Water balances and evapotranspiration in water- and dry-seeded rice systems

Linquist, Bruce A.; Snyder, Richard L.; Anderson, Frank E.; Espino, Luis; Inglese, Paolo; Marras, Serena; Moratiel, R.; Mutters, Randall; Nicolosi, Placido; Rejmanek, H.; Russo, Alfonso; Shapland, T. M.; Song, Zhenwei; Swelam, Atef; Tindula, Gwen N.; Hill, J. E.

doi:10.1007/s00271-015-0474-4

Cited by 70 publications

(46 citation statements)

References 24 publications

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“…In California, the only alternative to water seeding currently in use is dry seeding followed by flooding after early postemergent herbicide applications. Recent research, however, indicates that drill seeding into dry soil as practiced in California rice systems does not necessarily reduce crop evapotranspiration, crop coefficient, or irrigation delivery (in millimeters) in comparison with the continuously flooded system (Linquist et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Weed Community Dynamics and System Productivity in Alternative Irrigation Systems in California Rice

2016

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Over the last 10 yr, California has experienced a series of ever-worsening droughts. Rice, traditionally a flooded crop, has come under increasing scrutiny with respect to its water use, leading to proposals to evaluate alternative irrigation systems. For growers, weed competition is one of the most limiting factors to maintaining high yields, so understanding the shifts among species in weed communities under the proposed alternative irrigation systems is vital. A field study was conducted from 2012 to 2014 to compare weed population and growth dynamics with three irrigation systems: (1) a conventional water-seeded control system (WS-Control), with a permanent flood of 10 to 15 cm from planting until 1 mo prior to harvest; (2) a water-seeded alternate wet and dry system (WS-AWD), with the field flooded from planting until canopy closure, after which floodwater was allowed to subside and the field was reflooded when the soil volumetric water content reached 35%; and (3) a drill-seeded alternate wet and dry system (DS-AWD), with rice drill seeded and then flush irrigated to establish the crop, after which the field was flooded until canopy closure and then underwent an alternate wet and dry (AWD) treatment similar to WS-AWD. In the AWD treatments, there were two drying periods, neither of which occurred after the heading stage. The dynamics of major weed species were evaluated using plant density counts (2012) and relative cover and biomass (2013 and 2014). Grasses (sprangletop and watergrass species) dominated the DS-AWD system; sedges, broadleaves, and grasses dominated both WS systems. The WS-AWD system increased smallflower umbrella sedge relative cover at canopy closure, relative dry weight at harvest, and percent frequency when compared with the WS-Control system. Yields did not differ across treatments when weeds were controlled (P > 0.05); in the absence of herbicides, yields in the WS-AWD were equivalent to the WS-Control (ranging from 40 to 65% of the herbicide-treated yields) and zero in the DS-AWD due to weed pressure. Nomenclature: bearded sprangletop, Leptochloa fusca (L.) Kunth N. Snow; ducksalad, Heteranthera rotundifolia (Kunth) Griseb.; redstem, Ammannia coccinea Rottb.; ricefield bulrush, Schoenoplectus mucronatus (L.) Palla; smallflower umbrella sedge, Cyperus difformis L.; rice (Oryza sativa L.).

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Section: Introductionmentioning

confidence: 99%

Weed Community Dynamics and System Productivity in Alternative Irrigation Systems in California Rice

2016

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“…Transmission could be minimized by a basin-scale management approach based upon 694 strategic disruption of spatial networks of agriculture. Accurate crop-specific maps could provide a 695 useful input into a network-based approach to understanding agricultural landscape evolution such 696 as explored in (Sousa & Small, 2016 ET has been shown to be remarkably consistent for rice fields throughout the growing 701 season (Linquist et al, 2015). Indeed, the relative stability of the brightness temperature and area of 702 illuminated photosynthetic vegetation of rice fields are a part of the reason why the joint VSWIR-703 thermal mapping approach is so well suited to rice in particular.…”

Section: Spatiotemporal Characterization 394mentioning

confidence: 99%

Mapping and Monitoring Rice Agriculture with Multisensor Temporal Mixture Models

Sousa¹,

Small²

2018

Preprint

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4Key Points: 5• Novel approach to mapping & monitoring rice agriculture using VSWIR & TIR imagery 6• Veg. abundance (Fv) & brightness temp. (Tb) characterization of CA rice phenology 7• Fv particularly useful for crop timing, Tb for rice/non-rice crop discrimination 8• Data sparse mid-2018 model provides accurate monitoring results in near-realtime 9• Field validation with >1650 km driving transects, > 8500 photos, 380 field spectra 10 Keywords

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“…Hence, the growing steps of Tomatoes will be considered here as a base to determine the optimum system sizing for the PV installation components, which must provide the water volume required for the crops irrigation, by taking into account of the optimal frequency and timing of irrigation, which correspond to a specific irrigation schedule [28]. Indeed, parameters related to the crops are used here to model the water volume needed for the crops irrigation, namely the reference crop evapotranspiration ( o ET ) and the rainfall m r , which can be expected for a given 10-days period [29,30]. In fact, in the literature, many models have been used to describe Tomatoes' evapotranspiration.…”

Section: Water Volume For Tomatoes Irrigationmentioning

confidence: 99%

Sensitivity analysis for photovoltaic water pumping systems: Energetic and economic studies

Yahyaoui

Atieh

Serna

et al. 2017

Energy Conversion and Management

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Water balances and evapotranspiration in water- and dry-seeded rice systems

Cited by 70 publications

References 24 publications

Weed Community Dynamics and System Productivity in Alternative Irrigation Systems in California Rice

Weed Community Dynamics and System Productivity in Alternative Irrigation Systems in California Rice

Mapping and Monitoring Rice Agriculture with Multisensor Temporal Mixture Models

Sensitivity analysis for photovoltaic water pumping systems: Energetic and economic studies

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