Abstract
Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria. 1. The optimal weight proportions among the nutrients present in the seedlings. In relation to N = 100, close to 75 K, 13 P, 9 Ca, and 9 Mg are required. 2. The optimal ratio between the nitrogen sources NH(4) and NO(3) in the solution. The best growth is recorded with about equivalent amounts. Nitrate alone is also highly productive. Cucumber prefers nitrate and is sensitive to high ammonium concentrations. 3. The optimal total concentration in the solution corresponds to 200 to 300 milligrams of nitrogen per liter, with the proportions of the nutrients according to criterion 1. Simple growth methods are suggested in which the three criteria are fulfilled.Calcium, especially, is found to accumulate in older leaves. It is proposed that this is not an expression for a physiological requirement for calcium but a mechanism for deposition of excess uptake important in adaptation to calcareous soils. This mechanism also operates at low calcium uptake rates, causing deficiency in the young parts, despite relatively high contents in the old leaves. Cucumber is therefore interpreted to be an obligate calcicole. The results are discussed in relation to similar experiments with birch (Betula verrucosa Ehrh.) seedlings, a species able to grow on very acid soils.
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Claims 13
Claim · model-written summary
Optimal K weight proportion is close to 75 relative to N = 100.
- Taxon
- cucumber (Cucumis sativus L.)
Cucumis sativuse0 - Compound
- Ke1
- Outcome
- optimal weight proportions among the nutrientse1
- Value
- 75e1
- Qualifier
- In relation to N = 100e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e1“The optimal weight proportions among the nutrients present in the seedlings. In relation to N = 100, close to 75 K, 13 P, 9 Ca, and 9 Mg are required”
Claim · model-written summary
Optimal P weight proportion is 13 relative to N = 100.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse0
- Compound
- Pe1
- Outcome
- optimal weight proportions among the nutrientse1
- Value
- 13e1
- Qualifier
- In relation to N = 100e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e1“The optimal weight proportions among the nutrients present in the seedlings. In relation to N = 100, close to 75 K, 13 P, 9 Ca, and 9 Mg are required”
Claim · model-written summary
Optimal Ca weight proportion is 9 relative to N = 100.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse0
- Compound
- Cae1
- Outcome
- optimal weight proportions among the nutrientse1
- Value
- 9e1
- Qualifier
- In relation to N = 100e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e1“The optimal weight proportions among the nutrients present in the seedlings. In relation to N = 100, close to 75 K, 13 P, 9 Ca, and 9 Mg are required”
Claim · model-written summary
Optimal Mg weight proportion is 9 relative to N = 100.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse0
- Compound
- Mge1
- Outcome
- optimal weight proportions among the nutrientse1
- Value
- 9e1
- Qualifier
- In relation to N = 100e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e1“The optimal weight proportions among the nutrients present in the seedlings. In relation to N = 100, close to 75 K, 13 P, 9 Ca, and 9 Mg are required”
Claim · model-written summary
The best cucumber growth is recorded with about equivalent NH4 and NO3 amounts.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse0
- Treatment
- nitrogen sources NH(4) and NO(3)e2
- Outcome
- best growthe2
- Direction
- beste2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e2“The optimal ratio between the nitrogen sources NH(4) and NO(3) in the solution. The best growth is recorded with about equivalent amounts”
Claim · model-written summary
Nitrate alone is also highly productive for cucumber.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse0
- Treatment
- Nitrate alonee3
- Outcome
- highly productivee3
- Direction
- highly productivee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e3“Nitrate alone is also highly productive”
Claim · model-written summary
Cucumber prefers nitrate.
- Taxon
- CucumberCucumis sativuse4
- Outcome
- prefers nitratee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e4“Cucumber prefers nitrate and is sensitive to high ammonium concentrations”
Claim · model-written summary
Cucumber is sensitive to high ammonium concentrations.
- Taxon
- CucumberCucumis sativuse4
- Treatment
- high ammonium concentrationse4
- Outcome
- sensitivee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e4“Cucumber prefers nitrate and is sensitive to high ammonium concentrations”
Claim · model-written summary
The optimal total solution concentration corresponds to 200 to 300 milligrams of nitrogen per liter.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse0
- Outcome
- optimal total concentration in the solutione5
- Value
- 200 to 300 milligrams of nitrogen per litere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e5“The optimal total concentration in the solution corresponds to 200 to 300 milligrams of nitrogen per liter”
Claim · model-written summary
Calcium accumulates in older leaves of cucumber.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse0
- Organ / stage
- older leavese6
- Compound
- Calciume6
- Outcome
- accumulatee6
- Direction
- accumulatee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e6“Calcium, especially, is found to accumulate in older leaves”
Claim · model-written summary
Calcium accumulation is proposed to be a mechanism for deposition of excess uptake rather than a physiological requirement.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse0
- Compound
- calciume7
- Outcome
- deposition of excess uptakee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e7“It is proposed that this is not an expression for a physiological requirement for calcium but a mechanism for deposition of excess uptake important in adaptation to calcareous soils”
Claim · model-written summary
Low calcium uptake rates cause deficiency in the young parts of cucumber despite high calcium in old leaves.
- Taxon
- cucumber (Cucumis sativus L.)Cucumis sativuse0
- Organ / stage
- young partse7
- Treatment
- low calcium uptake ratese7
- Outcome
- deficiency in the young partse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e7“This mechanism also operates at low calcium uptake rates, causing deficiency in the young parts, despite relatively high contents in the old leaves”
Claim · model-written summary
Cucumber is an obligate calcicole.
- Taxon
- CucumberCucumis sativuse7
- Outcome
- obligate calcicolee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral nutrient requirements for maximum growth rate of cucumber (Cucumis sativus L.) seedlings are estimated on the basis of three criteria”
e7“Cucumber is therefore interpreted to be an obligate calcicole”
The same questions in other papers
nitrogen · growth · Cucumis sativus (cucumber)Positive and negative results
20 papers in the same direction as this paper · 17 in the opposite direction
- negative
- negative
- negative
34 papers more in this group
See all 38 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.