Seasonal and inter-annual variability of soil moisture stress function in dryland wheat field, Australia

Akuraju, Venkata Radha; Ryu, Dongryeol; George, Biju; Ryu, Youngryel; Dassanayake, K. B.

doi:10.1016/j.agrformet.2016.10.007

Cited by 36 publications

(15 citation statements)

References 60 publications

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“…The average SMI was lower than 0.4 in most of the stations shown in the top figure. This value is associated with water stress, and long exposure to it can lead to damages in plant development and crop failure [85,86]. Rainfall during the transition in 2015/2016 was atypical in the region when compared with the expected climatology.…”

Section: Case Study 2: Drought Impact Assessment On Smallholder Agricmentioning

confidence: 99%

Extreme Drought Events over Brazil from 2011 to 2019

et al. 2019

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Drought-related disasters are among the natural disasters that are able to cause large economic and social losses. In recent years, droughts have affected different regions of Brazil, impacting water, food, and energy security. In this study, we used the Integrated Drought Index (IDI), which combines a meteorological-based drought index and remote sensing-based index, to assess the drought events from 2011 to 2019 over Brazil. During this period, drought events were observed throughout the country, being most severe and widespread between the years 2011 and 2017. In most of the country, the 2014/15 hydrological year stands out due to the higher occurrence of severe and moderate droughts. However, drought intensity and observed impacts were different for each region, which is shown by the different case studies, assessing different types of impacts caused by drought in Brazil. Thus, it is fundamental to evaluate the impacts of droughts in a continental country such as Brazil, where a variety of vegetation, soil, land use, and especially different climate regimes predominate.

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Section: Case Study 2: Drought Impact Assessment On Smallholder Agricmentioning

confidence: 99%

Extreme Drought Events over Brazil from 2011 to 2019

et al. 2019

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“…It should be noted that this value is an approximation of typical thresholds observed in experimental studies for maize and can be different for other crops and drought resistant varieties. During water stress conditions, the ratio of transpiration to potential evapotranspiration (T/PET) starts to decrease linearly in response to decreasing values of SMI [22,23,25,51]. Water becomes a limiting factor to plant transpiration, affecting several aspects of plant growth depending on its stage, including leaf formation and grain yield [52,53].…”

Section: Index Of Stress In Agriculturementioning

confidence: 99%

Tools for Communicating Agricultural Drought over the Brazilian Semiarid Using the Soil Moisture Index

Zeri

Alvalá

Carneiro

et al. 2018

Water

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Soil moisture over the Brazilian semiarid region is presented in different visualizations that highlight spatial, temporal and short-term agricultural risk. The analysis used the Soil Moisture Index (SMI), which is based on a normalization of soil moisture by field capacity and wilting point. The index was used to characterize the actual soil moisture conditions into categories from severe drought to very wet. In addition, the temporal evolution of SMI was implemented to visualize recent trends in short-term drought and response to rainfall events at daily time steps, as new data are available. Finally, a visualization of drought risk was developed by considering a critical value of SMI (assumed as 0.4), below which water stress is expected to be triggered in plants. A novel index based on continuous exposure to critical SMI was developed to help bring awareness of real time risk of water stress over the region: the Index of Stress in Agriculture (ISA). The index was tested during a drought over the region and successfully identified locations under water stress for periods of three days or more. The monitoring tools presented here help to describe the real time conditions of drought over the region using daily observations. The information from those tools support decisions on agricultural management such as planting dates, triggering of irrigation, or harvesting.

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“…After performing some transformations, we get: This equation was derived based on Mohr's theory of strength, according to which the fracture of the formation occurs in the plane, where the action of the normal and tangent creates a stress equal to the net shear, i.e. each time the shear angle is set such that the shear (cleavage) force is minimal, the value of which depends on soil moisture [12][13][14][15].…”

Section: Fig 4 Scheme Of Deformation Of the Treated Medium By The Wmentioning

confidence: 99%

Substantiation of the parameters of an innovative working body for shallow tillage

et al. 2020

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The purpose of study: determine the rational parameters of an innovative working body that carries out a high-quality technological process of shallow soil cultivation. An innovative working body for shallow soil cultivation was developed on the basis of nature-like technologies that are currently relevant in scientific research. The ratio when using the golden ratio arises when comparing curvilinear and rectilinear, i.e. natural and artificial forms. The development of a new working body design is based on the physics of the interaction process with the processed environment, using analogies of shape and optimal proportions existing in nature. The working body design for shallow tillage with curved surfaces of increased streamlining using the configuration of natural sliding lines of the treated medium layer during cultivation has been developed. Depending on the required processing depth (6-16 cm), the innovative working body efficiently performs the cutting process with sliding, and also performs flat-cut loosening. Rational parameters and functioning modes of an innovative working body for shallow tillage have been obtained: length – 305 mm; working width – 450 mm; angle of crumbling, sharpening, posterior occipital cutting, mortar, rise – 15, 12, 10, 75-110, 10 degrees respectively; speed – 9-12 km/h.

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Seasonal and inter-annual variability of soil moisture stress function in dryland wheat field, Australia

Cited by 36 publications

References 60 publications

Extreme Drought Events over Brazil from 2011 to 2019

Extreme Drought Events over Brazil from 2011 to 2019

Tools for Communicating Agricultural Drought over the Brazilian Semiarid Using the Soil Moisture Index

Substantiation of the parameters of an innovative working body for shallow tillage

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