Abstract
Efficient cropping systems emphasize the importance of both water use efficiency (WUE) and nitrogen use efficiency (NUE). One method of increasing WUE and NUE is to implement low-volume irrigation practices. Sugar beet, a resilient crop with a multitude of economical uses, is grown primarily using conventional flood irrigation but has demonstrated improved resource efficiency when grown under drip irrigation. A two-year study (2015-2017) was conducted at two different field sites located in the Central Valley of California and characterized by clay loam (Site A) and sandy loam (Site B) soils. The experimental design was a split-plot with three replications of irrigation regime as the main treatment (Drip 100% of ETc, Drip 70% of ETc, and Flood 100% of ETc) and nitrogen (N) rate as the sub-treatment (0, 112, 168, and 224 kg N ha-1). Best management practices were evaluated based on yield, sucrose yield, above ground biomass (AGB), relative crop water stress index (rCWSI), WUE, and NUE. At both sites, root yields of sugar beets were similar for the 100% drip and flood irrigated treatments. Production under deficit drip (70% of ETc) regimes resulted in the greatest WUE for AGB, yield, and sucrose yield. Sugar beet yields were not significantly influenced by N rates. However, fertilization at the lowest N rate (112 kg N ha????) led to the highest NUE for AGB, yield, sucrose yield, and sucrose production. When assessing NUE based on both total available soil N and applied N, the NUE for sucrose yield showed a generally strong correlation (r2 ??? 0.74) to total available soil N at both sites. This study is the first investigation of sugar beets cultivated in the spring under deficit drip irrigation in California.
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Claims 6
Claim · model-written summary
Root yields of sugar beets under 100% drip irrigation were similar to flood irrigation.
- Taxon
- sugar beets
Beta vulgaris subsp. vulgarise2 - Treatment
- 100% dripe2
- Outcome
- root yieldse2
- Direction
- similare2
- Comparator
- flood irrigated treatmentse2
- Setting
- Central Valley of Californiae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“At both sites, root yields of sugar beets were similar for the 100% drip and flood irrigated treatments”
e1“conducted at two different field sites located in the Central Valley of California”
Claim · model-written summary
Deficit drip irrigation at 70% of ETc gave the greatest WUE for AGB, yield and sucrose yield.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise2
- Treatment
- deficit drip (70% of ETc)e3
- Outcome
- WUEe3
- Direction
- greateste3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Production under deficit drip (70% of ETc) regimes resulted in the greatest WUE for AGB, yield, and sucrose yield”
e2“At both sites, root yields of sugar beets were similar for the 100% drip and flood irrigated treatments”
Claim · model-written summary
Sugar beet yields were not significantly influenced by N rates.
- Taxon
- Sugar beetBeta vulgaris subsp. vulgarise4
- Treatment
- N ratese4
- Outcome
- yieldse4
- Direction
- not significantly influencede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Sugar beet yields were not significantly influenced by N rates”
Claim · model-written summary
Fertilization at the lowest N rate (112 kg N ha????) gave the highest NUE for AGB, yield and sucrose yield.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise2
- Treatment
- fertilization at the lowest N ratee5
- Outcome
- NUE for AGB, yield, sucrose yielde5
- Direction
- higheste5
- Value
- 112 kg N ha????e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“fertilization at the lowest N rate (112 kg N ha????) led to the highest NUE for AGB, yield, sucrose yield, and sucrose production”
e2“At both sites, root yields of sugar beets were similar for the 100% drip and flood irrigated treatments”
Claim · model-written summary
Fertilization at the lowest N rate (112 kg N ha????) gave the highest NUE for sucrose production.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise2
- Treatment
- fertilization at the lowest N ratee5
- Outcome
- sucrose productione5
- Direction
- higheste5
- Value
- 112 kg N ha????e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“fertilization at the lowest N rate (112 kg N ha????) led to the highest NUE for AGB, yield, sucrose yield, and sucrose production”
e2“At both sites, root yields of sugar beets were similar for the 100% drip and flood irrigated treatments”
Claim · model-written summary
NUE for sucrose yield showed a generally strong correlation to total available soil N at both sites.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise2
- Treatment
- total available soil Ne6
- Outcome
- NUE for sucrose yielde6
- Value
- r2 ??? 0.74e6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“the NUE for sucrose yield showed a generally strong correlation (r2 ??? 0.74) to total available soil N at both sites”
e2“At both sites, root yields of sugar beets were similar for the 100% drip and flood irrigated treatments”
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