Waterfowl foraging in winter-flooded ricefields: Any agronomic benefits for farmers?

Brogi, Anne; Pernollet, Claire A.; Gauthier‐Clerc, Michel; Guillemain, Matthieu

doi:10.1007/s13280-015-0678-0

Cited by 13 publications

(6 citation statements)

References 28 publications

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“…At the scale of a field (i.e., the scale at which farmers and managers will likely act) winter flooding of rice fields is the most popular duck‐friendly post‐rice harvest agricultural practice worldwide because it is relatively easy to implement, can provide agronomic benefits (Bird et al , Manley et al , Anders et al , Brogi et al ), and makes waste seeds accessible to waterbirds (Pernollet et al ). According to Kross et al (), the methods that most benefit farmers and ducks include flooding fields and leaving standing‐stubble post‐harvest, incomplete burns post‐harvest, and generally practices that minimize mechanical treatment.…”

Section: Management Implicationsmentioning

confidence: 99%

Seed density and waterfowl use of rice fields in Camargue, France

et al. 2016

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European rice fields provide potential nocturnal foraging habitat to waterfowl during winter. Agricultural practices may influence seed density and accessibility, thereby influencing the extent to which ducks use this managed habitat. To assess the potential influence of post‐harvest stubble‐management practices (i.e., flooding, burning, chopping, disking, plowing, and their combinations) on waste rice and weeds, and to evaluate the link of the latter 2 with nocturnal duck abundance, we conducted an experiment in rice fields of the Camargue, France. We assessed the density of available seeds 3 times across the winter, from harvest in late October to departure of the wintering ducks in early February, over 2 winters (2012–2013, 2013–2014). We monitored nocturnal duck use of the fields during the second year. Initial post‐harvest rice and weed seed densities were positively correlated and highly variable. Mean seed density was not dependent on straw management procedure (i.e., burning, chopping, disking). Average rice density decreased by 89% and weed seed density by 69% between harvest and late winter. Seed depletion rate was dependent on initial seed density, and was greatest in plowed fields for rice. Winter flooding did not significantly affect seed depletion rate but was the main determinant of nocturnal duck use of the fields. Duck numbers were lower in burned fields than in chopped or disked fields. One hectare of rice field could support an average of 43 mallard (Anas platyrhynchos)‐sized ducks/day for the entire wintering season (i.e., 5,202 duck‐energy days/ha) given initial post‐harvest seed densities. Harvested rice fields have a great potential as nocturnal foraging habitat for wintering ducks in the Camargue. Plowing should be avoided and flooding promoted to better allow ducks to use these fields. © 2016 The Wildlife Society.

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Section: Management Implicationsmentioning

confidence: 99%

Seed density and waterfowl use of rice fields in Camargue, France

et al. 2016

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“…Not only does flooding facilitate habitat management, it also benefits growers by reducing viability of weed seed, decreasing soil erosion, and promoting decomposition of rice straw (Anders et al 2008;Manley et al 2005). In addition, waterfowl that find refuge in flooded fields are reported to enhance straw decomposition through trampling, and they even feed on waste rice, suggesting that weed-seed populations could be diminished, although this has not been proven (Brogi et al 2015;Manley et al 2005;Suh 2015). Thus, winter flooding has environmental and recreational benefits and potential benefits for weed management, which justifies investigation of how this practice affects herbicide efficacy.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of fall-applied residual herbicides on weedy rice control in rice (Oryza sativa L.)

Bertucci

Fogleman

Norsworthy³

2019

Weed Technol

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Field experiments were initiated near Colt, AR, in the fall of 2016 and continued through the summer of 2018 to evaluate rice tolerance and weedy (or red) rice control after fall-applied very-long-chain fatty acid (VLCFA)-inhibiting herbicides. A split-plot design was used for the experiment, with the whole-plot factor being winter condition (flooded or non-flooded) and the split-plot factors being herbicide and rate. Herbicide treatments included acetochlor, dimethenamid-P, pethoxamid, pyroxasulfone, and S-metolachlor applied at 1,050, 525, 420, 205, and 1,070 g ai ha−1 and at 2,100, 1,050, 840, 410, and 2,140 g ha−1 for low rates and high rates, respectively. Herbicides were applied in the fall, then ‘CL172’ rice was drill seeded in the spring of the following calendar year. Weedy rice control differed between years, but acetochlor and pyroxasulfone consistently provided the greatest levels of control across rates and flood conditions. Consequently, herbicides that best controlled weedy rice also caused the greatest injury to cultivated rice. Rice injury did not exceed 13% regardless of herbicide treatment at 3 wk after planting (WAP). However, the high rate of pyroxasulfone caused 20% rice injury at 5 WAP in 2018. Although it was expected that winter condition may affect residual activity of the VLCFA-inhibiting herbicides, herbicide selection and application rate both had much greater effects on rice injury and on weedy rice control. Based on these results, rice injury would be minimal or nonexistent after fall applications of the tested VLCFA inhibitors, and intermediate levels of weedy rice control may be achieved. The implementation of VLCFA-inhibiting herbicides in rice production systems would offer a novel herbicide site of action and offer a degree of selective control of weedy rice.

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“…Contrary to other traditional management methods used in the study area during the 1980s (e.g., high use of chemicals or stubble burning), which are widely recognized as being detrimental to waterbirds (Longoni 2010), flooding of rice fields has been demonstrated to increase the numbers of several bird species Oring 1998, 2003;Pernollet et al 2015a). This tech- nique, which started to be implemented in the 1990s in the Baix Ter wetlands, improves rice stubble decomposition, mainly because waterbirds tear the stubble into pieces, therefore improving its contact with soil (Bird et al 2000;van Groenigen et al 2003;Brogi et al 2015). The increase in decomposition also makes nitrogen more available the following spring (van Diepen et al 2004).…”

Section: Discussionmentioning

confidence: 99%