water-weed growth | ScienceGate

Several cover crops (CCs) exert allelopathic effects that suppress weed growth. The aim of the present study was to evaluate the effects of aqueous extracts containing different concentrations [0, 0.5, 1, 2.5, 5, 7.5 and 10% (w/v)] of Brassicaceae CCs (Sinapis alba, Raphanus sativus, Camellina sativa) and of the CCs Fagopyrum esculentum and Guizotia abyssinica on germination and early growth of Ambrosia artemisiifolia L. The allelopathic effects were species and concentration-dependent. C. sativa, for example, caused the greatest potential to inhibit germination, shoot, radicle length and fresh seedling weight, whereas S. alba and R. sativus inhibited germination and early growth of A. artemisiifolia only at concentrations ≥7.5%. In contrast, no inhibition was observed when aqueous extracts of F. escultneum and G. abyssinica were added at any of tested concentration. Liquid chromatography-tandem mass spectrometry detected 15 phenolic compounds in Brassicaceae CCs with the highest content (µg/g) of vanillin (48.8), chlorogenic acid (1057), vanilic acid (79), caffeic acid (102.5) and syringic acid (27.3) in C. sativa. Our results suggest that C. sativa is the most allelopathic CCs and that the fruits of C. sativa are the plant organs richest in allelochemicals.

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Population genetics of the invasive water weed Elodea canadensis in Finnish waterways

Plant Systematics and Evolution ◽

10.1007/s00606-011-0442-2 ◽

2011 ◽

Vol 294 (1-2) ◽

pp. 27-37 ◽

Cited By ~ 8

Author(s):

T. Huotari ◽

H. Korpelainen ◽

E. Leskinen ◽

K. Kostamo

Keyword(s):

Population Genetics ◽

Elodea Canadensis ◽

Water Weed

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Weed control in corn and weed sample size for growth evaluations

Planta Daninha ◽

10.1590/s0100-83582014000100006 ◽

2014 ◽

Vol 32 (1) ◽

pp. 51-59 ◽

Cited By ~ 1

Author(s):

L.B. Tavella ◽

P.S.L. Silva ◽

V.R. Oliveira ◽

P.L.O. Fernandes ◽

R.P. Sousa

Keyword(s):

Grain Yield ◽

Sample Size ◽

Weed Control ◽

Block Design ◽

Corn Yield ◽

Weed Growth ◽

Randomized Block Design ◽

Experimental Variation ◽

Yield Values ◽

Viable Seeds

The objectives of this study were to evaluate baby corn yield, green corn yield, and grain yield in corn cultivar BM 3061, with weed control achieved via a combination of hoeing and intercropping with gliricidia, and determine how sample size influences weed growth evaluation accuracy. A randomized block design with ten replicates was used. The cultivar was submitted to the following treatments: A = hoeings at 20 and 40 days after corn sowing (DACS), B = hoeing at 20 DACS + gliricidia sowing after hoeing, C = gliricidia sowing together with corn sowing + hoeing at 40 DACS, D = gliricidia sowing together with corn sowing, and E = no hoeing. Gliricidia was sown at a density of 30 viable seeds m-2. After harvesting the mature ears, the area of each plot was divided into eight sampling units measuring 1.2 m² each to evaluate weed growth (above-ground dry biomass). Treatment A provided the highest baby corn, green corn, and grain yields. Treatment B did not differ from treatment A with respect to the yield values for the three products, and was equivalent to treatment C for green corn yield, but was superior to C with regard to baby corn weight and grain yield. Treatments D and E provided similar yields and were inferior to the other treatments. Therefore, treatment B is a promising one. The relation between coefficient of experimental variation (CV) and sample size (S) to evaluate growth of the above-ground part of the weeds was given by the equation CV = 37.57 S-0.15, i.e., CV decreased as S increased. The optimal sample size indicated by this equation was 4.3 m².

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Weed Management and Fertility Levels Influence on Weed Growth and Performance of Wheat (Triticum aestivum L.)

