Tolerance of corn, sorghum, sorghum-sudangrass hybrid, and pearl millet to simazine and alachlor.
1989
Lee S.S. | Choi S.J.
In 1988 the tolerance of corn, sorghum, sorghum-sudangrass, and pearl millet hybrids to simazine and alachlor was tested in field during the growing season and pots during the summer and fall. In field and summer pot experiments (Exp.) the above mentioned four crops were tested at the ratios of simazine WP (50 % ai, g/10a) : alachlor EC (43.7 % ai, ml/10a) of 130 : 0, 100 : 0, 70 : 200, 0 : 300 and 0 : 400 and a sorghum hybrid was tested at 0, 50, 100, 200, 300 and 400ml/10a of alachlor and 70g/10a of simazine + 200ml/10a of alachlor in fall pot Exp. In corn emergence rate, percent stand, plant height of seedlings, and dry matter (DM) yield were not affected by simazine and alachlor in all Exps. In sorghum and sorghum-sudangrass early growth and DM yield were not affected by simazine and alachlor in field Exp. In contrast, simazine reduced height and dry weight of seedlings slightly without any detrimental effects on emergence and survival rates, but alachlor reduced survival rate, plant height, and dry weight of seedlings significantly in summer pot Exp. In fall Exp. alachlor did not affect emergence rate of a sorghum hybrid, but survival rate, plant height, and dry weight of seedlings reduced with increased levels of alachlor when applied higher than 100ml/10a. In pearl millet simazine did not affect emergence rate, plant height, and DM yield in field, but reduced survival rate, plant height, and dry weight of seedlings reduced with increased levels of alachlor when applied higher than 100ml/10a. In pearl millet simazine did not affect emergence rate, plant height, and DM yield in field, but reduced survival rate, plant height, and dry weight of seedlings in summer pot Exp. However, alachlor reduced DM yield significantly due to a lower percent stand even in the field. In summer pot Exp. although emergence rate was slightly reduced, all seedlings were dead after emergence. Simazine did not control grasses such as Digitaria sanguinalis, Setaria viridis, Echinochloa crusgalli effectively, but controlled broadleaf weeds.
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