Weed Seedbank in Rice Fields

Mesquita, Mário Luiz Ribeiro

doi:10.5772/66676

Cited by 3 publications

(7 citation statements)

References 48 publications

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“…However, analysis of the data, after both the seasons, revealed that application of flucetosulfuron @ 25 g ha -1 at 10-12 DAS recorded the lowest number of broad leaved weeds emerged from the soil which was found to be on par with its application @ 20 and 30 g ha -1 at 10-12 DAS as well as with its application @ 20, 25, and 30 g ha Mesquita (2017) that herbicides are effective in reducing weed populations and hence the number of seeds added to the soil seed bank. Pereira et al (2013) found that before the application of the herbicide treatments there was the highest number of viable weed seeds in the study area and over the application of metalachlor+diuron and diuron + pendimethalin the number of weed seeds were reduced effectively.…”

Section: Resultsmentioning

confidence: 91%

“…In the rice field, many weed species occur which can produce enormous number of small seeds and vegetative propagules as an approach to subsist the pressures imposed by weed control methods (Munhoz and Felfli, 2006). Such seeds may remain on the soil surface or get buried after dispersal using biotic and abiotic agents, thus forming a potential seed bank which becomes the main source of weeds in rice cropping fields (Mesquita, 2017). Weed seedbanks are the main source of weed infestation in crops, and seed bank dynamics regulate the communities of many of the most important weed species (Barberi and Lo Cascio, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Weed seedbanks are the main source of weed infestation in crops, and seed bank dynamics regulate the communities of many of the most important weed species (Barberi and Lo Cascio, 2001). In rice fields, the size of the weed seedbank is highly flexible depending on the climate, relief position, soil moisture content, depth of sampling, cropping history of the areas, and management practices used by farmers (Mesquita, 2017). The size and configuration of weed seed banks and weed populaces can be reformed by the use of herbicides, planting methods, and the use of rice cultivars which are being commonly used by the farmers (Bhagat et al 1999).…”

Section: Introductionmentioning

confidence: 99%

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Impact of flucetosulfuron on weed seed bank in wet seeded rice

Arya¹,

Syriac²

2018

JANS

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An experiment was conducted to assess the impact of flucetosulfuron, a new generation sulfonylurea herbicide, on weed seed bank dynamics of wet land paddy field. Field experiments were carried out during two consecutive seasons (Kharif 2016 and Rabi 2016-'17), to assess the bio-efficacy of flucetosulfuron in wet seeded rice which was accompanied by weed seed bank assay. Weed seed bank assay of the soil was carried out before and after the field experiments in both the seasons by the seedling emergence method. The experiment on weed seed bank was laid out in Completely Randomised Block Design (CRD) with 12 treatments replicated thrice. Flucetosulfuron @ 20, 25, and 30 g ha -1 applied at 2-3, 10-12, and 18-20 days after sowing (DAS) along with two control treatments viz., hand weeding at 20 and 40 DAS and unweeded control comprised the treatments. The emerging weeds were uprooted at 14 days interval up to a period of two months; categorized as grasses, broad leaved weeds, and sedges and counted. Results revealed that non-herbicidal plots recorded significantly higher count of total emerged weeds compared to herbicide applied plots. In all the herbicide applied plots, effective reduction in weed seed bank could be obtained irrespective of the dose of the herbicide. Regarding the time of application, flucetosulfuron applied at 10-12 and 18-20 DAS recorded significantly lower weed seed bank during both the seasons, compared to its application at 2-3 DAS.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of flucetosulfuron on weed seed bank in wet seeded rice

Arya¹,

Syriac²

2018

JANS

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“…Germination method was used to investigate viable soil seed bank density because this method could precisely enumerate the readily germinable seeds [29]. Each soil sample was thoroughly mixed and spread evenly in a 410 cm × 265 cm × 75 cm germination containers to form an approximately 3 cm soil layer for germination.…”

Section: Seed Identification and Field Weed Investigationmentioning

confidence: 99%

“…Therein, the first one, i.e., trampling and foraging of ducks, could contribute the most proportion for weed control in the rice-duck system [13]. In arable fields, the vast majority of weed species are annuals and seeds that are mainly stored in the soil as soil seed bank is the major source for the renewal of weed populations [28,29]. Therefore, soil seed bank plays an important role in the composition of the weed communities and thus in their control.…”

Section: Introductionmentioning

confidence: 99%

Integrated Rice-Duck Farming Decreases Soil Seed Bank and Weed Density in a Paddy Field

et al. 2019

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Coupled cropping-breeding modes have been highly recommended due to their ecological and sustainable nature. Integrated rice-duck farming is a typical ecological planting system in rice paddy fields and has been widely popularized in Asia where a considerable area of cropland has been planting rice. In this study, two experimental treatments of turbid water or rice-duck treatment were established to compare with the control and a conventional treatment in absence of ducks. The turbid water treatment imitated the muddying effect by duck activities with the trampling and foraging effects excluded, while the rice-duck treatment included all of the mentioned effects by raising ducks in rice paddy field. Results showed that the rice-duck treatment significantly reduced soil seed bank density by more than 40% and the figures under the turbid water treatment were 18.2% and 30.5%, accordingly, in the early and late rice growing seasons. Moreover, the rice-duck treatment significantly altered the vertical distribution of soil seed bank by substantially declining the seed density in the topsoil (0–5 cm). Changes in soil seed bank density considerably contributed to the declines in above-ground weed density because a significant correlation was detected between the soil seed bank density in the early season and the weed density in the late season. Our results of declined soil seed bank and weed density in integrated rice-duck farming imply that this system is highly efficient as a biological pathway for controlling weeds.

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Revisiting the concept of the critical period of weed control

et al. 2021

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Weeds are a major biotic constraint to the production of crops. Studies on the critical period of weed control (CPWC) consider the yield loss due to the presence of all weeds present in the crop cycle. The CPWC is the time interval between the critical timing of weed removal (CTWR) and the critical weed-free period (CWFP), and the weed presence before and after the extremes of CTWR and CWFP may not significantly reduce crop yield. The crop yield is taken into consideration and weed density or biomass of individual weeds (annual or perennial) is not so important while calculating the CPWC. Only weed density or biomass is considered for calculating weed control efficiency of a particular management practice for which the weed seed bank is also a criterion. However, weed biomass is the outcome after competition experienced by each weed species with the fellow crop and the weeds. Consequently, the weed pressure in the subsequent season will be the cumulative effect of the preceding season too, which is unaccounted for in CPWC. It is argued that in organic farming or low-input farming systems, where herbicides are not used, the concept of CPWC can be misleading and should be avoided. It is concluded that CTWR is more meaningful than the CPWC.

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Weed Seedbank in Rice Fields

Cited by 3 publications

References 48 publications

Impact of flucetosulfuron on weed seed bank in wet seeded rice

Impact of flucetosulfuron on weed seed bank in wet seeded rice

Integrated Rice-Duck Farming Decreases Soil Seed Bank and Weed Density in a Paddy Field

Revisiting the concept of the critical period of weed control

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