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Abstract

The yield of many crops can be increased by irrigating them with magnetically treated water (MTW). The aim of our research was to determine if the efficacy of a soil-applied herbicide such as metribuzin against weeds could be affected by MTW. A split-plot randomized complete block experiment was designed with two main plots, including potato ( Solanum tuberosum L.) irrigated with equal volumes of MTW and non-MTW. Sub-plots were weedy control, weed-free control (hand-weeded), and pre-emergence application of metribuzin at 420 and 525 g a.i. · ha–1. Generally, MTW induced the seed germination and vegetative growth of Amaranthus blitoides S.Watson and Convolvulus arvensis L., resulting in a reduction of the total tuber yield of potato from 1.47 to 1.18 kg · m–2. MTW improved the efficacy of weed control strategies, resulting in an improvement of the total tuber yield and the water use efficiency of potato. The total tuber yield when metribuzin was applied at 420 g a.i. · ha–1 with MTW (3.51 kg · m–2) was more than when metribuzin was applied at 525 g a.i. · ha–1 with non-MTW (2.76 kg · m–2). It can be concluded that the use of MTW can be a safer crop production method by reducing the required dosage of metribuzin to control weeds. Considering the fact that the use of MTW without herbicide application increased the density of weed species, this method should be limited to a scenario where weeds can be effectively controlled.
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Authors and Affiliations

Akbar Aliverdi
1
ORCID: ORCID

  1. Department of Agronomy and Plant Breeding, Bu-Ali Sina University, Hamedan, Iran
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Abstract

It is challenging to obtain proper leaf wetting. An angled spray could overcome this impediment, but which spray angle is best suited to droplet size is still unknown. In an outdoor pot experiment, seven doses of cycloxydim and sethoxydim were sprayed with single-orifice standard, anti-drift, and air induction (having a fine, medium, and extremely coarse spray quality, respectively) flat fan nozzles, using spray angles of 10°, 20° backward, 0° (vertical), 10°, 20°, 30°, 40°, 50°, and 60° forward relative to the direction of nozzle trajectory on wild barley at the three-leaf stage. Generally, the forward angled spray was better than the backward angled spray. With a standard flat fan nozzle, the forward angling of spray from 0° to 20° reduced the ED50 from 60.24 to 39.85 g a.i. ⋅ ha−1 for cycloxydim and from 150.51 to 81.13 g a.i. ⋅ ha−1 for sethoxydim. With an anti-drift flat fan nozzle, the forward angling of spray from 0° to 30° reduced the ED50 from 72.57 to 50.20 g a.i. ⋅ ha−1 for cycloxydim and from 181.94 to 104.51 g a.i. ⋅ ha−1 for sethoxydim. With an air induction flat fan nozzle, the forward angling of spray from 0° to 40° reduced the ED50 from 102.96 to 45.52 g a.i. ⋅ ha−1 for cycloxydim and from 209.91 to 92.80 g a.i. ⋅ ha−1 for sethoxydim. More angling did not improve the efficacy of these herbicides. Our results revealed that larger spray droplets needed more spray angle than smaller spray droplets to achieve an equal control.

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Authors and Affiliations

Akbar Aliverdi
ORCID: ORCID
Mojtaba Zarei

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