Abstract
Both nitrogen supply and planting date affect plant development, yield and other characteristics of cotton. To obtain this type of information the response of Giza 75 cotton variety to N fertilization ( 0, 20, 40, 60, and 80 N unit / fed. ) and planting dates (15thMarch, 1stApril, 15th April and 1st May ) were studied at the Agric. Exp. and Res. Cent. Fac. Agric. Cairo Univ. during 1995 and 1996 seasons. The main findings of this study can be summarized as follows: sowing date and nitrogen level had significant effects on plant height in different growth stages in the two seasons. Generally delaying sowing date led to significant decrease in plant height Like-wise increasing nitrogen levels resulted in increasing plant height. Sowing date had insignificant effects on LAI at the three growth stages studied ( 8-leaves, first flower and first open boll). However, increasing nitrogen fertilization more than 40 N unit/fed. induced significant increase in LAI. Delaying sowing date, led to significant decrease in the total dry matter (TDM). Increasing the applied nitrogen level, increased significantly the average (TDM ). In general there was a gradual increase in DM partition in terms of recovered roots, leaves and stems with late planting . However , late planting induced significant reduction in DM. partition in terms of the fruiting parts of its (buds, flowers and bolls) and in estimates of earliness criteria (1stflower and 1st open boll ) . Cotton yields and only one yield component variable viz.: number of bolls per plant and earliness index expressed significant variation in the favour of the earlier sowing dates viz.: 15th March and 1st April , with no significant differences between those two dates in most instances . All yield components except number of bolls per plant and standability at harvest were not significantly affected by variation in levels of N fertilizations used. Averaged over the levels of the other factor, both successively latter planting dates and nitrogen levels exhibited insignificant variations in all fiber properties, indicating that these traits are highly inherited traits and low effected with variability in the environment.
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Claims 13
Claim · model-written summary
Delayed sowing significantly decreased cotton height.
- Taxon
- COTTON
Gossypium hirsutumt0 - Treatment
- delaying sowing datee0
- Outcome
- plant heighte0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“delaying sowing date led to significant decrease in plant height”
t0“COTTON GROWTH PARAMETERS”
Claim · model-written summary
Increasing nitrogen increased cotton height.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- increasing nitrogen levelse0
- Outcome
- plant heighte0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing nitrogen levels resulted in increasing plant height”
t0“COTTON GROWTH PARAMETERS”
Claim · model-written summary
Sowing date had no significant effect on leaf area index at the three stages.
- Taxon
- COTTONGossypium hirsutumt0
- Organ / stage
- 8-leaves, first flower and first open bolle0
- Treatment
- Sowing datee0
- Outcome
- LAIe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sowing date had insignificant effects on LAI at the three growth stages studied ( 8-leaves, first flower and first open boll)”
t0“COTTON GROWTH PARAMETERS”
Claim · model-written summary
Nitrogen above 40 units significantly increased leaf area index.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- increasing nitrogen fertilization more than 40 N unit/fed.e0
- Outcome
- LAIe0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing nitrogen fertilization more than 40 N unit/fed. induced significant increase in LAI”
t0“COTTON GROWTH PARAMETERS”
Claim · model-written summary
Delayed sowing significantly decreased total dry matter.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- Delaying sowing datee0
- Outcome
- total dry matter (TDM)e0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delaying sowing date, led to significant decrease in the total dry matter (TDM)”
t0“COTTON GROWTH PARAMETERS”
Claim · model-written summary
Increasing nitrogen significantly increased average total dry matter.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- Increasing the applied nitrogen levele0
- Outcome
- average (TDM )e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the applied nitrogen level, increased significantly the average (TDM )”
t0“COTTON GROWTH PARAMETERS”
Claim · model-written summary
Late planting increased dry matter partition to roots, leaves and stems.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- late plantinge0
- Outcome
- DM partition in terms of recovered roots, leaves and stemse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“gradual increase in DM partition in terms of recovered roots, leaves and stems with late planting”
t0“COTTON GROWTH PARAMETERS”
Claim · model-written summary
Late planting reduced dry matter partition to fruiting parts.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- late plantinge0
- Outcome
- DM. partition in terms of the fruiting parts of its (buds, flowers and bolls)e0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late planting induced significant reduction in DM. partition in terms of the fruiting parts of its (buds, flowers and bolls)”
t0“COTTON GROWTH PARAMETERS”
Claim · model-written summary
Late planting significantly reduced estimates of earliness.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- late plantinge0
- Outcome
- estimates of earliness criteria (1stflower and 1st open boll )e0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late planting induced significant reduction in DM. partition in terms of the fruiting parts of its (buds, flowers and bolls) and in estimates of earliness criteria (1stflower and 1st open boll )”
t0“COTTON GROWTH PARAMETERS”
Claim · model-written summary
Earlier sowing dates favored cotton yields.
- Taxon
- CottonGossypium hirsutume0
- Treatment
- earlier sowing dates viz.: 15th March and 1st Aprile0
- Outcome
- Cotton yieldse0
- Direction
- in the favour ofe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton yields and only one yield component variable viz.: number of bolls per plant and earliness index expressed significant variation in the favour of the earlier sowing dates viz.: 15th March and 1st April”
Claim · model-written summary
Earlier sowing dates favored boll number and earliness index.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- earlier sowing dates viz.: 15th March and 1st Aprile0
- Outcome
- number of bolls per plant and earliness indexe0
- Direction
- in the favour ofe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“number of bolls per plant and earliness index expressed significant variation in the favour of the earlier sowing dates viz.: 15th March and 1st April”
t0“COTTON GROWTH PARAMETERS”
Claim · model-written summary
Most yield components were not significantly affected by nitrogen level.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- variation in levels of N fertilizationse0
- Outcome
- All yield components except number of bolls per plant and standability at harveste0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All yield components except number of bolls per plant and standability at harvest were not significantly affected by variation in levels of N fertilizations used”
t0“COTTON GROWTH PARAMETERS”
Claim · model-written summary
Planting date and nitrogen level did not significantly alter fibre properties.
- Taxon
- COTTONGossypium hirsutumt0
- Treatment
- successively latter planting dates and nitrogen levelse0
- Outcome
- all fiber propertiese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both successively latter planting dates and nitrogen levels exhibited insignificant variations in all fiber properties”
t0“COTTON GROWTH PARAMETERS”
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