Abstract
High rates of nitrogen fertilization dangerously increase the nitrate content of vegetable crops, and the accumulation of nitrate in edible crops is undesirable because of potential risks to human health. Micronutrient solution containing Cu, Mn, Mo, Zn was tested for the suppression of nitrate accumulation in lettuce grown in pots treated with Mg fertilizer under a greenhouse condition. The micronutrient solution was sprayed on leaves at 3 and 4 weeks after transplanting of 20-day old seedlings. Plants were harvested after 5-week growth, and yield, contents of chlorophyll, sugar, micronutrient and nitrate, and also nitrate reductase activity were measured. Fresh weight of lettuce was significantly increased by the application of Mg and micronutrients, and the effect was the most significant in the Mg+micronutrient treatment. Also contents of chlorophyll and micronutrients were higher in the plants of micronutrient treatments. Contents of nitrate were reduced by about 14-18% in lettuce with Mg and/or micronutrient applications. Compared to the plants of control treatment, nitrate reductase activity was also higher in those plants treated with micronutrients, and in the treatment of Mg+micronutrients the enzyme activity was six times as high as that of control treatment. Although the effect of mineral nutrients on the suppression of nitrate accumulation in lettuce was relatively small in this study, an appropriate supply of mineral nutrients could be one of the solutions for the nitrate accumulation in vegetables.
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Claims 6
Claim · model-written summary
Mg and micronutrients significantly increased lettuce fresh weight, most strongly together.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- Mg and micronutrientse0
- Outcome
- Fresh weighte0
- Direction
- increasede0
- Qualifier
- Mg+micronutrient treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fresh weight of lettuce was significantly increased by the application of Mg and micronutrients, and the effect was the most significant in the Mg+micronutrient treatment”
Claim · model-written summary
Micronutrient treatment increased lettuce chlorophyll and micronutrient contents.
- Taxon
- LettuceLactuca sativat0
- Treatment
- micronutrient treatmentse0
- Outcome
- contents of chlorophyll and micronutrientse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“contents of chlorophyll and micronutrients were higher in the plants of micronutrient treatments”
t0“Lettuce”
Claim · model-written summary
Mg and/or micronutrient applications reduced lettuce nitrate content by about 14-18%.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Mg and/or micronutrient applicationse0
- Outcome
- Contents of nitratee0
- Direction
- reducede0
- Value
- about 14-18%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Contents of nitrate were reduced by about 14-18% in lettuce with Mg and/or micronutrient applications”
Claim · model-written summary
Micronutrient treated plants had higher nitrate reductase activity than controls.
- Taxon
- LettuceLactuca sativat0
- Treatment
- micronutrientse0
- Outcome
- nitrate reductase activitye0
- Direction
- highere0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to the plants of control treatment, nitrate reductase activity was also higher in those plants treated with micronutrients”
t0“Lettuce”
Claim · model-written summary
Mg plus micronutrients produced six times the control nitrate reductase activity.
- Taxon
- LettuceLactuca sativat0
- Treatment
- Mg+micronutrientse0
- Outcome
- enzyme activitye0
- Direction
- six times as highe0
- Value
- six timese0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the treatment of Mg+micronutrients the enzyme activity was six times as high as that of control treatment”
t0“Lettuce”
Claim · model-written summary
Appropriate mineral nutrient supply could help reduce nitrate accumulation in vegetables.
Verbatim
e0“an appropriate supply of mineral nutrients could be one of the solutions for the nitrate accumulation in vegetables”
The same questions in other papers
magnesium atom · nutrient: content · Lactuca sativa (garden lettuce)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
magnesium atom · growth · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- positive
micronutrient · growth · Lactuca sativa (garden lettuce)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- 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.