Abstract
This experiment was set up to understand the mechanisms causing yield limitations on crops subjected to water deficiency. The units were set out as a randomized complete block design with a split-plot arrangement with 4 repetitions at Azad Islamic University Research Center-Varamin-Pishva during the growing seasons of 2008 and 2009. The main factors tested drought stress at four stages (50, 100, 150 and 200 mm evaporation from the evaporation pan) and the sub factors were applications of nitrogen fertilizer at 3 levels (80,130,180 kg/ha). The experiment demonstrated that with increasing severity of drought stress, grain yield decreased sharply but increased with nitrogen fertilizer, the time taken for pollination, grain weight and total number of grains/ear were also affected. Results for plant height and diameter of first internode and total number of leaves above the ear (201.8 cm) were most affected by nitrogen fertilizer application of 180 kg/ha and 50 mm evaporation. Proline also increased significantly under drought stress conditions showing that osmotic adjustment mechanism had been activated. The highest level of leaf proline (180.2 µmol/g NT) was achieved with 200 mm evaporation and 80 kg/ha of nitrogen fertilizer. Grain protein content was undesirably affected under extreme drought stress and fertilizer treatment.
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Claims 7
Claim · model-written summary
Grain yield fell sharply with increasing drought severity.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- drought stresse0
- Outcome
- grain yielde0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with increasing severity of drought stress, grain yield decreased sharply”
t0“Corn Seed (Zea mays L.)”
Claim · model-written summary
Grain yield increased with nitrogen fertilizer.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- nitrogen fertilizere0
- Outcome
- grain yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yield decreased sharply but increased with nitrogen fertilizer”
t0“Corn Seed (Zea mays L.)”
Claim · model-written summary
Nitrogen fertilizer and drought affected time to pollination, grain weight and grains per ear.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- nitrogen fertilizere1
- Outcome
- time taken for pollination, grain weight and total number of grains/eare0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the time taken for pollination, grain weight and total number of grains/ear were also affected”
e1“with increasing severity of drought stress, grain yield decreased sharply but increased with nitrogen fertilizer”
t0“Corn Seed (Zea mays L.)”
Claim · model-written summary
Plant height, first internode diameter and leaves above the ear were most affected at 180 kg/ha nitrogen and 50 mm evaporation.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- nitrogen fertilizer application of 180 kg/ha and 50 mm evaporatione0
- Outcome
- plant height and diameter of first internode and total number of leaves above the eare0
- Qualifier
- 201.8 cme0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant height and diameter of first internode and total number of leaves above the ear (201.8 cm) were most affected by nitrogen fertilizer application of 180 kg/ha and 50 mm evaporation”
t0“Corn Seed (Zea mays L.)”
Claim · model-written summary
Proline increased significantly under drought stress.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- drought stress conditionse0
- Outcome
- Prolinee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proline also increased significantly under drought stress conditions”
t0“Corn Seed (Zea mays L.)”
Claim · model-written summary
Highest leaf proline was 180.2 µmol/g NT at 200 mm evaporation and 80 kg/ha nitrogen.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- 200 mm evaporation and 80 kg/ha of nitrogen fertilizere0
- Outcome
- leaf prolinee0
- Direction
- higheste0
- Value
- 180.2 µmol/g NTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest level of leaf proline (180.2 µmol/g NT) was achieved with 200 mm evaporation and 80 kg/ha of nitrogen fertilizer.”
t0“Corn Seed (Zea mays L.)”
Claim · model-written summary
Extreme drought and fertilizer adversely affected grain protein content.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- extreme drought stress and fertilizer treatmente0
- Outcome
- Grain protein contente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain protein content was undesirably affected under extreme drought stress and fertilizer treatment.”
t0“Corn Seed (Zea mays L.)”
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See all 3,908 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.