Effects of different winter cover crops and their residues on weed control and cotton (Gossipiom hirsutum) yield (Golestan cultivar)

Document Type : Research Paper

Authors

1 MSc of Weed Science, Agronomy Department, Plant Production Faculty, Gorgan University of Agricultural Sciences and Natural Resources, Iran

2 Assistant Professor, Agronomy Department, Plant Production Faculty, Gorgan University of Agricultural Sciences and Natural Resources, Iran

3 Associate Professor . Agronomy Department, Plant Production Faculty, Gorgan University of Agricultural Sciences and Natural Resources, Iran

4 Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

Abstract

To investigate the effect of winter cover crops on weed dynamics, growth and yield of Cotton Var. Golestan, an experiment was conducted in 2017-2018 at research farm of Gorgan University of Agricultural Sciences and Natural Resources as split-block with three replicates. Treatments included cover crops at seven levels of barley, rye, hairy vetch, Indian mustard, arugula, clover and cover crop-free control under weeding and non-weeding conditions. Leaf area index and dry weight of cotton decreased significantly under non-weeding conditions, The results indicated that lack of weed control led to decrease in bolls per plant, boll weight and lint yield. The highest and lowest lint yiled was observed in hairy vetch with 5035 Kg.ha-1 and barley and arugula treatments with 2261 and 2403 Kg.ha-1, respectively. The highest lint yield in weeding conditions was observed in the treatment of hairy vetch with 5035 Kg.ha-1, which was not significantly different from the berseem clover treatment. The lowest lint yield in weeding conditions was obtained in barley and arugula cover crops treatments with 2261 and 2403 kg.ha-1, respectively. Due to the proper control of weeds in these treatments, it seems that the occurrence of allelopathic effects due to the decomposition of the residues of these two plants on cotton has been the cause of this reduction. According to the results, sowing cotton in hairy vetch and berseem clover residues and a supplementary management strategy such as weeding or application of herbicides at reduced rates is recommended for effective weed control.

Keywords

References

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