Abstract
SUMMARY Two field experiments with cotton were conducted over two growing seasons on calcareous, heavy to medium textured, alluvial soils, to study the influence of N and P fertilizer rates, the method of fertilizer placement and the time of N fertilizer application on cotton yield, product quality and fertilizer utilization. Nitrogen application up to 50 kg/ha in the first experiment and up to 120 kg/ha in the second experiment increased seed cotton yield; higher nitrogen rates in the first experiment had an adverse effect on seed production due to abnormal rainfall which caused an intense vegetative growth and delayed the time of maturity. Split application of N at sowing and at early flowering was slightly superior to a single application at sowing or to split applications at sowing, early flowering and initiation of fruiting. Addition of nitrogen during the flowering stage failed to influence cotton production significantly. Banding P and N fertilizers increased plant height significantly, compared with the broadcasting method; placement methods, however, did not significantly affect seed yield. Increasing amounts of N and P fertilizers had essentially no effect on lint quality. The phosphate concentrations in the tops derived from fertilizer phosphate, were low ranging from 1–2 to 2–4 % of the P concentration in the tops and it was not affected by the different treatments. The utilization coefficients of the nitrogen fertilizer sources by cotton were high, nitrate N being utilized much more efficiently than ammonium N.
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Claims 12
Claim · model-written summary
Nitrogen up to 50 kg/ha increased seed cotton yield in the first experiment.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- Nitrogen application up to 50 kg/hae0
- Outcome
- seed cotton yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen application up to 50 kg/ha in the first experiment and up to 120 kg/ha in the second experiment increased seed cotton yield”
Claim · model-written summary
Nitrogen up to 120 kg/ha increased seed cotton yield in the second experiment.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- up to 120 kg/hae0
- Outcome
- seed cotton yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen application up to 50 kg/ha in the first experiment and up to 120 kg/ha in the second experiment increased seed cotton yield”
Claim · model-written summary
Higher nitrogen rates in the first experiment harmed seed production.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- higher nitrogen ratese0
- Outcome
- seed productione0
- Direction
- adverse effecte0
- Qualifier
- abnormal rainfalle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher nitrogen rates in the first experiment had an adverse effect on seed production due to abnormal rainfall which caused an intense vegetative growth and delayed the time of maturity”
t0“cotton”
Claim · model-written summary
Two nitrogen applications were slightly superior to a single or three applications.
- Treatment
- Split application of N at sowing and at early floweringe0
- Outcome
- slightly superiore0
- Direction
- slightly superiore0
- Comparator
- single application at sowinge0
Not reportedTaxon
Verbatim
e0“Split application of N at sowing and at early flowering was slightly superior to a single application at sowing or to split applications at sowing, early flowering and initiation of fruiting”
t0“cotton”
Claim · model-written summary
Flowering stage nitrogen did not significantly influence cotton production.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- Addition of nitrogen during the flowering stagee0
- Outcome
- cotton productione0
- Direction
- failed to influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of nitrogen during the flowering stage failed to influence cotton production significantly”
Claim · model-written summary
Banding phosphorus and nitrogen significantly increased plant height versus broadcasting.
- Treatment
- Banding P and N fertilizerse0
- Outcome
- plant heighte0
- Direction
- increasede0
- Comparator
- broadcasting methode0
Not reportedTaxon
Verbatim
e0“Banding P and N fertilizers increased plant height significantly, compared with the broadcasting method”
t0“cotton”
Claim · model-written summary
Placement methods did not significantly affect seed yield.
Not reportedTaxonComparator
Verbatim
e0“placement methods, however, did not significantly affect seed yield”
t0“cotton”
Claim · model-written summary
Increasing N and P had essentially no effect on lint quality.
Not reportedTaxonComparator
Verbatim
e0“Increasing amounts of N and P fertilizers had essentially no effect on lint quality”
t0“cotton”
Claim · model-written summary
Fertilizer-derived phosphate in tops was low, at 1–2 to 2–4% of total top phosphorus.
Not reportedTaxon
Verbatim
e0“The phosphate concentrations in the tops derived from fertilizer phosphate, were low ranging from 1–2 to 2–4 % of the P concentration in the tops”
t0“cotton”
Claim · model-written summary
Treatments did not alter fertilizer-derived phosphate concentration in tops.
Not reportedTaxonComparator
Verbatim
e0“it was not affected by the different treatments”
t0“cotton”
e1“The phosphate concentrations in the tops derived from fertilizer phosphate, were low ranging from 1–2 to 2–4 % of the P concentration in the tops and it was not affected by the different treatments”
Claim · model-written summary
Cotton utilized nitrogen fertilizer sources at high rates.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- utilization coefficients of the nitrogen fertilizer sourcese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The utilization coefficients of the nitrogen fertilizer sources by cotton were high”
Claim · model-written summary
Nitrate nitrogen was used more efficiently than ammonium nitrogen.
Not reportedTaxon
Verbatim
e0“nitrate N being utilized much more efficiently than ammonium N”
t0“cotton”
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See all 343 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.