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Investigation of soil tillage practices and weed control methods on Zea may farms in North West of Iran


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Abstract

In order to study the influence of tillage methods on weed control in corn (single cross 704), an experiment was conducted in Miandoab research station for 3 years from 2014- 2017.The design of experiment was spilt plot based on random block designed. Main factor was two tillage method with chisel and mould board plow in 25 cm depth and weed control methods as sub factor in 4 level were: chemical control with using of 2 L /ha (Cruz) Nicosulfuron (4% S.C), mechanical control with 2 times cultivation between rows in 2 and 8 leaves stage of corn, control treatment without weeds (with 3- hand weeding) and control treatment with weeds. Analysis of variance results indicated that the effect of tillage methods on corn yield was not significant. Average of corn yield in different tillage methods were 9.422 and 9.148 respectively but the effect of control methods was significant at 1%level.Means comparison by Duncans multiple range test showed that chemical control and hand weeding respectively with 11.285 and 10.85 were placed in a same group but mechanical control and without control respectively with 8.654 and 6.357 were placed in another groups. Analysis of variance results indicated that the effect of Tillage methods on density of common purslane and barnyard grass was significant at 1%level but on the other weeds, tillage method didn't show any effect on their density. Average of density of barnyard grass during 3 years with mould board plow and chisel were43/083, 12 respectively and average of density of common purslane with mould board plow and chisel were6/917 and 14/5 respectively and they were placed in separated group by using of Duncans multiple range test.

Main weeds of experiment were:
I.    Red root pigweed (Amaranthus retroflexus)
II.    Lambsquarters (Chenopodium album)
III.    Common purslane (Portulaca oleraceae)
IV.    Barnyard grass (Echinochloa crus-galli)
V.    Field bindweed (Convolvulus arvensis)

Keywords

red root pigweed, Amaranthus retroflexus, Chenopodium album, Portulaca oleraceae, Echinochloa crus-galli, Convolvulus arvensis, alternative plants, soil, cop yield, germ

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