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Evapotranspiration irrigation

Nabil El Jaouhari, Aziz Abouabdillah, Rachid Bouabid, Mohamed Bourioug, Lotfi Aleya, Mohamed Chaoui
This study was conducted over three consecutive years, 2015, 2016 and 2017, in the Imouzzer Kander region located in northwestern Morocco. The main objective is to evaluate apple tree responses to two sustainable deficit irrigation strategies with 75% (T2) and 50% (T3) of calculated crop evapotranspiration (ETc), compared to a control irrigated with 100% ETc (T1). During the three experiment years, estimated reference evapotranspiration (ET0 ) was 630, 684 and 728 mm, respectively, in 2015, 2016 and 2017...
June 14, 2018: Science of the Total Environment
Christopher E Ndehedehe, Onuwa Okwuashi, Vagner G Ferreira, Nathan O Agutu
Monitoring changes in evapotranspiration (ET) is useful in the management of water resources in irrigated agricultural landscapes and in the assessment of crop stress and vegetation conditions of drought-vulnerable regions. Information on the impacts of climate variability on ET dynamics is profitable in developing water management adaptation strategies. Such impacts, however, are generally unreported and not conclusively determined in some regions. In this study, changes in MODIS (Moderate Resolution Imaging Spectroradiometer)-derived ET (2000-2014) over large proportions of Sub-Sahara Africa (SSA) are explored...
June 14, 2018: Environmental Monitoring and Assessment
Ning Jin, Wei Ren, Bo Tao, Liang He, Qingfu Ren, Shiqing Li, Qiang Yu
The Loess Plateau, the largest arid and semi-arid zone in China, has been confronted with more severe water resource pressure and a growing demand for food production under global changes. For developing sustainable agriculture in this region, it is critical to learn spatiotemporal variations in water use efficiency (WUE) of main crops (e.g. winter wheat in this region) under various water management practices. In this study, we classified irrigated and rainfed wheat areas based on MODIS data, and calculated the winter wheat yield by using an improved light use efficiency model...
June 7, 2018: Science of the Total Environment
Álvaro López-Bernal, Alejandro Morales, Omar García-Tejera, Luca Testi, Francisco Orgaz, J P De Melo-Abreu, Francisco J Villalobos
Several simulation models of the olive crop have been formulated so far, but none of them is capable of analyzing the impact of environmental conditions and management practices on water relations, growth and productivity under both well-irrigated and water-limiting irrigation strategies. This paper presents and tests OliveCan, a process-oriented model conceived for those purposes. In short, OliveCan is composed of three main model components simulating the principal elements of the water and carbon balances of olive orchards and the impacts of some management operations...
2018: Frontiers in Plant Science
Flannery C Dolan, Tzahi Y Cath, Terri S Hogue
The Colorado Water Plan estimates as much as 0.8 million irrigated acres may dry up statewide from agricultural to municipal and industrial transfers. To help mitigate this loss, new sources of water are being explored in Colorado. One such source may be produced water. Oil and gas production in 2016 alone produced over 300 million barrels of produced water. Currently, the most common method of disposal of produced water is deep well injection, which is costly and has been shown to cause induced seismicity...
June 1, 2018: Science of the Total Environment
Pradeep Wagle, Prasanna H Gowda, Jerry E Moorhead, Gary W Marek, David K Brauer
Net ecosystem exchange (NEE) of carbon dioxide (CO2 ) and water vapor (H2 O) fluxes from irrigated grain sorghum (Sorghum bicolor L. Moench) and maize (Zea mays L.) fields in the Texas High Plains were quantified using the eddy covariance (EC) technique during 2014-2016 growing seasons and examined in terms of relevant controlling climatic variables. Eddy covariance measured evapotranspiration (ETEC ) was also compared against lysimeter measured ET (ETLys ). Daily peak (7-day averages) NEE reached approximately -12 g C m-2 for sorghum and -14...
May 8, 2018: Science of the Total Environment
Jingyuan Xue, Zailin Huo, Fengxin Wang, Shaozhong Kang, Guanhua Huang
Water scarcity and salt stress are two main limitations for agricultural production. Groundwater evapotranspiration (ETg ) with upward salt movement plays an important role in crop water use and water productivity in arid regions, and it can compensate the impact of deficit irrigation on crop production. Thus, comprehensive impacts of shallow groundwater and deficit irrigation on crop water use results in an improvement of irrigation water productivity (IWP). However, it is difficult to quantify the effects of groundwater and deficit irrigation on IWP...
