Abstract
In potted experiment,the effect of the combined application of N,P and K on yield and quality of lettuce was studied.There was a significant difference in yield among five treatments,which was in the order of N_3P_2K_1N_3P_1K_2N_2P_2K_2N_2P_3K_1N_2P_1K_3.When nitrogen was at the middle level(N_2),there was a reducemect of yield both for higher level of phosphor(P_3) and potassium(K_3).The highest concentration of nitrate in lettuce leaf was found in treatment N_2P_3K_1,and the lowest was in N_3P_1K_2 and N_3P_2K_1.In stem the nitrate concentration was in the order of N_2P_1K_3N_3P_1K_2N_2P_2K_2N_2P_3K_1N_3P_2K_1.Among the three nutrient factors,it was the potassium(K) and the phosphors(P) that could decrease the nitrate concentration in lettuce leaf and decrease the nitrate accumulation in lettuce stem,respectively.There was higher concentration of Vc in leaf of lettuce than stem,but the concentration of reductive sugar and amino acid was higher in the latter than the former.There was an obvious effect of nitrogen,phosphors and potassium combination on the nutrient quality(Vc,reductive sugar and amino acid) in leaf and stem of lettuce.There was a better effect of nutrient combination on the nutrient quality of lettuce in N_3P_2K_1,N_3P_1K_2 and N_2P_2K_2,and the best,in N_3P_1K_2 and N_3P_2K_1 in leaf and stem,respectively. Among five treatments of the combination,the higher yield and better quality for lettuce were obtained in N_3P_2K_1,N_3P_1K_2 and N_2P_2K_2.
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Claims 13
Claim · model-written summary
Yield differed significantly among the five fertilizer treatments in the stated order.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- five treatmentse0
- Outcome
- yielde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a significant difference in yield among five treatments,which was in the order of N_3P_2K_1N_3P_1K_2N_2P_2K_2N_2P_3K_1N_2P_1K_3”
t0“Lettuce”
Claim · model-written summary
At middle nitrogen, higher phosphorus reduced lettuce yield.
- Taxon
- LettuceLactuca sativat0
- Treatment
- higher level of phosphor(P_3)e0
- Outcome
- yielde0
- Direction
- reducemecte0
- Comparator
- middle level(N_2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When nitrogen was at the middle level(N_2),there was a reducemect of yield both for higher level of phosphor(P_3) and potassium(K_3)”
t0“Lettuce”
Claim · model-written summary
At middle nitrogen, higher potassium reduced lettuce yield.
- Taxon
- LettuceLactuca sativat0
- Treatment
- potassium(K_3)e0
- Outcome
- yielde0
- Direction
- reducemecte0
- Comparator
- middle level(N_2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When nitrogen was at the middle level(N_2),there was a reducemect of yield both for higher level of phosphor(P_3) and potassium(K_3)”
t0“Lettuce”
Claim · model-written summary
Leaf nitrate concentration was highest under N_2P_3K_1.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- leafe0
- Treatment
- N_2P_3K_1e0
- Outcome
- concentration of nitratee0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest concentration of nitrate in lettuce leaf was found in treatment N_2P_3K_1”
Claim · model-written summary
Leaf nitrate concentration was lowest under N_3P_1K_2 and N_3P_2K_1.
- Taxon
- LettuceLactuca sativat0
- Treatment
- N_3P_1K_2 and N_3P_2K_1e0
- Outcome
- loweste0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lowest was in N_3P_1K_2 and N_3P_2K_1”
t0“Lettuce”
Claim · model-written summary
Potassium decreased nitrate concentration in lettuce leaf.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- leafe0
- Treatment
- potassium(K)e0
- Outcome
- nitrate concentratione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the potassium(K) and the phosphors(P) that could decrease the nitrate concentration in lettuce leaf and decrease the nitrate accumulation in lettuce stem”
Claim · model-written summary
Phosphorus decreased nitrate accumulation in lettuce stem.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- steme0
- Treatment
- phosphors(P)e0
- Outcome
- nitrate accumulatione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the potassium(K) and the phosphors(P) that could decrease the nitrate concentration in lettuce leaf and decrease the nitrate accumulation in lettuce stem”
Claim · model-written summary
Vitamin C concentration was higher in leaf than stem.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- leafe0
- Outcome
- concentration of Vce0
- Direction
- highere0
- Comparator
- steme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was higher concentration of Vc in leaf of lettuce than stem”
Claim · model-written summary
Reducing sugar and amino acid concentrations were higher in stem than leaf.
- Taxon
- LettuceLactuca sativat0
- Outcome
- concentration of reductive sugar and amino acide0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of reductive sugar and amino acid was higher in the latter than the former”
t0“Lettuce”
Claim · model-written summary
N, P and K combinations affected nutrient quality in leaves and stems.
- Taxon
- lettuceLactuca sativae0
- Treatment
- nitrogen,phosphors and potassium combinatione0
- Outcome
- nutrient quality(Vc,reductive sugar and amino acid)e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was an obvious effect of nitrogen,phosphors and potassium combination on the nutrient quality(Vc,reductive sugar and amino acid) in leaf and stem of lettuce”
Claim · model-written summary
N_3P_1K_2 produced the best leaf nutrient quality.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the best,in N_3P_1K_2 and N_3P_2K_1 in leaf and stem,respectively”
t0“Lettuce”
Claim · model-written summary
N_3P_2K_1 produced the best stem nutrient quality.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the best,in N_3P_1K_2 and N_3P_2K_1 in leaf and stem,respectively”
t0“Lettuce”
Claim · model-written summary
N_3P_2K_1, N_3P_1K_2 and N_2P_2K_2 gave higher yield and better quality.
- Taxon
- lettuceLactuca sativae0
- Treatment
- N_3P_2K_1,N_3P_1K_2 and N_2P_2K_2e0
- Outcome
- higher yield and better qualitye0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the higher yield and better quality for lettuce were obtained in N_3P_2K_1,N_3P_1K_2 and N_2P_2K_2”
The same questions in other papers
potassium · nutrient: content · Lactuca sativa (garden lettuce)Positive and negative results
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- no effect
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See all 10 papers →potassium · yield · Lactuca sativa (garden lettuce)Positive and negative results
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See all 16 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.