Temporal and spatial distributions of velvetleaf seedlings after 1 year's seeding

Zhang, Jianhua; Hamill, Allan S.

doi:10.1017/s0043174500090822

Cited by 4 publications

(3 citation statements)

References 16 publications

(22 reference statements)

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“…That explain the special relationship between the distribution of the parent plants and their off springs over the years. The horizontal dispersal of seed with reduced seed inputs at the infested location while increasing distribution to other locations can also be related to "safe site" availability Zhang et al (1998), Jaganathan and Liu (2015).…”

Section: Tillage Operationsmentioning

confidence: 99%

Review of the Influence of Crop Rotation and Primary Tillage Operations on Weed Seed Bank

Al‐Hajaj¹

2021

Int. J. Res. Granthaalayah

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In this study, we reviewed weed seed bank dynamic and main agriculture operations to come up with the weed seed management modeling designed to increase crop productivity by removing weed competition. Weed contributing with 10% loss of total global grain production. Weed seed bank regulate by five demographic processes seedling recruitment and survival, seed production, dispersal and seed survival in soil. The main agriculture operations that interference with weed seed bank are crop rotation and primary tillage. Tillage systems affect weed emergence, management, and seed production; therefore, changing tillage practices changes the composition, vertical distribution, and density of weed seed bank in agricultural soils. Weed species vary in their response to various crop rotations, due to the variability of weed-crop competition in their relative capacity to capture growth–limiting resources. Crop rotations affect weed emergence, management, composition, and density of weed seed bank. Finally, the study suggests elevating crop competitiveness against weeds, through a combination of crop rotation and reduce_ zero tillage, has strong potential to reduce weed-induced yield losses in crop.

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Section: Tillage Operationsmentioning

confidence: 99%

Review of the Influence of Crop Rotation and Primary Tillage Operations on Weed Seed Bank

Al‐Hajaj¹

2021

Int. J. Res. Granthaalayah

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“…If they are not, then the predictive value of these maps might be minimal. Although patch stability depends on the species, some of the key target species for patch treatment, such as common sunflower or cleavers, have been shown to have relatively stable patches (Gerhards et al 1997;Hamouz et al 2004;Zhang and Hamill 1998). Although rhizomatous species such as Johnsongrass are expected to be relatively stable in their location, plant densities can change depending on the management practices and environmental conditions present during the growing season.…”

mentioning

confidence: 99%

Reliability of a Visual Recognition System for Detection of Johnsongrass(Sorghum halepense) in Corn

Andújar

Ribeiro

Fernández‐Quintanilla

et al. 2011

Weed technol.

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The feasibility of visual detection of weeds for map-based patch spraying systems needs to be assessed for use in large-scale cropping systems. The main objective of this research was to evaluate the reliability and profitability of using maps of Johnsongrass patches constructed at harvest to predict spatial distribution of weeds during the next cropping season. Johnsongrass patches visually were assessed from the cabin of a combine harvester in three corn fields and were compared with maps obtained in the subsequent year prior to postemergence herbicide application. There was a good correlation (71% on average) between the position of Johnsongrass patches on the two maps (fall vs. spring). The highest correlation (82%) was obtained with relatively large infestations, whereas the lowest (58%) was obtained when the infested area was smaller. Although the relative positions of the patches remained almost unchanged from 1 yr to the next, the infested area increased in all fields during the 4-yr experimental period. According to our estimates, using a strategy based on spraying full rates of herbicides to patches recorded in the map generated in the previous fall resulted in higher net returns than spraying the whole field, either at full or half rate. This site-specific strategy resulted in an average 65% reduction in the volume of herbicide applied to control this weed.

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“…If this is true, we would conclude that weed population spread is seed limited. However, Zhang and Hamill (1998) reported that there was not always a close spatial relationship between parent plants and their offspring, suggesting that weed patch or infestation spread also is limited by the presence of suitable microsites.…”

mentioning

confidence: 99%

Seed and microsite limitations to emergence of four annual weed species

Boyd

Acker

2004

Weed sci.

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The emergence of annual species depends on the number of seeds present and the biotic and abiotic conditions directly surrounding those seeds (the microsite). A field experiment was conducted to study the relative importance of seed presence vs. microsite conditions in determining the emergence of four annual species. Green foxtail, wild mustard, wild oat, and canola were seeded at 200, 400, and 1,200 seeds m−2in separate plots in a coarse, loamy, mixed Typic Haplocryoll and a fine, mixed Typic Haplocryoll soil. Five microsite modification treatments (control, irrigation, soil compaction, soil compaction plus irrigation, and no crop) were applied to all weed seed density treatments for each weed species. All plots were seeded to spring wheat. Irrigation or soil compaction increased percent emergence of wild oat. Green foxtail emergence tended to increase with soil compaction in 2001 but not in 2002. Wild mustard and canola emergence were largely unaffected by microsite modification treatments. Weed emergence increased with increasing seed density for all species, but the proportion of the total number of seeds emerging decreased with increasing seed density for all species. We suggest that the emergence of the four weed species in this experiment was both seed and microsite limited. Increasing the number of seeds in the soil increased the probability of seeds landing within an appropriate microsite. For these four species, therefore, weed spread and weed patch formation may be determined both by seed production and dispersal and by variability in soil microsite conditions. Results suggest that weed management practices should limit seed dispersal of all species and discourage weed emergence of hard-to-control species during critical establishment periods.

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Temporal and spatial distributions of velvetleaf seedlings after 1 year's seeding

Cited by 4 publications

References 16 publications

Review of the Influence of Crop Rotation and Primary Tillage Operations on Weed Seed Bank

Review of the Influence of Crop Rotation and Primary Tillage Operations on Weed Seed Bank

Reliability of a Visual Recognition System for Detection of Johnsongrass(Sorghum halepense) in Corn

Seed and microsite limitations to emergence of four annual weed species

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