April 1, 2018: Science of the Total Environment
Getahun Legesse, Marcos R C Cordeiro, Kim H Ominski, Karen A Beauchemin, Roland Kroebel, Emma J McGeough, Sarah Pogue, Tim A McAllister
The amount of beef produced per animal in Canada increased significantly from 1981 to 2011, due to enhanced production efficiency and increased carcass weight. This study examined the impact of improvements in production efficiency on water use intensity over this period. Temporal and regional differences in cattle categories, water use for drinking, feed production and meat processing, feeding systems, average daily gains, and carcass weight were considered in the analysis. Potential evapotranspiration (PET) was estimated by the National Drought Model (NDM) from 679 weather stations across Canada using the Priestley and Taylor equation...
April 1, 2018: Science of the Total Environment
Kun Hao, Xiao Gang Liu, Yan Zhang, Zhi Hui Han, Ning Yu, Qi Liang Yang, Yan Wei Liu
The effects of periodic rewatering after drought stress and nitrogen fertilizer on growth, yield, photosynthetic characteristics of leaves and water and nitrogen productivity of Coffea arabica (Katim P7963) were studied under different nitrogen application levels in 2.5 consecutive years. Irrigation (periodic rewatering after drought stress) and nitrogen were designed as two factors, with four modes of irrigation, namely, full irrigation (IF-F : 100%ET0 +100%ET0 , ET0 was reference crop evapotranspiration), rewatering after light drought stress (IL-F : 80%ET0 +100%ET0 ), rewatering after moderate drought stress (IM-F : 60%ET0 +100%ET0 ) and rewatering after severe drought stress (IS-F : 40%ET0 +100%ET0 ), and three levels of nitrogen, namely, high nitrogen (NH : 750 kg N·hm-2 each time), middle nitrogen (NM : 500 kg N·hm-2 each time), low nitrogen (NL : 250 kg N·hm-2 each time), and nitrogen was equally applied for 4 times...
December 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Mustafa Goodarzi, Jahangir Abedi-Koupai, Manouchehr Heidarpour
In this study, the impacts of climate change on crop water requirements and irrigation water requirements on the regional cropping pattern were evaluated using two climate change scenarios and combinations of 20 GCM models. Different models including CROPWAT, MODFLOW, and statistical models were used to evaluate the climate change impacts. The results showed that in the future period (2017 to 2046) the temperature in all months of the year will increase at all stations. The average annual precipitation decline in Isfahan, Tiran, Flavarjan, and Lenj stations for RCP 4...
April 15, 2018: Ground Water
Manuela Girotto, Gabriëlle J M De Lannoy, Rolf H Reichle, Matthew Rodell, Clara Draper, Soumendra N Bhanja, Abhijit Mukherjee
This study investigates some of the benefits and drawbacks of assimilating Terrestrial Water Storage (TWS) observations from the Gravity Recovery and Climate Experiment (GRACE) into a land surface model over India. GRACE observes TWS depletion associated with anthropogenic groundwater extraction in northwest India. The model, however, does not represent anthropogenic groundwater withdrawals and is not skillful in reproducing the interannual variability of groundwater. Assimilation of GRACE TWS introduces long-term trends and improves the interannual variability in groundwater...
May 16, 2017: Geophysical Research Letters
Xuexin Xu, Yinghua Zhang, Jinpeng Li, Meng Zhang, Xiaonan Zhou, Shunli Zhou, Zhimin Wang
Improving winter wheat grain yield and water use efficiency (WUE) with minimum irrigation is very important for ensuring agricultural and ecological sustainability in the Northern China Plain (NCP). A three-year field experiment was conducted to determine how single irrigation can improve grain yield and WUE by manipulating the "sink-source" relationships. To achieve this, no-irrigation after sowing (W0) as a control, and five single irrigation treatments after sowing (75 mm of each irrigation) were established...
2018: PloS One
Alice Ruckert, L Niel Allen, Ricardo A Ramirez
Spider mites, a cosmopolitan pest of agricultural and landscape plants, thrive under hot and dry conditions, which could become more frequent and extreme due to climate change. Recent work has shown that neonicotinoids, a widely used class of systemic insecticides that have come under scrutiny for non-target effects, can elevate spider mite populations. Both water-stress and neonicotinoids independently alter plant resistance against herbivores. Yet, the interaction between these two factors on spider mites is unclear, particularly for Banks grass mite (Oligonychus pratensis; BGM)...
2018: PloS One
Mariem Saâdi, Adel Zghibi, Sabri Kanzari
In semi-arid areas like the Kairouan region, salinization has become an increasing concern because of the constant irrigation with saline water and over use of groundwater resources, soils, and aquifers. In this study, a methodology has been developed to evaluate groundwater contamination risk based on the unsaturated zone hydraulic properties. Two soil profiles with different ranges of salinity, one located in the north of the plain and another one in the south of plain (each 30 m deep) and both characterized by direct recharge of the aquifer, were chosen...
