Abstract
Abstract Field experiments were conducted during 1980‐82 at the Agronomy Farm of the University of California, Davis, to compare fermentable carbohydrate production and cost of potential ethanol from fodderbeet, sweet sorghum, sugarbeet, and corn in relation to the requirements of these crops for fertilizer nitrogen and irrigation. The response of hexose yields of these crops to fertilizer N varied in the two experiments. When all crops responded, sweet sorghum and sugarbeet required 36 % and fodderbeet 68 % of the fertilizer N needed for corn. Twelve weeks following a mid‐season irrigation cut off, hexose yield of sugarbeet was decreased by 18 % as compared to an adequately watered crop. Water stressed sweet sorghum extracted higher amounts of soil moisture, increased in hexose concentration and produced 29 % higher hexose yield than when adequately watered. Stressed sugarbeet, however, had a higher hexose yield due to its higher sugar concentration. When fertilized and irrigated adequately, fodderbeet produced 13.4, sugarbeet 11.9, sweet sorghum 10.0, and corn 8.15 Mg hexose ha −1 . Comparative on‐farm ethanol production costs of these four crops were very close ($0.38 to 0.40 L −1 ). Thus, growing established crops like corn and sugarbeet for which processing facilities and alternative markets already exist would be preferred.
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Claims 14
Claim · model-written summary
Sweet sorghum required 36% as much fertilizer N as corn when crops responded.
Verbatim
e0“sweet sorghum and sugarbeet required 36 % and fodderbeet 68 % of the fertilizer N needed for corn”
Claim · model-written summary
Sugarbeet required 36% as much fertilizer N as corn.
- Taxon
- sugarbeet
Beta vulgaris subsp. vulgarise0 - Outcome
- fertilizer Ne0
- Value
- 36 %e0
- Comparator
- corne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sweet sorghum and sugarbeet required 36 % and fodderbeet 68 % of the fertilizer N needed for corn”
Claim · model-written summary
Fodderbeet required 68% as much fertilizer N as corn.
Verbatim
e0“fodderbeet 68 % of the fertilizer N needed for corn”
Claim · model-written summary
Irrigation cutoff reduced sugarbeet hexose yield by 18%.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarise0
- Treatment
- mid‐season irrigation cut offe0
- Outcome
- hexose yielde0
- Direction
- decreasede0
- Value
- 18 %e0
- Comparator
- adequately watered crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Twelve weeks following a mid‐season irrigation cut off, hexose yield of sugarbeet was decreased by 18 % as compared to an adequately watered crop”
Claim · model-written summary
Water stressed sweet sorghum extracted more soil moisture.
Not reportedComparator
Verbatim
e0“Water stressed sweet sorghum extracted higher amounts of soil moisture”
Claim · model-written summary
Water stressed sweet sorghum had higher hexose concentration.
Not reportedComparator
Verbatim
e0“Water stressed sweet sorghum extracted higher amounts of soil moisture, increased in hexose concentration”
Claim · model-written summary
Water stressed sweet sorghum produced 29% more hexose yield than adequately watered plants.
Verbatim
e0“produced 29 % higher hexose yield than when adequately watered”
e1“Water stressed sweet sorghum”
t0“Sweet Sorghum”
Claim · model-written summary
Stressed sugarbeet had higher hexose yield attributed to higher sugar concentration.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarise0
- Outcome
- hexose yielde0
- Direction
- highere0
- Qualifier
- higher sugar concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stressed sugarbeet, however, had a higher hexose yield due to its higher sugar concentration”
Claim · model-written summary
Adequately fertilized and irrigated fodderbeet yielded 13.4 Mg hexose per ha.
Verbatim
e0“fodderbeet produced 13.4, sugarbeet 11.9, sweet sorghum 10.0, and corn 8.15 Mg hexose ha −1”
Claim · model-written summary
Adequately fertilized and irrigated sugarbeet yielded 11.9 Mg hexose per ha.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarise0
- Outcome
- hexosee0
- Value
- 11.9e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fodderbeet produced 13.4, sugarbeet 11.9, sweet sorghum 10.0, and corn 8.15 Mg hexose ha −1”
Claim · model-written summary
Adequately fertilized and irrigated sweet sorghum yielded 10.0 Mg hexose per ha.
Verbatim
e0“fodderbeet produced 13.4, sugarbeet 11.9, sweet sorghum 10.0, and corn 8.15 Mg hexose ha −1”
Claim · model-written summary
Adequately fertilized and irrigated corn yielded 8.15 Mg hexose per ha.
- Taxon
- corn
Zea mays subsp. mayse0 - Outcome
- hexosee0
- Value
- 8.15 Mg hexose ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fodderbeet produced 13.4, sugarbeet 11.9, sweet sorghum 10.0, and corn 8.15 Mg hexose ha −1”
Claim · model-written summary
The four crops had similar on farm ethanol production costs of $0.38 to 0.40 per L.
Verbatim
e0“Comparative on‐farm ethanol production costs of these four crops were very close ($0.38 to 0.40 L −1 )”
t0“Corn, Sweet Sorghum, Fodderbeet, and Sugarbeet”
Claim · model-written summary
Authors preferred growing established crops such as corn and sugarbeet for ethanol.
- Taxon
- corn and sugarbeetBeta vulgaris subsp. vulgarisZea mays subsp. mayse0
- Outcome
- growing established crops like corn and sugarbeete0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growing established crops like corn and sugarbeet for which processing facilities and alternative markets already exist would be preferred”
The same questions in other papers
drought · yield · SorghumResults differ
7 papers in the same direction as this paper · 47 in the opposite direction
- no effect
- negative
- negative
51 papers more in this group
See all 55 papers →irrigation · yield · Beta vulgaris (beet)Results differ
33 papers in the same direction as this paper · 79 in the opposite direction
- positive
- positive
- positive
109 papers more in this group
See all 113 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.