NDLI: Evaluating deficit irrigation management strategies for grain sorghum using AquaCrop

Content Provider	Springer Nature Link
Author	Araya, A. Kisekka, Isaya Holman, Johnathon
Copyright Year	2016
Abstract	Many wells in the US Central Plains can no longer meet full crop water requirements due to declines in Ogallala aquifer water levels. A study was conducted in Southwest Kansas to determine optimum limited irrigation strategies for grain sorghum. Objectives were to (1) calibrate and validate the AquaCrop model, (2) apply AquaCrop to assess the effect of varying climate, planting dates, and soil types on yield, and (3) evaluate water productivities and optimal irrigation needs. Experimental data of grain sorghum were used to calibrate and validate AquaCrop. Planting date was found to substantially affect biomass and grain yield, and hence, considerably affect water productivities. The highest grain water productivities were obtained with late planting in a wet season. Late planting was associated with lower irrigation requirements. Depending on local conditions, we recommend planting to occur between June 1st and June 10th. Grain sorghum yield was optimized on sandy soils of southwestern Kansas with irrigation of 100–275 mm for early, 150–275 mm for normal and 100–275 mm for late planting. The optimal irrigation on silt loam soils for the corresponding planting dates were 175–350, 175–250 and 125–250 mm, respectively, with the lowest and highest in the range being for the wet and dry climate season conditions. Fluctuations in grain sorghum prices had a substantial impact on economic water productivity. Overall planting grain sorghum under optimum conditions combined with deficit irrigation improved water productivity.
Starting Page	465
Ending Page	481
Page Count	17
File Format	PDF
ISSN	03427188
Journal	Irrigation Science
Volume Number	34
Issue Number	6
e-ISSN	14321319
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-07-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Agriculture Water Industry/Water Technologies Environment Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Sustainable Development Climate Change
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Water Science and Technology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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