Nitrogen application influenced the critical period for weed control in cotton

Tursun, Nihat; Datta, Avishek; Tuncel, Emine; Kantarci, Zekeriya; Knežević, Stevan Z.

doi:10.1016/j.cropro.2015.04.007

Cited by 28 publications

(16 citation statements)

References 33 publications

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“…The end of the CPWC was also later in our study than has been reported in many previous studies, extending late into the growing season for 50 common sunflower plants m −2 (1,512 GDD, or 136 DAE or more), with most other studies reporting the end of the CPWC at 42 to 84 DAE (Bukun 2004;Cardoso et al 2011;Korres and Norsworthy 2015;Papamichail et al 2002;Tursun et al 2015). Tursun (2016), for example, calculated the end of the CPWC at 67 and 60 DAE, but the weeds were also less competitive in Tursun's study, with a biomass of 1,340 and 1,310 g m −2 at 1,000 GDD (2012 and 2013, respectively), compared with 1,550 g m −2 mid season for 50 common sunflower plants m −2 in our study.…”

Section: Plant Height and Biomasssupporting

confidence: 82%

Determining the critical period for weed control in high-yielding cotton using common sunflower as a mimic weed

et al. 2019

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Field studies were conducted over six seasons to determine the critical period for weed control (CPWC) in high-yielding cotton, using common sunflower as a mimic weed. Common sunflower was planted with or after cotton emergence at densities of 1, 2, 5, 10, 20, and 50 plants m−2. Common sunflower was added and removed at approximately 0, 150, 300, 450, 600, 750, and 900 growing degree days (GDD) after planting. Season-long interference resulted in no harvestable cotton at densities of five or more common sunflower plants m−2. High levels of intraspecific and interspecific competition occurred at the highest weed densities, with increases in weed biomass and reductions in crop yield not proportional to the changes in weed density. Using a 5% yield-loss threshold, the CPWC extended from 43 to 615 GDD, and 20 to 1,512 GDD for one and 50 common sunflower plants m−2, respectively. These results highlight the high level of weed control required in high-yielding cotton to ensure crop losses do not exceed the cost of control.

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Section: Plant Height and Biomasssupporting

confidence: 82%

Determining the critical period for weed control in high-yielding cotton using common sunflower as a mimic weed

et al. 2019

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“…It is important to point out that the interference does not encompass the entire culture cycle and that the control of weeds must be conducted during the adequate period, that is, during the period of total prevention of the interference (PTPI) of these plants on the cultures (Yirefu et al, 2012;Singha et al, 2014;Tursun et al, 2015;Matloob et al, 2015), also considering the structure of the infesting community on the environment, represented by the occurring species, their density and distribution.…”

Section: Introductionmentioning

confidence: 99%

Bank of Weed Seeds in Agrosystems in the Brazilian Cerrado

et al. 2016

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-The seed bank is the reserve of viable seeds found in the soil and is related to diversity and abundance of species that make up the weed populations. This study aimed to determine the seed bank in four distinct environments (grazing area, area of vegetables, annual crop area and perennial crop area) in two seasons (rainy and dry season). To determine the seed bank, each environment was divided into four sub-areas of 0.2 hectares, considering that each area was a repetition, totaling 16 experimental units. Samples of 0.8 kg were taken from each area, and each sample was distributed on a plastic tray and allowed to germinate in a greenhouse. The density of the individuals was determined by observing the number of emerging seedlings in the trays, performing the counting at every 18 days. Evaluations were made for ninety days in each season. The germination curve was calculated, as well as the Shannon diversity index (H'), the Sorensen similarity index and the relative importance. The seven main species identified in the environments were Cyperus rotundus, Nicandra physaloides, Galinsoga parviflora, Alternanthera tenella, Panicum maximum, Portulaca oleracea and Eleusine indica. Among the studied environments, during the rainy season, the highest number of individuals was found in annual crop and the greatest diversity in the evergreen environment. During the dry season, the number and diversity of individuals were lower and similar in all environments.Keywords: rainy season, dry season, Shannon index, relative importance, diversity. Palavras-chave: estação das chuvas, estação da seca, índice de Shannon, importância relativa, diversidade. RESUMO -O banco de sementes é a reserva de sementes viáveis encontradas no solo e está relacionado à diversidade e abundância das espécies que compõem as populações de plantas daninhas. Com este estudo, objetivou-se determinar o banco de sementes em quatro ambientes distintos (área de pastagem, área de hortaliças, área de cultura anual e área de cultura perene), em duas épocas do ano (estação das chuvas e da seca

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“…Sorghum plant has a low competitive ability against weeds at early growth stages therefore critical period would start sooner mainly under N fertilizer conditions. As showed by Tursun et al (2015), application of N fertilizer delayed the beginning of the CPWC F0_16 F1_16…”

Section: Determination Of the Critical Period Of Weed-sorghum Competimentioning

confidence: 88%

“…Some stages are most sensitive to weed infestation and if weeds are not controlled in this stage maximum yield loss will occur which period is called the critical period for weed control (Kumar et al 2013). Several studies (Kumar et al, 2015;Tursun et al 2015;Yadav et al 2018) reported that weed interference outside the critical period of weed control had a negligible effect on crop yield. Hence, determination of this critical period is essential for better management of weed and was the first step for integrated weed management (IWM) strategies (Knezevic et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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Mbaye

Guèye

et al. 2020

J. Res. Weed Sci.

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Weeds are among the most harmful factors limiting sorghum production under Sudanian conditions of southern Senegal. Despite, the taxonomic structure of the flora is relatively well known, few studies have focused on crop-weed competition. Field experiment was carried out to determine the critical time for weed competition in grain sorghum. Ten treatments, weedy for initial 15, 30, 45 and 60 DAS and then weed-free, and weed-free for initial 15, 30, 45 and 60 DAS and then weedy, weed-free and weedy up to harvest were assigned in a randomized block design with four replications. The beginning and the end of critical period of weed competition were determined respectively under fertilized and unfertilized conditions. The results showed that more the weeds competition is longer, more sorghum parameters of growth and yield are reduced. Sorghum yield were significantly influenced by many factors such as year, nitrogenous fertilization and weeding periods. The highest plant height, dry matter, and yield were recorded in weed free treatment followed by weed free up to 60 DAS and weedy up to 15 DAS. Plant height, dry matter and yield decreased significantly with each increase in competition period. Therefore, the lowest growth parameters and yield were noticed in weedy check treatment followed by weedy up to 60 DAS and weed free up to 15 DAS. Moreover, our findings showed that sorghum height, dry matter and grain yield increased significantly under fertilized conditions compared to unfertilized conditions, which is widely used in traditional cropping system. The maximum competition between crop and weed was between 15-45 and 15-55 DAS under unfertilized conditions (F0) and 10-55 and 15-55 DAS under fertilized conditions (F1), which can be considered as critical period of crop-weed competition. The weeding practice should be adopted during these periods for getting optimum sorghum production under Sudanian conditions of Senegal.

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Nitrogen application influenced the critical period for weed control in cotton

Cited by 28 publications

References 33 publications

Determining the critical period for weed control in high-yielding cotton using common sunflower as a mimic weed

Determining the critical period for weed control in high-yielding cotton using common sunflower as a mimic weed

Bank of Weed Seeds in Agrosystems in the Brazilian Cerrado

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