Assessing the Competitive Ability of Rhynchosia capitata; an Emerging Summer Weed in Asia

Ali, Hafiz Haider; Tanveer, Asif; Naeem, Muhammad; Jamil, Moazzam; Iqbal, Muhammad Aamir; Chadhar, Asim Raza; Kashif, Muhammad

doi:10.1590/0100-83582015000200002

Cited by 5 publications

(3 citation statements)

References 7 publications

(4 reference statements)

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“…Weeds are unwanted plants which compete with the associated crop plants for space, moisture, nutrients and light, and thus obstruct the growth, eventually decreasing the yield both qualitatively and quantitatively. Most of the studies have concentrated on the determination of yield losses due to competition and critical levels of weed-crop competition (Ali et al, 2015). Recently, the determination of yield losses due to weed-crop allelopathic interactions has been undermined.…”

Section: Crop Yieldmentioning

confidence: 99%

Weeds Cause Losses in Field Crops through Allelopathy

2016

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A large number of weeds are known to be associated with crops and causing economic losses. Weeds interfere with crops through competition and allelopathy. They produce secondary metabolites known as allelochemicals, which belong to numerous chemical classes such as phenolics, alkaloids, fatty acids, indoles, terpens etc. However, phenolics are the predominant class of allelochemicals. The allelochemicals release from weed plants takes place through leaf leachates, decomposition of plant residues, volatilization and root exudates. Weeds leave huge quantities of their residues in field and affect the associated, as well as succeeding crops, in various cropping systems. Liberation of allelochemicals from weeds affects the germination, stand establishment, growth, yield and physiology of crop plants. They cause substantial reduction in germination and growth of the crop plants by altering various physiological processes such as enzyme activity, protein synthesis, photosynthesis, respiration, cell division and enlargement, which ultimately leads to a significant reduction in crop yield. In crux, allelopathic weeds represent a potential threat for crop plants and cause economic losses.

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Section: Crop Yieldmentioning

confidence: 99%

Weeds Cause Losses in Field Crops through Allelopathy

2016

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“…Optimum weed free period required for satisfactory yield and range of weed related yield reductions and monetary losses in field crops of Punjab province (where major area and production of these crops is found) are presented in Table 1. The reasons for these losses include weed-crop competition, high weed management costs, and interference of weeds with crop management practices (Abbas et al, 2006;Ali et al, 2015aAli et al, , 2015b. Further negative impacts of weeds are faced during harvesting, marketing, and storage.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

“…Being a botanical pest, weeds share similar trophic level as that of crop plants, and weed-crop competition results in a substantial crop yield loss (Ali et al, 2015b;Javaid et al, 2016;Ramesh et al, 2017). The cost incurred in M A N U S C R I P T…”

Section: Introductionmentioning

confidence: 99%

Challenges and prospects for weed management in Pakistan: A review

et al. 2020

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Weed management has become increasingly important in the backdrop of sustainable crop production, uncertain climatic patterns and food security concerns in Pakistan. Due to diverse agro-climatic conditions, 267 weed species have been identified to be responsible for causing monetary loss worth 3 billion USD annually. Weed competition for resources, interference with crops, weed-related increased incidence of pests and diseases in different crops, and high management costs incurred in controlling weeds make weed management a critical task for the farmers.Moreover, herbicide resistant weeds, labor shortage, higher wages, weed population shifts, changing climatic optima, unavailability of proper and timely inputs, ever increasing threats of invasive weeds, lack of knowledge and training regarding herbicides, and the poor financial resources of the small land holders are major hurdles towards effective weed management in Pakistan. These multi-dimensional problems need holistic line of action with multidisciplinary collaboration. Improved knowledge of weed ecology, biology, genetics and molecular biology is essential for developing sustainable weed control practices. Some advances are already commercialized, and others are in the process of development. Advancements like vision guided machines for site-specific weed management, recognition and application modules, development of air inclusion nozzles, nanoherbicides, water based formulations with fewer hydrocarbons, herbicide-resistant transgenic crops, robotics to monitor and spray weeds, decision support systems and predictive modeling can be adopted to foster modern weed management in the country. Various conventional weed management approaches like narrow row spacing, row orientation, increased

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