Spatio-temporal variability of global crop water requirement, during 1950-2020

2021 ◽  
Author(s):  
Matteo Rolle ◽  
Stefania Tamea ◽  
Pierluigi Claps
Keyword(s):  
Climate Change ◽  
Temporal Variability ◽  
Large Scale ◽  
Water Requirement ◽  
Crop Water Requirement ◽  
Green Water ◽  
Crop Water ◽  
Main Challenge ◽  
Spatio Temporal ◽  
Climate Forcings

<p>Intensification of studies of the agricultural water requirement is a main challenge in a globalized world, where food production is pushed to meet the needs of a growing population and the international trade network requires large-scale planning policies. Agriculture is the human activity that consumes most of the withdrawn freshwater and climate change can greatly influence the amount of irrigation required by crops. In recent years, the widespread availability of satellite images is providing an important contribution to water resources management, offering data at high spatio-temporal resolution over an interestingly long period of time.</p><p>This study deals with the temporal variability of global water requirement of the main crops, which is assessed through a comprehensive model, driven by climate forcings, that estimates the daily crop water requirement on a spatial resolution of 5 arc-min (or 0.0833°) from 1950 to 2020. The model computes a soil water balance using daily input data of precipitation and evapotranspiration, based on the high-resolution ERA5 reanalysis dataset from the Climate Change Service of the Copernicus Program, which combines satellite information and ground measurements. The distribution of harvested areas and the length of crop development phases are kept constant, to analyze the variability of crop water requirement strictly related to climate forcings, both in terms of precipitation (green water) and irrigation (blue water). The model considers the separation between irrigated and rainfed areas, in order to provide a consistent spatial distribution of irrigation requirements. Examining the spatio-temporal variability of the crop water requirement can support considerations on the effects of global warming in different areas in the world.</p>

Spatio-temporal variability of evapotranspiration and crop water requirement from space

2018 ◽  
Vol 567 ◽  
pp. 732-742 ◽  
Author(s):  
Alexander Samuel ◽  
Atkilt Girma ◽  
Amanuel Zenebe ◽  
Tesfaalem Ghebreyohannes
Keyword(s):  
Temporal Variability ◽  
Water Requirement ◽  
Crop Water Requirement ◽  
Crop Water ◽  
Spatio Temporal

scholarly journals Spatiotemporal Analysis of Maize Water Requirement in the Heilongjiang Province of China during 1960–2015

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2472 ◽  
Author(s):  
Tianyi Wang ◽  
Chong Du ◽  
Tangzhe Nie ◽  
Zhongyi Sun ◽  
Shijiang Zhu ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Deficit ◽  
Temporal Variations ◽  
Essential Elements ◽  
Water Requirement ◽  
Crop Water Requirement ◽  
Eastern Region ◽  
Heilongjiang Province ◽  
Security Assessment ◽  
Crop Water

Climate change will have a significant effect on crop water requirement (ETc). The spatial and temporal variations of water requirement of maize under climate change are essential elements when conducting a global water security assessment. In this paper, annual reference crop evapotranspiration (ET0) and the crop water requirement of maize were calculated by the single crop coefficient method. The crop water surplus deficit index (CWSDI) and coupling degree of ETc and effective precipitation (Pe) were calculated to analyze the relationship between ETc, ET0, and Pe. The result shows that maize average annual ET0, ETc, and precipitation were 552.97, 383.05, and 264.97 mm, respectively. Moreover, ET0, ETc, and Pe decreased by 3.28, 2.56, and 6.25 mm every decade from 1960 to 2015. The ETc decreased less than Pe did, which led to the decreasing of both CWSDI and the coupling degree of ETc and Pe. The tendency of ET0, ETc decreased first and then increased, while Pe and CWSDI increased first and then decreased, from west to east of the Heilongjiang Province. In addition, the highest ET0, ETc, and lowest CWSDI and Pe were found in the western part of Heilongjiang Province. This study indicated that even though the water deficit in the western region was alleviated and the water deficit in the eastern region grew gradually serious from 1960 to 2015, the drought situation in western Heilongjiang Province should still be taken seriously.

scholarly journals Strategies for climate change impacts on irrigated crops in National Capital Region of India

