Influences of mechanical-weeding work time and frequency on Monochoria vaginalis control and paddy rice yields

Nakai, Joe; Nakahashi, Tomihisa

doi:10.3719/weed.56.111

Cited by 4 publications

(2 citation statements)

References 6 publications

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“… Relationship between the fresh weight and the plant density of M onochoria vaginalis . The data from Nakai and Nakahashi () were edited and analyzed. The numerals within the parentheses indicate the number of days after puddling when mechanical weeding was carried out.…”

Section: Discussionmentioning

confidence: 99%

“…In order to evaluate weed infestation, the plant density was measured in the main sampling instead of the biomass density in the preliminary sampling.The former is obtained rapidly and the number of repetitions can be increased easily for enhanced accuracy, whereas the latter conventionally is used to evaluate weed infestation that is directly related to effects on the main crop. As inferred from Figure 5 (Nakai & Nakahashi 2011), the relationship between these two indicators was almost stable within the block (year and field), regardless of the treatment (number and timing of mechanical weeding by a self-propelled, inter-row rotavator).This indicates in the current study that the use of the plant density is mostly appropriate for relative evaluation within the field as an alternative for the biomass density of the weed.…”

Section: Adequacy Of Using the Plant Density Of Monochoria Vaginalis mentioning

confidence: 99%

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Micro‐elevations in paddy fields affect the efficacy of mechanical weeding: Evaluation of weeding machines to control Monochoria vaginalis in herbicide‐free farming

Shoji

Itoh

Kawahara

et al. 2013

Weed Biology and Management

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Differences in local topography (micro‐elevation) within a paddy field that constitute a source of variability in agronomical indicators have not been considered thoroughly as a block factor in weed studies. This study investigated and evaluated the performance of weeding machines (weeders) in two herbicide‐free paddy fields that contained micro‐elevations. The plant density of Monochoria vaginalis, a typical and harmful paddy weed unless controlled with herbicides, was used as the indicator of the efficacy of the weeders. Among the three weeders that were tested, one suppressed M. vaginalis dramatically at low elevations and the others were less sensitive to micro‐elevation. For comparison across the fields, micro‐elevations at weed sampling locations were converted to the initial depth of water by using the records of hydrographs that had been set in each field. The relationship between the initial depth of water and the plant density of M. vaginalis was very clear with the use of the elevation‐sensitive weeder. Moreover, this relationship was valid, even with the less‐sensitive weeders. The finding that the greater the depth of water, the less the plant density was significant, even for M. vaginalis, a difficult aquatic paddy weed that was controlled with any of the weeders tested. Thus, micro‐elevation within a paddy field needs to be treated as a crucial block factor in weed‐sampling studies. A coarse survey of the level of a field and the installation of a hydrograph are recommended for a clear analysis of the background of weed control practices.

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Section: Discussionmentioning

confidence: 99%

Section: Adequacy Of Using the Plant Density Of Monochoria Vaginalis mentioning

confidence: 99%

Micro‐elevations in paddy fields affect the efficacy of mechanical weeding: Evaluation of weeding machines to control Monochoria vaginalis in herbicide‐free farming

Shoji

Itoh

Kawahara

et al. 2013

Weed Biology and Management

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No-herbicide paddy rice cultivation in combination with rice bran treatment of soil surface and mechanical weeding

Nakai¹,

Toritsuka²,

Kawamura³

2011

J. Weed Sci. Tech.

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Effects of planting density in organic cultivation of rice on the growth of <i>Monochoria vaginalis</i> (Burm. f.) Presl var. <i>plantaginea</i> (Roxb.) Solms-Laub.

Shimamune

Suzuki

2015

J. Weed Sci. Tech

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Influences of mechanical-weeding work time and frequency on Monochoria vaginalis control and paddy rice yields

Cited by 4 publications

References 6 publications

Micro‐elevations in paddy fields affect the efficacy of mechanical weeding: Evaluation of weeding machines to control Monochoria vaginalis in herbicide‐free farming

Micro‐elevations in paddy fields affect the efficacy of mechanical weeding: Evaluation of weeding machines to control Monochoria vaginalis in herbicide‐free farming

No-herbicide paddy rice cultivation in combination with rice bran treatment of soil surface and mechanical weeding

Effects of planting density in organic cultivation of rice on the growth of <i>Monochoria vaginalis</i> (Burm. f.) Presl var. <i>plantaginea</i> (Roxb.) Solms-Laub.

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