<i>Application of deficit irrigation management to variable rate irrigation for winter wheat in sub-arid climates</i>

Maximizing water productivity of winter wheat by managing zones of variable rate irrigation at different deficit levels

Agricultural Water Management ◽

10.1016/j.agwat.2019.02.002 ◽

2019 ◽

Vol 216 ◽

pp. 153-163 ◽

Cited By ~ 7

Author(s):

Xiumei Li ◽

Weixia Zhao ◽

Jiusheng Li ◽

Yanfeng Li

Keyword(s):

Winter Wheat ◽

Water Productivity ◽

Variable Rate ◽

Variable Rate Irrigation

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Variable Rate Irrigation Management for Humid Climates Using a Conventional Center Pivot System

10.13031/2013.35858 ◽

2010 ◽

Author(s):

Allen L Thompson ◽

Kenneth A Sudduth ◽

Joseph C Henggeler ◽

Earl D Vories ◽

Andrew D Rackers

Keyword(s):

Irrigation Management ◽

Variable Rate ◽

Center Pivot ◽

Variable Rate Irrigation

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Variable-rate irrigation management using an expert system in the eastern coastal plain

Irrigation Science ◽

10.1007/s00271-014-0457-x ◽

2015 ◽

Vol 33 (3) ◽

pp. 167-175 ◽

Cited By ~ 13

Author(s):

K. C. Stone ◽

P. J. Bauer ◽

W. J. Busscher ◽

J. A. Millen ◽

D. E. Evans ◽

...

Keyword(s):

Expert System ◽

Coastal Plain ◽

Irrigation Management ◽

Variable Rate ◽

Variable Rate Irrigation

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Crop Yield and Water Productivity Responses in Management Zones for Variable-Rate Irrigation Based on Available Soil Water Holding Capacity

Transactions of the ASABE ◽

10.13031/trans.12340 ◽

2017 ◽

Vol 60 (5) ◽

pp. 1659-1667 ◽

Cited By ~ 3

Author(s):

Weixia Zhao ◽

Jiusheng Li ◽

Rumiao Yang ◽

Yanfeng Li

Keyword(s):

Winter Wheat ◽

Growth Parameters ◽

Water Productivity ◽

Crop Growth ◽

Variable Rate ◽

Summer Maize ◽

Area Index ◽

Management Zones ◽

Water Holding ◽

Variable Rate Irrigation

Abstract. Effective management of variable-rate irrigation (VRI) is a critical factor for maximizing the benefit of a VRI system. In this study, the influences of soil properties on winter wheat and summer maize were studied to verify whether differences in soil available water holding capacity (AWC) had an influence on crop growth parameters, yield, and water productivity (WP). A center-pivot VRI system was employed to deliver irrigation water across the field in an alluvial flood plain in China, and AWC was used to delineate VRI management zones. Three management zones with substantial differences in AWC were created, with AWC varying from 152 to 161 mm, from 161 to 171 mm, and from 171 to 185 mm for zones 1, 2, and 3, respectively. All zones were managed using the same allowed depletion. In the two-year study, the seasonal irrigation amount was basically equivalent among management zones for both winter wheat and summer maize. Differences in crop growth parameters were detected in plant height and leaf area index for winter wheat. The maximum plant height and leaf area index observed in zone 2 were 5 cm and 2.1 greater, respectively, than in the other zones. For both winter wheat and summer maize, the highest yield and WP were observed in zone 2, except for summer maize WP in the 2014 season. Compared with the average value for this field, the yields in zone 2 were 27% and 23% greater for winter wheat and 4% and 11% greater for summer maize in the 2014 and 2015 seasons, respectively. We demonstrate that AWC is an effective parameter for zone identification in VRI management, and differences in AWC and the layered-textural soils in a field may influence the crop growth parameters, yield, and WP of winter wheat and summer maize. Keywords: Center-pivot irrigation, Critical soil moisture deficit, Management zone, Summer maize, Variable-rate irrigation, Winter wheat.

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Potential Water Conservation Using Site-Specific Variable Rate Irrigation

Applied Engineering in Agriculture ◽

10.13031/aea.13108 ◽

2019 ◽

Vol 35 (6) ◽

pp. 881-888

Author(s):

Kenneth C Stone ◽

Philip J Bauer ◽

Gilbert C Sigua

Keyword(s):

Water Conservation ◽

Irrigation Management ◽

Field Capacity ◽

Weather Conditions ◽

Variable Rate ◽

Water Usage ◽

Site Specific ◽

Management Zones ◽

Water Holding ◽

Variable Rate Irrigation

Abstract. Site-specific variable-rate irrigation (VRI) systems can be used to spatially manage irrigation within sub-field-sized zones and optimize spatial water use efficiency. The goal of the research is to provide farmers and consultants a tool to evaluate the potential benefits of implementing VRI. The specific objective of this research is to evaluate the potential water savings using VRI management compared with uniform irrigation management to maintain soil water holding capacity above 50% depletion using two irrigation scenarios: 1) a standard 12.5 mm irrigation per application; and 2) an application to refill the soil profile to field capacity. A 21-year simulation study was carried out on a selected field with varying degrees of soil and topographic variability. The simulated field had 12 soil mapping units with water holding capacities in the top 0.30-m ranging from 42 to 70 mm. The 21-year simulation covering all weather conditions for each soil produced only two significantly different irrigation management zones for scenario 1, and for scenario 2 only one management zone. However, when the 21-year period was divided into periods with different ratios of rainfall to reference evapotranspiration, the simulations identified 1 to 5 management zones with significantly different irrigation requirements. These results indicate that variable rate irrigation system design and management should not be solely based on long term average weather conditions. Years with differing weather conditions should be used for potentially identifying management zones for VRI systems. Irrigation application depths between management zones ranged from 17 to 38 mm. However, when the actual soil areas of the study field were utilized to calculate the total volume of irrigation water applied, it resulted in an increase in water usage in the 2 and 4 management zones ranging from -1.2% to 5.8%. Water usage with VRI over uniform irrigation was greater by -1.6% to 6.8% in the 12.5 mm irrigations and by -1.2% to 2.2% for the field capacity irrigations Keywords: Management zones, Precision farming, Variable-rate irrigation, Water conservation.

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