Abstract
Under-mulch-drip irrigation is an advanced irrigation technique, which combines plastic-film-covered cultivation with drip irrigation. The influence of different norms of under-mulch-drip irrigation on di-urnal changes of photosynthetic rates and chlorophyll fluorescence parameters of cotton was studied, in orderto understand the physiological mechanisms of water-saving and high-yielding farming in Xinjiang. Results in-dicated that limited drip irrigation, which supplies 2/3 of 375 m3 ha-1 , the widely-used irrigation norm in cot-ton cultivation in Xinjiang, caused a water deficit in cotton field. Compared with the proper drip irrigation,the leaf photosynthetic rate under limited drip irrigation decreased during 9:00 to 11:00 a. m., and was sig-nificantly suppressed at midday, and then recovered afterwards. Using the chlorophyll fluorescence method,the absorption, transfer and transformation features of solar radiation by cotton leaf were investigated. Underlimited drip irrigation, the variable fluorescence (Fy) and primary light transfer efficiency of PSII (Fv/Fm)in cotton leaves were reduced because of the high light intensities and high temperatures at noon, and the de-crease in Xinluzao8 was greater than that in Xinluzao6. Therefore, it could be concluded that Xinluzao6 has ahigher drought-tolerance, and the Fv/Fm ratio could be used as a drought-resistance index for cotton.
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Claims 6
Claim · model-written summary
Limited drip irrigation caused a water deficit in the cotton field.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- limited drip irrigatione0
- Outcome
- water deficit in cotton fielde0
- Comparator
- 375 m3 ha-1e0
- Setting
- Xinjiange0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limited drip irrigation, which supplies 2/3 of 375 m3 ha-1 , the widely-used irrigation norm in cot-ton cultivation in Xinjiang, caused a water deficit in cotton field”
Claim · model-written summary
Limited irrigation reduced leaf photosynthesis during 9:00 to 11:00 a. m. and suppressed it at midday, with later recovery.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- limited drip irrigatione0
- Outcome
- leaf photosynthetic ratee0
- Direction
- decreasede0
- Qualifier
- 9:00 to 11:00 a. m.e0
- Comparator
- proper drip irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the proper drip irrigation,the leaf photosynthetic rate under limited drip irrigation decreased during 9:00 to 11:00 a. m., and was sig-nificantly suppressed at midday, and then recovered afterwards”
t0“Cotton”
Claim · model-written summary
Limited irrigation reduced cotton leaf variable fluorescence and PSII primary light transfer efficiency at noon.
- Taxon
- cottonGossypium hirsutume0
- Organ / stage
- leavese0
- Treatment
- limited drip irrigatione0
- Outcome
- variable fluorescence (Fy) and primary light transfer efficiency of PSII (Fv/Fm)e0
- Direction
- reducede0
- Qualifier
- high light intensities and high temperatures at noone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under limited drip irrigation, the variable fluorescence (Fy) and primary light transfer efficiency of PSII (Fv/Fm)in cotton leaves were reduced because of the high light intensities and high temperatures at noon”
Claim · model-written summary
The fluorescence decrease was greater in Xinluzao8 than Xinluzao6.
- Taxon
- CottonGossypium hirsutumt0
- Material
- Xinluzao8e0
- Outcome
- de-creasee0
- Direction
- greatere0
- Comparator
- Xinluzao6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the de-crease in Xinluzao8 was greater than that in Xinluzao6”
t0“Cotton”
Claim · model-written summary
Xinluzao6 was concluded to have higher drought tolerance.
- Taxon
- CottonGossypium hirsutumt0
- Material
- Xinluzao6e0
- Outcome
- drought-tolerancee0
- Direction
- ahighere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xinluzao6 has ahigher drought-tolerance”
t0“Cotton”
Claim · model-written summary
The Fv/Fm ratio could serve as a cotton drought-resistance index.
- Taxon
- cottonGossypium hirsutume0
- Gene
- Fv/Fme0
- Outcome
- drought-resistance indexe0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Fv/Fm ratio could be used as a drought-resistance index for cotton”
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