2015 ◽  
Vol 7 (1) ◽  
pp. 388-393
Author(s):  
J. B. Kambale ◽  
D. K. Singh ◽  
A. Sarangi
Keyword(s):  
Climate Change ◽  
Cropping System ◽  
Water Requirement ◽  
Crop Water Requirement ◽  
Climatic Parameters ◽  
Crop Water ◽  
Groundwater Availability ◽  
National Capital ◽  
Irrigated Crops ◽  
Change Impact

Irrigation has helped in increasing food production and achieving food security in India. However, climate change is expected to affect the crop production in irrigated area particularly in groundwater irrigated areas. This study was undertaken for suggesting strategies to climate change impact on irrigated crops based on projected change in crop water requirement and groundwater availability for irrigation in the National Capital Territory of Delhi. Prevailing groundwater recharge in the study area during monsoon was 4.01 MCM (Million cubic meter). The same for various scenarios varied from -15.47 MCM to 5.08 MCM. It was revealed that groundwater recharge would increase if it is estimated based on the climate prediction done using local weather data. The impact of climate change on groundwater availability is evident in scenarios based on INCCA and IPCC predictions where it varied from -2.66 MCM to 1.02 MCM. Contrary to common perceptions, crop water requirement of prevailing cropping system would not increase in future if all the important climatic parameters are considered for its prediction. This may be due to the fact that effect of increase in temperature on crop water requirement may be compensated by decrease in other climatic parameters such wind speed and duration of daily sunshine hours. Results indicated that climate change may not have much impact on sustainability of prevailing cropping system as per the crop water requirement is concerned. Based on water requirement and groundwater availability under various climate change scenarios, appropriate strategies to cope up the climate change impact on irrigated crops have been suggested.

scholarly journals IMPACT OF CLIMATIC PARAMETERS ON CROP WATER REQUIREMENTS IN DIFFERENT AGRO ECOLOGICAL ZONES OF PAKISTAN

2020 ◽  
Vol 4 (1) ◽  
pp. 21-24
Author(s):  
Imran Shaukat ◽  
Hafiz Ihsan -ul-Haq ◽  
Hafiz M. Safdar ◽  
Rao Husnain Arshad
Keyword(s):  
Climate Change ◽  
Climate Changes ◽  
Global Scale ◽  
Water Requirement ◽  
Crop Water Requirement ◽  
Climatic Parameters ◽  
Crop Water ◽  
Ecological Zones ◽  
Anthropogenic Processes ◽  
Agro Ecological Zones

The problem of climate change has become very strongly during last two decades on global scale in view of the projected consequences on the environment of unguarded states. Gradually rising temperature and its effects on the crops here and rainfall are obvious in many areas around the world. Climate change related to natural and anthropogenic processes in Pakistan is the major source of study in this report. The impacts of these climate changes appear to be additional component of the large number of existing water related problems in every station of Pakistan. The objective of this report is to analyze the global warming effect on CWR. For this purpose, we made seven scenarios So, S1, S2, S3, S4, S5 and S6. From So-S3 crop water requirement increases in all regions but from S4-S6 crop water requirement remains same. For this purpose we selected different cities from agro ecological stations to check the effect of climate change on CWR. Faisalabad, Gupis, Jacobabad, Kalat, Karachi, Multan, Nawabshah, Peshawar and Zhob are the regions selected for this research. Different scenarios have been made such that, in So scenario temperature remains same but from S1, S2 and S3 scenarios temperature is increases 1, 2 and 3 degree centigrade respectively. While, in S4, S5 and S6 scenarios precipitation increases or decreases according to the climatic changes of that area (So, S1, S2, S3, ) and then we increase or decrease the precipitation rate by 5%, 10% and 15% (S4, S5, S6) in accordance with the zone. From result it is concluded that the crop water requirement in arid and in semi-arid is increasing annually on the other hand the total value of effective rainfall in Pakistan is decreasing.

scholarly journals REVIEW OF THE RESEARCH IN CROP WATER REQUIREMENT AND ITS USE IN THE REPUBLIC OF MACEDONIA

2017 ◽  
Vol 37 (1) ◽  
Author(s):  
Ordan Chukaliev
Keyword(s):  
Climate Change ◽  
Field Experiments ◽  
Water Requirement ◽  
Crop Water Requirement ◽  
Crop Water ◽  
Data Intensive ◽  
Biophysical Models ◽  
Republic Of Macedonia ◽  
Research Activities ◽  
The Republic

