Abstract
Two field experiments were carried out during 2014/2015 and 2015/2016 seasons at Agric. Exp. Res. Sta. at Giza, Fac. Agric., Cairo Univ. to study the influence of three nitrogen fertilizer levels (75, 100 and 125 kg N/fad.), three seeding rates (200, 300 and 400 grains/m 2 ), on growth of three wheat cultivars . Nitrogen levels had significant effect on heading and plant height in the first season only and on flag leaf area in both seasons. Absolute growth rate (AGR) was significantly affected by N levels at 80 days from sowing. Leaf area index (LAI) was significantly affected by N levels at 80 and 100 days in the second season only. Net assimilation rate (NAR) significantly increased with increasing N levels. In general, all previous characters were increased with increasing N levels up to 125 kg N/fad. Nitrogen use efficiency (NUE) significantly decreased with increasing N levels. Seeding rates had significant effect on LAI at 80 days in the first season and on AGR at 80 in the first season as well as at 80 and 100 days in both seasons, respectively. The highest values for the previous traits were produced with seeding 300 or 400 grains/m 2 . Seeding rates did not affect NAR. Nitrogen use efficiency was not affected by seeding rates. Plant height and heading significantly affected by cultivars. AGR at 80 days in the first season and at 100 days in both seasons significantly affected by cultivars. LAI at 60, 80 and 100 days significantly affected by cultivars. Cultivars significant affected NAR except at 100 days in the first season. Cultivars did not affect NUE. All interactions had a significant effect on growth characters in both seasons, except the effect of N levels seeding rates on flag leaf area, LAI at 60 days, plant height and number of tillers/ m 2 , N levels cultivars on LAI at 60 days, plant height and number of tillers/m 2 , seeding rates cultivars on LAI at 100 days in both seasons, plant height and number of tillers/m 2 in the first season as well as LAI at 80 days in the second one and N levels seeding rates cultivars on flag leaf area, plant height and number of tillers/m 2 in the first season. The overall findings concluded that seeding Gemmiza-9 or Giza-168 with 300 or 400 grains/m 2 and application of 125 kg N/fad., could be more beneficial in the study area. Some interactions had significant effect on NAR. Moreover, none of studied interactions significantly affected NUE.
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Claims 7
Claim · model-written summary
Higher nitrogen rates increased wheat growth traits through 125 kg N/fad.
Not reportedTaxonComparator
Verbatim
e0“In general, all previous characters were increased with increasing N levels up to 125 kg N/fad.”
Claim · model-written summary
Net assimilation rate rose significantly with nitrogen rate.
Not reportedTaxonComparator
Verbatim
e0“Net assimilation rate (NAR) significantly increased with increasing N levels.”
Claim · model-written summary
Nitrogen use efficiency declined significantly as nitrogen rate increased.
Not reportedTaxonComparator
Verbatim
e0“Nitrogen use efficiency (NUE) significantly decreased with increasing N levels.”
Claim · model-written summary
Seeding at 300 or 400 grains/m2 gave the highest values for the affected growth traits.
Not reportedTaxonComparator
Verbatim
e0“The highest values for the previous traits were produced with seeding 300 or 400 grains/m 2 .”
Claim · model-written summary
Seeding rate did not affect net assimilation rate or nitrogen use efficiency.
Not reportedTaxonComparator
Verbatim
e0“Seeding rates did not affect NAR. Nitrogen use efficiency was not affected by seeding rates.”
Claim · model-written summary
Cultivars differed in growth traits, but did not differ in nitrogen use efficiency.
- Outcome
- Plant height and headinge0
Not reportedTaxonDirection
Verbatim
e0“Plant height and heading significantly affected by cultivars. AGR at 80 days in the first season and at 100 days in both seasons significantly affected by cultivars. LAI at 60, 80 and 100 days significantly affected by cultivars. Cultivars significant affected NAR except at 100 days in the first season. Cultivars did not affect NUE.”
Claim · model-written summary
The authors recommend Gemmiza-9 or Giza-168 at 300 or 400 grains/m2 with 125 kg N/fad.
- Taxon
- WHEAT
Triticum aestivumt0 - Outcome
- seeding Gemmiza-9 or Giza-168 with 300 or 400 grains/m 2 and application of 125 kg N/fad.e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seeding Gemmiza-9 or Giza-168 with 300 or 400 grains/m 2 and application of 125 kg N/fad., could be more beneficial in the study area.”
t0“WHEAT CULTIVARS”