February 24, 2018: Environmental Monitoring and Assessment
Abdulaziz R Al-Harbi, Abdulrasoul M Al-Omran, Khadiga Alharbi
Water scarcity is a major limiting factor for crop productivity in arid and semi-arid areas. Grafting elite commercial cultivars onto selected vigorous rootstocks is considered as a useful strategy to alleviate the impact of environmental stresses. This study aims to investigate the feasibility of using grafting to improve fruit yield and quality of cucumber under water stress conditions. Alosama F1 cucumber cultivar ( Cucumis sativus L.) was grafted onto Affyne ( Cucumis sativus L.) and Shintoza A90 ( Cucurbitamaxima × C...
February 2018: Saudi Journal of Biological Sciences
Di Zhang, Ruiqi Li, William D Batchelor, Hui Ju, Yanming Li
The North China Plain is one of the most important grain production regions in China, but is facing serious water shortages. To achieve a balance between water use and the need for food self-sufficiency, new water efficient irrigation strategies need to be developed that balance water use with farmer net return. The Crop Environment Resource Synthesis Wheat (CERES-Wheat model) was calibrated and evaluated with two years of data which consisted of 3-4 irrigation treatments, and the model was used to investigate long-term winter wheat productivity and water use from irrigation management in the North China Plain...
2018: PloS One
Yan-Lun Ju, Min Liu, Ting-Yao Tu, Xian-Fang Zhao, Xiao-Feng Yue, Jun-Xiang Zhang, Yu-Lin Fang, Jiang-Fei Meng
The effect of regulated deficit irrigation (RDI) on fatty acids and their derived volatiles in 'Cabernet Sauvignon' grapes and wines was investigated during two growing seasons in the east foot of Mt. Helan, the semi-arid area. The vines received water with 60% (RDI-1), 70% (RDI-2), 80% (RDI-3), 100% (CK, traditional drip irrigation) of their estimated evapotranspiration (ETc) respectively. RDI treatments resulted in lower yield, berry weight and titratable acidity with higher total soluble solids. RDI-1 increased the content of unsaturated fatty acids in berries and decreased the level of alcohols and esters volatiles in wines...
April 15, 2018: Food Chemistry
Guang Yang, Lianqing Xue, Xinlin He, Cui Wang, Aihua Long
Widespread application of water-saving measures, especially advanced drip irrigation technologies, may significantly impact on the land use, and further potentially alter regional ecological environments in an arid area. In this study, the remote sensing and geographic information system technology were used to analyze the LANDSAT images (1976-2015) and the MOD16 evapotranspiration data (2000-2015) in the Manas River Basin (MRB), China where the water-saving technologies have experienced the past 40 years. Our results show that the area of the cultivated land was approximately doubled from 1976 to 2015 with a dynamic degree of cultivated land ranging from 1...
December 19, 2017: Scientific Reports
O De Giglio, G Caggiano, F Apollonio, A Marzella, S Brigida, E Ranieri, L Lucentini, V F Uricchio, M T Montagna
In most regions of the world, safeguarding groundwater resources is a serious issue, particularly in coastal areas where groundwater is the main water source for drinking, irrigation and industry. Water availability depends on climate, topography and geology. The aim of this paper is to evaluate aquifer recharge as a possible strategy to relieve water resource scarcity. Natural aquifer recharge is defined as the downward flow of water reaching the water table, increasing the groundwater reservoir. Hydro-meteorological factors (rainfall, evapotranspiration and runoff) may alter natural recharge processes...
January 2018: Annali di Igiene: Medicina Preventiva e di Comunità
Marina Cano-Lamadrid, Alejandro Galindo, Jacinta Collado-González, Pedro Rodríguez, Zulma N Cruz, Pilar Legua, Francisco Burló, Donaldo Morales, Ángel A Carbonell-Barrachina, Francisca Hernández
BACKGROUND: The working hypothesis of the present study was that, by proper simultaneous control of irrigation (hydroSOStainable products) and crop load (thinning), it is possible to promote the accumulation of bioactive compounds and improve fruit appearance (size and weight). The effects of (i) irrigation status [T0, 120% ETc (estimated crop evapotranspiration); T1, 60% ETc during fruit growth and ripening] and (ii) crop load (A0, no thinning; A1, thinning) on yield and fruit quality were evaluated in two pomegranate cultivars (Wonderful, Wond and Mollar de Elche, ME)...
December 6, 2017: Journal of the Science of Food and Agriculture
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