Abstract
Taking different genotype cotton varieties as test materials, a soil column culture experiment was conducted to study the effects of water and nitrogen management modes on the photosynthetic characters and yield formation of cotton with under-mulch drip irrigation in Xinjiang, Northwest China. Under the management mode W4N2, i.e., pre-sowing irrigation + limited drip irrigation before full-flowering + abundant drip irrigation after full-flowering in combining with basal 20% N + topdressing 80% N, the chlorophyll content, net photosynthetic rate (Pn), stomatal conductance (gs) , actual photochemical efficiency of photosystem II (Psi PSII), and photochemical quenching coefficient (qp) at full-flowering stage all decreased significantly, the non-photochemical quenching (NPQ) increased, and the aboveground dry matter accumulation was inhibited, as compared with those under common drip irrigation. From full-flowering stage to boll-opening stage, the chlorophyll content, gs, Pn, Psi PSII, and qp increased with increasing water and nitrogen supply, and the aboveground dry matter accumulation was enhanced by compensation, which benefited the translocation and distribution of photosynthates to seed cotton. Under the fertilization mode of basal 20% N + topdressing 80% N, the seed cotton yield of Xinluzaol3 was the highest in treatment pre-sowing irrigation + common drip irrigation (W3), but that of Xinluzao43 was the highest in treatment pre-sowing irrigation + limited drip irrigation before full-flowering + abundant drip irrigation after full-flowering (W4). It was concluded that under the condition of pre-sowing irrigation, to appropriately decrease the water and nitrogen supply before full-flowering stage and increase the water and nitrogen supply at middle and late growth stages could extend the active photosynthesis duration and promote the photosynthates allocation to reproductive organ, which would fully exploit the yield-increasing potential of cotton with under-mulch drip irrigation.
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Claims 9
Claim · model-written summary
W4N2 significantly decreased chlorophyll content, Pn, gs, PSII efficiency and qp at full flowering versus common drip irrigation.
- Taxon
- cotton
Gossypium hirsutumt0 - Organ / stage
- full-flowering stagee0
- Treatment
- management mode W4N2e0
- Outcome
- chlorophyll content, net photosynthetic rate (Pn), stomatal conductance (gs) , actual photochemical efficiency of photosystem II (Psi PSII), and photochemical quenching coefficient (qp)e0
- Direction
- decreasede0
- Comparator
- common drip irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the management mode W4N2, i.e., pre-sowing irrigation + limited drip irrigation before full-flowering + abundant drip irrigation after full-flowering in combining with basal 20% N + topdressing 80% N, the chlorophyll content, net photosynthetic rate (Pn), stomatal conductance (gs) , actual photochemical efficiency of photosystem II (Psi PSII), and photochemical quenching coefficient (qp) at full-flowering stage all decreased significantly, the non-photochemical quenching (NPQ) increased, and the aboveground dry matter accumulation was inhibited, as compared with those under common drip irrigation.”
t0“cotton”
Claim · model-written summary
W4N2 increased NPQ at full flowering relative to common drip irrigation.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- management mode W4N2e1
- Outcome
- non-photochemical quenching (NPQ)e0
- Direction
- increasede0
- Comparator
- common drip irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the non-photochemical quenching (NPQ) increased, and the aboveground dry matter accumulation was inhibited, as compared with those under common drip irrigation.”
e1“Under the management mode W4N2”
t0“cotton”
Claim · model-written summary
W4N2 inhibited aboveground dry matter accumulation versus common drip irrigation.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- management mode W4N2e1
- Outcome
- aboveground dry matter accumulatione0
- Direction
- inhibitede0
- Comparator
- common drip irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the aboveground dry matter accumulation was inhibited, as compared with those under common drip irrigation.”
e1“Under the management mode W4N2”
t0“cotton”
Claim · model-written summary
From full flowering to boll opening, chlorophyll content, gs, Pn, PSII efficiency and qp rose with increasing water and nitrogen supply.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- full-flowering stage to boll-opening stagee0
- Treatment
- increasing water and nitrogen supplye0
- Outcome
- chlorophyll content, gs, Pn, Psi PSII, and qpe0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“From full-flowering stage to boll-opening stage, the chlorophyll content, gs, Pn, Psi PSII, and qp increased with increasing water and nitrogen supply”
t0“cotton”
Claim · model-written summary
Increasing water and nitrogen supply enhanced aboveground dry matter accumulation by compensation.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- increasing water and nitrogen supplye1
- Outcome
- aboveground dry matter accumulatione0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the aboveground dry matter accumulation was enhanced by compensation, which benefited the translocation and distribution of photosynthates to seed cotton.”
e1“increasing water and nitrogen supply”
t0“cotton”
Claim · model-written summary
Compensatory accumulation benefited photosynthate movement to seed cotton.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- translocation and distribution of photosynthates to seed cottone0
- Qualifier
- enhanced by compensatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the aboveground dry matter accumulation was enhanced by compensation, which benefited the translocation and distribution of photosynthates to seed cotton.”
Claim · model-written summary
For Xinluzaol3, seed cotton yield was highest under W3 with basal 20% N and topdressing 80% N.
- Taxon
- cottonGossypium hirsutume0
- Material
- Xinluzaol3e0
- Treatment
- pre-sowing irrigation + common drip irrigation (W3)e0
- Outcome
- seed cotton yielde0
- Direction
- higheste0
- Qualifier
- basal 20% N + topdressing 80% Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the fertilization mode of basal 20% N + topdressing 80% N, the seed cotton yield of Xinluzaol3 was the highest in treatment pre-sowing irrigation + common drip irrigation (W3)”
Claim · model-written summary
For Xinluzao43, seed cotton yield was highest under W4 with basal 20% N and topdressing 80% N.
- Taxon
- cottonGossypium hirsutume0
- Material
- Xinluzao43e0
- Treatment
- pre-sowing irrigation + limited drip irrigation before full-flowering + abundant drip irrigation after full-flowering (W4)e0
- Outcome
- seed cotton yielde0
- Direction
- higheste0
- Qualifier
- basal 20% N + topdressing 80% Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the fertilization mode of basal 20% N + topdressing 80% N, the seed cotton yield of Xinluzaol3 was the highest in treatment pre-sowing irrigation + common drip irrigation (W3), but that of Xinluzao43 was the highest in treatment pre-sowing irrigation + limited drip irrigation before full-flowering + abundant drip irrigation after full-flowering (W4).”
Claim · model-written summary
The authors recommend reducing early water and nitrogen supply and increasing middle and late supply to extend photosynthesis and promote reproductive allocation.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- decrease the water and nitrogen supply before full-flowering stage and increase the water and nitrogen supply at middle and late growth stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“to appropriately decrease the water and nitrogen supply before full-flowering stage and increase the water and nitrogen supply at middle and late growth stages could extend the active photosynthesis duration and promote the photosynthates allocation to reproductive organ, which would fully exploit the yield-increasing potential of cotton with under-mulch drip irrigation.”