The paper presents a review of the research activities dealing with evapotranspiration (ET), crop water re-quirement (CWR) and the use of these parameters in other research, particularly in climate change. The first part dis-cusses the development of these research methodologies globally. Later the achievements of the national research are discussed. Macedonia did not developed capacities for measuring of the ET and the crop water requirement. There is only one practice which is followed – field experiments for the assessment of the water balance with bucket approach. The estimation of evapotranspiration is based mainly on the Penman – Monteith FAO 56 procedure. Due to the lack of input data the less data intensive Thornthwhaite methodology is applied. In the country the ET and the crop water requirement are used in irrigation projects, in research activities and in the assessment of the effects of water limita-tion on crop yield, particularly in climate change. Recently some activities dealing with the use of crop biophysical models WOFOST and CropSyst are taken.

scholarly journals Climate Change Effect on Irrigation Water Requirement of Wheat and Maize in Northern Part of Bangladesh

2021 ◽  
Vol 5 (1) ◽  
pp. 25-34
Author(s):  
Md Panjarul Haque ◽  
Md Zakir Hossain ◽  
Muhammad Ahsan Ali
Keyword(s):  
Climate Change ◽  
Water Management ◽  
Irrigation Water ◽  
Water Requirement ◽  
Crop Water Requirement ◽  
Crop Water ◽  
Irrigation Water Requirement ◽  
Irrigation Water Use ◽  
Change Effect ◽  
Climate Change Effect

Bangladesh is one of the most vulnerable countries for climate change in agricultural water management. A research had been done to assess climate change effects on irrigation water use of wheat and maize in the northern part of Bangladesh. The twenty nine years of data (1990-2018) were analyzed with Mann-Kendall test as well as Sen’s slope for climate change impact and the responsible weather parameters due to climate change were identified with correlation coefficients. The crop water requirement of wheat in Bogura and Rangpur was declining at the rate of 3.3mm and 2.3mm per decade respectively. Net irrigation water requirement of wheat at both Bogura and Rangpur was inclining at the rate of 1mm and 10mm per decade respectively because the effective rainfall of these regions was decreasing at 5mm and 11mm per decade respectively. The crop water requirement of maize for similar districts was increasing at the rate of 3.2mm and 2.5mm per decade respectively although net irrigation water requirement had statistically non-significance for climate change effect. The weather parameter, which was mainly responsible for climatic change in irrigation water requirement, was increasing temperature. Therefore, wheat cultivation might be coped with climate change in the northern part of Bangladesh rather than maize on the basis of irrigation and water management.

Spatio-temporal Variability and Climate Change Impact on the Crop Water Requirement of Pigeonpea (Cajanus cajan) - A Case Study, North-Eastern Karnataka, India

2020 ◽  
Author(s):  
Siddharam . ◽  
J.B. Kambale ◽  
M. Nemichandrappa ◽  
A.T. Dandekar ◽  
D. Basavaraja
Keyword(s):  
Climate Change ◽  
Water Conservation ◽  
Rainwater Harvesting ◽  
Water Requirement ◽  
Crop Water Requirement ◽  
Yield Reduction ◽  
Climate Change Scenarios ◽  
Crop Water ◽  
Ground Water Recharge ◽  
Increasing Trend

Background: Global climate change and its impact on crop water requirement have widely discussed in recent years. In the present century, climate change had become a significant concern and atmospheric temperature is the dominant climatic factor that indicates the changes in both regional and global scales. This study was undertaken to evaluate the trend and predict the changes in crop water requirement under various climate change scenarios. Methods: The statistical nonparametric Mann-Kendall test and Sen’s slope used to identify trend in the data series. In this study ArcGIS V. xx software used for investigating spatial patterns in data. CROPWAT-8.0 model used for calculation of crop water requirement under various climate change scenarios. Total six climate change scenarios were considered for assessment.Result: The crop water requirement (ETc) of pigeonpea estimated and exhibited an increasing trend and a decreasing trend in study area in the past 35 years. The spatial distribution maps reveal that the distribution of ETc is found an increasing trend in all the scenarios to reference ETc. An increasing trend of ETc of pigeon pea was observed in all the places under various climate change scenarios. It was suggested to promote rainwater harvesting, soil and water conservation and increase ground water recharge in the study area to minimize the risk of yield reduction due to the availability of minimum water under changing climatic condition.

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