Abstract
Vegetative and reproductive growth of cotton ( Gossypium hirsutum L.) were evaluated in the greenhouse on media containing nitrate or ammonium or both, to test for interactions between the two N sources on growth and yield. An inhibitor of nitrification was included in all treatments. Both N sources supported vegetative growth, although there was little response to increments of nitrate above meq/liter under the conditions of the test. Combinations of the two N sources did not support better growth than either one alone, except at low total N levels, perhaps because ammonium at ≥ 2 meq/liter inhibited in vivo nitrate reductase activity. Reproductive growth of the plants was enhanced by N; however, 9 meq/liter nitrate was less effective than lower concentrations of either source, or their combination, in promoting fruitfulness and N accumulation relative to the vegetative parts. The failure to find a synergistic interaction in response to the two sources suggests that cotton responds to N source differently from some other crop species.
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Claims 7
Claim · model-written summary
Both nitrate and ammonium supported cotton vegetative growth.
- Taxon
- cotton
Gossypium hirsutume1 - Outcome
- vegetative growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both N sources supported vegetative growth”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Cotton vegetative growth responded little to additional nitrate above the stated threshold.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- increments of nitratee0
- Outcome
- response to increments of nitratee0
- Direction
- little responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was little response to increments of nitrate above meq/liter under the conditions of the test”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Combined nitrate and ammonium did not improve growth over either source alone except at low total N.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- Combinations of the two N sourcese0
- Outcome
- growthe0
- Direction
- did not support bettere0
- Qualifier
- except at low total N levelse0
- Comparator
- either one alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combinations of the two N sources did not support better growth than either one alone, except at low total N levels”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
The authors suggest ammonium at ≥ 2 meq/liter inhibited nitrate reductase activity in cotton.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- ammonium at ≥ 2 meq/litere0
- Gene
- nitrate reductasee0
- Outcome
- in vivo nitrate reductase activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“perhaps because ammonium at ≥ 2 meq/liter inhibited in vivo nitrate reductase activity”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Nitrogen enhanced reproductive growth of cotton.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- Ne0
- Outcome
- Reproductive growthe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reproductive growth of the plants was enhanced by N”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Nitrate at 9 meq/liter was less effective than lower concentrations or combinations for cotton fruitfulness.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- 9 meq/liter nitratee0
- Outcome
- fruitfulnesse0
- Direction
- less effectivee0
- Comparator
- lower concentrations of either source, or their combinatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“9 meq/liter nitrate was less effective than lower concentrations of either source, or their combination, in promoting fruitfulness and N accumulation relative to the vegetative parts”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Nitrate at 9 meq/liter was less effective for N accumulation relative to vegetative parts.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- 9 meq/liter nitratee0
- Outcome
- N accumulation relative to the vegetative partse0
- Direction
- less effectivee0
- Comparator
- lower concentrations of either source, or their combinatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“9 meq/liter nitrate was less effective than lower concentrations of either source, or their combination, in promoting fruitfulness and N accumulation relative to the vegetative parts”
e1“cotton ( Gossypium hirsutum L.)”
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See all 79 papers →nitrogen · growth · Gossypium hirsutum (cotton)Positive and negative results
128 papers in the same direction as this paper · 21 in the opposite direction · 3 reporting no difference from an alternative
- negative
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See all 153 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.