Abstract
Background: Ultisols are characterized by low pH, low cation exchange capacity and low base saturation due to dominance of kaolinite and oxides and hydrous oxides of iron and aluminium. Among the basic cations, magnesium has smaller ionic size and larger hydrated radius which limits binding of Mg to soil exchange sites. As a result the deficiency of magnesium is a common nutritional disorder in these soils due to leaching of bases under humid tropical conditions. The determination of critical level of magnesium in soil and plant helps to manage the nutrient deficiency and will help to avoid crop loss. Methods: A pot culture experiment was conducted to determine the critical level of magnesium for cowpea in Ultisols of Kerala during January 2019. Graded doses of magnesium were applied @ 5 mg kg-1 to 80 mg kg-1 of soil as magnesium carbonate along with recommended dose of fertilizers to evaluate the effect of applied magnesium on soil pH, available magnesium in soil, magnesium content in plant, crop uptake and yield. Result: Soil pH and available magnesium in soil recorded at flowering and harvest was highest where magnesium was applied @ 80 mg kg-1 of soil. Magnesium content in stem and leaves was found to increase with the levels of magnesium added. No significant variation in the content of magnesium in pods was recorded. Crop uptake (66.62 mg g-1) of magnesium and yield per plant (79.33 g plant-1) was highest in the treatment (T5) where magnesium was applied @ 10 mg kg-1 of soil. The critical level of magnesium determined by Cate and Nelson graphical method was found to be 75 mg kg-1 of available magnesium in soil and 0.38% in leaves of cowpea during flowering.
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Claims 9
Claim · model-written summary
Soil pH was highest with 80 mg kg-1 magnesium.
- Taxon
- cowpea
Vigna unguiculatae0t0
Not reportedComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil pH and available magnesium in soil recorded at flowering and harvest was highest where magnesium was applied @ 80 mg kg-1 of soil.”
t0“Cowpea”
Claim · model-written summary
Available soil magnesium was highest with 80 mg kg-1 magnesium.
- Taxon
- cowpeaVigna unguiculatae0t0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil pH and available magnesium in soil recorded at flowering and harvest was highest where magnesium was applied @ 80 mg kg-1 of soil.”
t0“Cowpea”
Claim · model-written summary
Stem magnesium content increased with applied magnesium levels.
- Taxon
- cowpeaVigna unguiculatae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Magnesium content in stem and leaves was found to increase with the levels of magnesium added.”
t0“Cowpea”
Claim · model-written summary
Leaf magnesium content increased with applied magnesium levels.
- Taxon
- cowpeaVigna unguiculatae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Magnesium content in stem and leaves was found to increase with the levels of magnesium added.”
t0“Cowpea”
Claim · model-written summary
Pod magnesium content did not vary significantly.
- Taxon
- cowpeaVigna unguiculatae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant variation in the content of magnesium in pods was recorded.”
t0“Cowpea”
Claim · model-written summary
Magnesium uptake peaked at 66.62 mg g-1 with the 10 mg kg-1 treatment.
- Taxon
- cowpeaVigna unguiculatae0t0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop uptake (66.62 mg g-1) of magnesium and yield per plant (79.33 g plant-1) was highest in the treatment (T5) where magnesium was applied @ 10 mg kg-1 of soil.”
t0“Cowpea”
Claim · model-written summary
Yield per plant peaked at 79.33 g plant-1 with the 10 mg kg-1 treatment.
- Taxon
- cowpeaVigna unguiculatae0t0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop uptake (66.62 mg g-1) of magnesium and yield per plant (79.33 g plant-1) was highest in the treatment (T5) where magnesium was applied @ 10 mg kg-1 of soil.”
t0“Cowpea”
Claim · model-written summary
Critical available soil magnesium was 75 mg kg-1.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- available magnesium in soile0
- Value
- 75 mg kg-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical level of magnesium determined by Cate and Nelson graphical method was found to be 75 mg kg-1 of available magnesium in soil and 0.38% in leaves of cowpea during flowering.”
Claim · model-written summary
Critical leaf magnesium during flowering was 0.38%.
- Taxon
- cowpeaVigna unguiculatae0
- Organ / stage
- leavese0
- Outcome
- magnesiume0
- Value
- 0.38%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical level of magnesium determined by Cate and Nelson graphical method was found to be 75 mg kg-1 of available magnesium in soil and 0.38% in leaves of cowpea during flowering.”
The same questions in other papers
magnesium atom · yield · Vigna unguiculata (cowpea)Results differ
5 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
4 papers more in this group
See all 8 papers →magnesium atom · nutrient: content · Vigna unguiculata (cowpea)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- 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.