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Showing 2 results for Crop Rotation
Effect of Leaching on Reducing the Phytoxicity of Some Medicinal Plants on Wheat (Triticum aestivum)
Z. Alimohammadi, S. Fallah, Z. Adavi, M. Karimi,
Volume 9, Issue 4 (1-2020)
Abstract
The aim of this study was to investigate the effect of leaching on the reduction of soybean (Glycin max), black cumin (Nigella sativa), dill (Anethum graveolens) and dragonhead (Dracocephalum moldavica) residues allelopathy in wheat (Triticum aestivum) cropping. The experiment was conducted in a completely randomized design with three replications in 2017. The factors consisted of four types of previous plants (soybean, black cumin, dragonhead and dill) and three levels of leaching (without leaching, once leaching and twice leaching). The results showed that the previous plant type and leaching levels had no significant effect on wheat emergence. Leaching reduced the effects of deterioration of soybean, black cumin, dragonhead and dill. The highest rate of emergence was observed with 1.73 seedlings per day for wheat cultivated in soil with dill and dragonhead residues plus once leaching. The greatest root length (24.7 cm) was associated with wheat grown in soils with dragonhead residues plus once leaching. The highest leaf area and chlorophyll a and chlorophyll b content observed in the wheat grown in the soil with soybean residues plus once leaching. It was concluded that in agroecosystems where autumn wheat is in rotation, it is necessary to avoid wheat cultivation in the presence of soybean, black cumin, and dragonhead and dill residues and to reduce the inhibitory effects of these plants, one stage of leaching must be done before the cultivation of wheat.

The Effect of Crop Rotation, Mineral Fertilizer Application and Herbicide on Weed Control in Winter Rye
H Mohamad Dost Chamanabad, A Asghari,
Volume 13, Issue 47 (4-2009)
Abstract
The recent years' problems of herbicide use have led a growing number of researchers to seek alternative methods that are less reliant on herbicides. This research was conducted to determine the effect of long-term crop rotation, mineral fertilizer and herbicide on the weed infestation and grain yield of winter rye during 2004 and 2005 at the long-term experimental site of the University of Timiriazev, Moscow. Treatments were control (no weed control), herbicide, combined fertilizer (NPK) and NPK plus herbicide in field winter rye cultivated in continuous and crop rotation with other crops since 1912. Crop rotation significantly decreased weed density and dry mass. Long-term NPK application significantly decreased weed density, but had not any effect on weed dry mass. Crop rotation, NPK application and herbicide increased ground crop cover and decreased ground weed cover. In continuous crop, weed ground cover was 10 % in control plot and 3.33 % in plots where NPK was applied. Data showed that long-term crop rotation and NPK application can reduce weed infestation and increase grain yield of winter rye.
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