International Journal of Current Microbiology and Applied Sciences ◽

10.20546/ijcmas.2019.804.239 ◽

2019 ◽

Vol 8 (04) ◽

pp. 2038-2044

Author(s):

Anshul Gupta ◽

S.S. Yadav ◽

L.R. Yadav ◽

A.K. Gupta

Keyword(s):

Triticum Aestivum ◽

Weed Management ◽

Triticum Aestivum L ◽

Weed Growth ◽

And Performance

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(220) Pelargonic Acid Weed Control Parameters

HortScience ◽

10.21273/hortsci.41.4.1034d ◽

2006 ◽

Vol 41 (4) ◽

pp. 1034D-1034 ◽

Cited By ~ 1

Author(s):

Charles L. Webber ◽

James W. Shrefler

Keyword(s):

Weed Control ◽

Field Research ◽

Pelargonic Acid ◽

Nonanoic Acid ◽

Ionic Surfactant ◽

Application Timing ◽

Weed Growth ◽

Time Period ◽

Visual Damage ◽

Multiple Species

Producers and researchers are interested in pelargonic acid (nonanoic acid) as a broad-spectrum postemergence or burn-down herbicide. Pelargonic acid is a fatty acid naturally occurring in many plants and animals, and present in many foods we consume. The objective of this research was to determine the effect of pelargonic acid concentration, adjuvants, and application timing on weed control efficacy as a burn-down herbicide. Field research was conducted at Lane, Okla. (southeast Oklahoma), during the 2005 growing season. One month prior to spraying the weed control treatments, the land was cultivated to kill the existing weeds and provide a uniform seed bed for new weed growth. The factorial weed control treatments included three application concentrations of Scythe (57.0% pelargonic acid) applied at 3%, 6.5%, and 10%; three adjuvants (none, orange oil, and non-ionic surfactant); and two application dates. All herbicide treatments were applied with an application volume of 935 L/ha to seedling weeds. The experiment had a high weed density with multiple species of grass and broadleaf weeds. Weed control across species increased as the herbicide concentrations increased from 0% to 10%. At all concentrations applied, pelargonic acid produced greater weed control for a longer time period for the broadleaf weeds than the grass weeds. Visual damage to the weeds was often apparent within a few hours after application. There was a significant increase in weed control when applied to the younger weeds. In this research, pelargonic acid was effective in controlling both broadleaf and grass weeds as a burn-down herbicide, although crabgrass was tougher to control.

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A Comparison of the Attributes of Pine Straw from Southern Pine Species

Journal of Environmental Horticulture ◽

10.24266/0738-2898-39.3.115 ◽

2021 ◽

Vol 39 (3) ◽

pp. 115-122

Author(s):

Zachary Singh ◽

Adam Maggard ◽

Rebecca Barlow ◽

John Kush

Keyword(s):

Soil Moisture ◽

Soil Temperature ◽

Soil Properties ◽

Soil Nutrients ◽

Longleaf Pine ◽

Pinus Palustris ◽

Pinus Elliottii ◽

Slash Pine ◽

Weed Growth ◽

Pine Straw

Abstract Longleaf pine (Pinus palustris Mill.), and slash pine (Pinus elliottii Engelm.) are two southern pine species that are popular for producing pine straw for landscaping. The objective of this research was to determine the response of soil properties and weed growth to the application of pine straw. Longleaf pine, slash pine, and two non-mulched controls (with and without chemical weed control) were tested. Volumetric soil water content, soil nutrients, soil temperature, weed biomass, and seedling growth were measured. Compared to non-mulched controls, both longleaf and slash pine plots had a greater soil moisture during extended periods without rainfall in the full sun environment. When soil temperatures increased, mulched plots had lower soil temperature relative to non-mulched plots. Soil pH and soil nutrients were generally similar between pine straw types with few significant differences in measured variables. Both pine straw treatments reduced weed growth and longleaf pine maintained a greater straw depth over the study period compared to slash pine, but no differences were observed for decomposition. These results indicate that longleaf pine straw and slash pine straw perform equally as well in terms of increasing soil moisture, moderating soil temperature, and reducing weed growth compared to not using mulch. Index words: Pinus elliottii, Pinus palustris, organic mulch, soil properties, landscaping. Species used in this study: Shumard oak, Quercus shumardii Buckl., Eastern redbud, Cercis canadensis L.

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