied at 0.5 kg ha −1 in 1984 increased the time to reach KM 20 by 7 d and to KM 14 by 8 d relative to the untreated control. Dinoseb at 1.1 kg ha −1 in 1984 and 1985 increased time to KM 20 by 21 and 4 d and to KM 14 by 24 and 5 d, respectively. Dinoseb at 0.6 kg ha −1 delayed arrival at KM 20 and KM 14 by 8 d in 1984. Five of the herbicides (MCPA, 2,4‐D, bromoxynil, dicamba, and chlorsulfuron) had no effect on barley maturity in any of the five years. Dinoseb has been withdrawn from the market. Metribuzin should be applied only at recommended rates with minimal spray overlaps to avoid delays in maturity.