Weed survey in cotton (<i>Gossypium hirsutum</i>L.) and sunflower (<i>Helianthus annuus</i>L.) fields in the Pandamatenga plains of northeastern Botswana

Abdullahi, A.E

doi:10.1080/02571862.2004.10635017

Cited by 9 publications

(6 citation statements)

References 8 publications

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“…Worldwide, weeds and weed control have become a major cost factor determining the economic profitability of crop production [1]. Weeds compete with crops for light, nutrients and moisture, resulting in losses of grain yield and quality.…”

Section: Introductionmentioning

confidence: 99%

Potential of Aqueous Extracts from Parts of the Pepper Tree (Schinus molle L.) to Affect Emergence and Seedling Development of Wheat (Triticum sativa L.) and Weeds in a Manure Amended Soil~!2008-09-12~!2008-11-15~!2008-12-05~!

Materechera¹,

Hae²

2008

TOASJ

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Abstract:The allelopathic potential of aqueous extracts from fruits, leaves, roots and bark of the pepper tree (Schinus molle L.) were investigated on emergence and seedling development of wheat (Triticum sativa L.) and agricultural weeds. Different concentrations of the original extract (undiluted, 1:1, 1:3 and water, v/v) were applied to a soil amended with cattle manure in 2-litre pots. Extracts from all the tree parts significantly (p < 0.05) reduced seedling emergence, height and dry matter yields of wheat and weed seedlings compared to the control (water). The inhibitory effects on both wheat and weed seedlings were consistently in the order fruit=leaves >roots>bark. The inhibitory effects were however progressively reduced by diluting the original extracts suggesting that there was reduction in the concentration of the compounds inhibiting the emergence and development of seedlings.The weed population and species composition were negatively affected by tree extracts but improved with dilution of the extracts. It was observed that grass weed species were relatively more adversely affected by the inhibitory compounds in the extracts than broad leaf species at each level of extract dilution. The results confirm the presence of water-soluble compounds in the tissues of the pepper tree which can inhibit seedling emergence and growth of wheat and weed seedlings. It is concluded that the pepper tree posses allelopathic characteristics that may be explored for weed management in agriculture. Further investigations are recommended to elucidate the nature of the phytotoxin, formulation, mode of application and the appropriate economic way of exploiting this potential.

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Section: Introductionmentioning

confidence: 99%

Potential of Aqueous Extracts from Parts of the Pepper Tree (Schinus molle L.) to Affect Emergence and Seedling Development of Wheat (Triticum sativa L.) and Weeds in a Manure Amended Soil~!2008-09-12~!2008-11-15~!2008-12-05~!

Materechera¹,

Hae²

2008

TOASJ

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“…It grows in a variety of soils from heavy clay soils to sandy soils (Mapaure, 1994), and some areas on "black cotton soils" (Barbosa, 1970). It was, therefore, not surprising to observe that it was dominant in Pandamatenga, an area that has been designated for commercial arable farming owing to its fertile "black cotton soils" (Pardo et al, 2003;Abdullahi, 2004). Baikiaea plurijuga was the most frequent species in residential areas of Kazungula, Kasane and Kavimba.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Diversity and Composition of Tree Species in Residential Areas of Chobe District, Northern Botswana

KASHE¹,

TEKETAY²,

MMUSI³

et al. 2022

AgricultForest

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A vegetation survey was conducted in Chobe district to document tree species in residential areas. The survey resulted in 44 tree species, representing 44 genera and 22 families across the nine study villages. The diversity and evenness ranged from 2.47-3.15 and 0.77-0.90, respectively. An average of 19, 7 and 5 native, exotic and alien tree species respectively, were recorded. The most frequent native tree species, e.g. Baikiaea plurijuga, in the residential areas was also the dominant species in the neighbouring woodlands, suggesting that the species was retained when the woodlands were converted to residential use. The indigenous fruit bearing tree species, namely Berchemia discolor and Sclerocarya birrea, and the exotic fruit-bearing tree species, namely Carica papaya and Mangifera indica, were dominant in most residential areas, signifying their contribution to household food security. Invasive alien tree species, Jatropha curcas and Leucaena leucocephala were most frequent and, therefore, need continuous monitoring to prevent their spread into natural ecosystems. The study recommends raising of public awareness about invasiveness of alien invasive tree species.Keywords: Native species; exotic species; alien species; invasive species; ecosystem services INTRODUCTION Tree species provide ecosystem services such as provisioning services (e.g. fuel-wood), cultural servies (e.g. spiritual service) and regulating services (e.g. climate regulation). In rural areas, they are essential in provision of firewood

