Abstract
The effects of humic acid ( HA) and phosphorus ( P) applications on plant growth and nutrient content of lettuce, together with available soil phosphorus remaining after harvest were examined. The amounts of phosphorus used were 0, 120, and 240 kg ha(-1) and those of humic acid were 0, 100, 200, and 300 kg ha(-1). Phosphorus increased the nitrogen content of lettuce significantly (P< 0.01) while the application of humic acid did not have significant effect. Humic acid, phosphorus, and HA x P interaction increased the nitrogen content of lettuce significantly (P< 0.05). All effects were not significant for plant K, Ca, Mg, Fe, Cu, and Mn contents. Application of phosphorus decreased Zn content significantly ( P< 0.05). Increased amount of phosphorus caused significant increases in residual soil phosphorus (P< 0.01). It was concluded that the application of 120 kg ha(-1) of phosphorus together with 300 kg ha(-1) of humic acid was convenient for the head weight of lettuce.
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Claims 7
Claim · model-written summary
Humic acid application did not significantly change lettuce nitrogen content.
- Taxon
- lettuce
Lactuca sativae1 - Treatment
- humic acide1
- Outcome
- nitrogen contente1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Phosphorus increased the nitrogen content of lettuce significantly (P< 0.01) while the application of humic acid did not have significant effect”
Claim · model-written summary
Phosphorus application significantly increased lettuce nitrogen content.
- Taxon
- lettuceLactuca sativae1
- Treatment
- Phosphoruse1
- Outcome
- nitrogen contente1
- Direction
- increasede1
- Qualifier
- P< 0.01e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Phosphorus increased the nitrogen content of lettuce significantly (P< 0.01) while the application of humic acid did not have significant effect”
Claim · model-written summary
Humic acid significantly increased lettuce nitrogen content.
- Taxon
- lettuceLactuca sativae2
- Treatment
- Humic acide2
- Outcome
- nitrogen contente2
- Direction
- increasede2
- Qualifier
- P< 0.05e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Humic acid, phosphorus, and HA x P interaction increased the nitrogen content of lettuce significantly (P< 0.05)”
Claim · model-written summary
The humic acid x phosphorus interaction significantly increased lettuce nitrogen content.
- Taxon
- lettuceLactuca sativae2
- Treatment
- HA x P interactione2
- Outcome
- nitrogen contente2
- Direction
- increasede2
- Qualifier
- P< 0.05e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Humic acid, phosphorus, and HA x P interaction increased the nitrogen content of lettuce significantly (P< 0.05)”
Claim · model-written summary
Phosphorus application significantly decreased lettuce zinc content.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Application of phosphoruse3
- Outcome
- Zn contente3
- Direction
- decreasede3
- Qualifier
- P< 0.05e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of humic acid ( HA) and phosphorus ( P) applications on plant growth and nutrient content of lettuce”
e3“Application of phosphorus decreased Zn content significantly ( P< 0.05)”
Claim · model-written summary
Increased phosphorus amounts significantly increased residual soil phosphorus after lettuce harvest.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Increased amount of phosphoruse4
- Outcome
- residual soil phosphoruse4
- Direction
- increasese4
- Qualifier
- P< 0.01e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lettuce”
e4“Increased amount of phosphorus caused significant increases in residual soil phosphorus (P< 0.01)”
Claim · model-written summary
A combination of 120 kg ha(-1) phosphorus and 300 kg ha(-1) humic acid was suitable for lettuce head weight.
- Taxon
- lettuceLactuca sativae5
- Treatment
- 120 kg ha(-1) of phosphorus together with 300 kg ha(-1) of humic acide5
- Outcome
- head weighte5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“the application of 120 kg ha(-1) of phosphorus together with 300 kg ha(-1) of humic acid was convenient for the head weight of lettuce”
The same questions in other papers
phosphorus · nutrient: content · Lactuca sativa (garden lettuce)Positive and negative results
10 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- negative
11 papers more in this group
See all 15 papers →other · nutrient: content · Lactuca sativa (garden lettuce)Positive and negative results
31 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
32 papers more in this group
See all 36 papers →phosphorus · soil: chemistry · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- positive
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.