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“…The methodology used in this weed survey was similar to McCully et al (1991). Weed species density and identification, as well as crop density, were determined in twenty 1 m 2 quadrats in each field to be consistent with McCully et al (1991) and other similar weed surveys (Thomas, 1985;Goodwin et al 1986;Thomas and Ivany, 1990;Thomas et al, 1994;Abdullahi, 2004). Weeds were identified based on personal knowledge and use of Aiken and Darbyshire (1990), Bouchard et al (1999), Cobb et al (2005), D'Appollonio (2019), Dore and Roland (1942), Jensen et al (2005), Munro et al (2014), Néron et al (2015), Newcomb and Morrison (1977), Pohl (1968), Sampson et al (1990), Symonds and Merwin (1963), Symonds and Chelminski (1958), and Uva et al al (1997).…”

Section: Methodsmentioning

confidence: 99%

Weed Survey of Nova Scotia Lowbush Blueberry (Vaccinium AngustifoliumAit.) Fields

Lyu

McLean

McKenzie‐Gopsill

et al. 2021

International Journal of Fruit Science

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Weed surveys provide the basis for weed management research in lowbush blueberry, but have not been conducted in Nova Scotia since 2001. Documented declines in herbicide efficacy, loss and/or acquisition of herbicide active ingredients, confirmation of herbicide-resistant weed biotypes, and documented vectoring of weed seeds by machinery necessitate a new weed survey. A total of 165 bearing year lowbush blueberry fields were surveyed from 2017 to 2019, within which approximately 211 weed species were identified. Most weed species were herbaceous perennial forbs (89 species) and woody perennials (50 species), followed by annual broadleaf (24 species) and perennial grass weeds (20 species). The remaining flora consisted of a range of ferns, biennials, sedges and rushes, and orchids. The most common weed species were red sorrel (Rumex acetosella L.), poverty oatgrass (Danthonia spicata L. Beauv.), haircap moss (Polytrichum commune Hedw.), hair fescue (Festuca filiformis Pourr.), narrow-leaved goldenrod (Euthamia graminifolia (L) Nutt.), tickle grass (Agrostis hyemalis (Walter) BSP.), woolly panicum (Panicum lanugosum Ell.), cow wheat (Melampyrum lineare Desr.), bunchberry (Cornus canadensis L.), and yellow hawkweed (Hieracium caespitosum Dumort). Increased occurrence of these weed species is likely the result of documented or observed reductions in hexazinone and terbacil efficacy, confirmation of triazine-resistant biotypes, and common occurrence of seeds of these weed species on machinery. Low crop prices have also caused reduced pronamide use, contributing to increased occurrence of hair fescue. Results are guiding future research priorities for weed management in lowbush blueberry.

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Weed survey in cotton (Gossypium hirsutumL.) and sunflower (Helianthus annuusL.) fields in the Pandamatenga plains of northeastern Botswana

Cited by 9 publications

References 8 publications

Potential of Aqueous Extracts from Parts of the Pepper Tree (Schinus molle L.) to Affect Emergence and Seedling Development of Wheat (Triticum sativa L.) and Weeds in a Manure Amended Soil~!2008-09-12~!2008-11-15~!2008-12-05~!

Potential of Aqueous Extracts from Parts of the Pepper Tree (Schinus molle L.) to Affect Emergence and Seedling Development of Wheat (Triticum sativa L.) and Weeds in a Manure Amended Soil~!2008-09-12~!2008-11-15~!2008-12-05~!

Assessment of Diversity and Composition of Tree Species in Residential Areas of Chobe District, Northern Botswana

Weed Survey of Nova Scotia Lowbush Blueberry (Vaccinium AngustifoliumAit.) Fields

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