Abstract
Watermelon [ Citrullus lanatus (Thunb.) Matsum. & Nakai] were grown with three rates each of lime, gypsum, and K during two seasons to evaluate their effects on fruit production and mineral concentration. The first experimental site was a recently cleared Sparr fine sand with an initial water pH of 5.0 and Mehlich I extractable K of 8 mg·kg -1 (very low) and 20 mg·kg -1 Ca (very low). The second site was a virgin Pomona fine sand with a water pH of 4.8, 28 mg·kg -1 K (low), and 612 mg·kg -1 Ca (high). `Crimson Sweet' fruit yields were reduced 10% with an increase in lime rate from 0 to 4.48 t·ha -1 in the first season. In the second season, lime rate had no effect on yield. In both seasons, fruit yields were reduced 14% with an increase in Ca from gypsum from 0 to 1.12 t·ha -1 . On the soil testing very low in K, yield increased with an increase in K rate from 90 to 224 kg·ha -1 with no lime or gypsum. On the soil testing low in K, greatest yields were obtained with 90 kg·ha -1 K with no lime and gypsum. Application of lime and gypsum increased Ca and decreased K in seedlings but not consistently in older leaf and fruit tissues. An increase in K application increased leaf K in the first season but not in the second. Fruit firmness and soluble solids content were not consistently affected by treatment during the two seasons. Thus, on soils low in toxic elements (Mn and Al) such as used in this study, watermelon will grow well and tolerate a wide range of soil pH values without additional Ca from lime or gypsum.
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Claims 10
Claim · model-written summary
Lime rate increase from 0 to 4.48 t/ha reduced Crimson Sweet fruit yield by 10% in the first season.
- Taxon
- Watermelon
Citrullus lanatust0 - Material
- Crimson Sweete1
- Treatment
- increase in lime rate from 0 to 4.48 t·ha -1e1
- Outcome
- fruit yieldse1
- Direction
- reducede1
- Value
- 10%e1
- Setting
- first seasone1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon Production”
e1“`Crimson Sweet' fruit yields were reduced 10% with an increase in lime rate from 0 to 4.48 t·ha -1 in the first season”
Claim · model-written summary
Lime rate had no effect on watermelon fruit yield in the second season.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- lime ratee2
- Outcome
- yielde2
- Direction
- no effecte2
- Setting
- second seasone2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon Production”
e2“In the second season, lime rate had no effect on yield”
Claim · model-written summary
Increasing Ca from gypsum from 0 to 1.12 t/ha reduced watermelon fruit yields by 14% in both seasons.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- increase in Ca from gypsume3
- Outcome
- fruit yieldse3
- Direction
- reducede3
- Value
- 14%e3
- Setting
- both seasonse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon Production”
e3“In both seasons, fruit yields were reduced 14% with an increase in Ca from gypsum from 0 to 1.12 t·ha -1”
Claim · model-written summary
On very low-K soil, raising K from 90 to 224 kg/ha increased watermelon yield without lime or gypsum.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- K rate from 90 to 224 kg·ha -1e4
- Outcome
- yielde4
- Direction
- increasede4
- Qualifier
- with no lime or gypsume4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon Production”
e4“On the soil testing very low in K, yield increased with an increase in K rate from 90 to 224 kg·ha -1 with no lime or gypsum”
Claim · model-written summary
On low-K soil, the greatest watermelon yields were obtained with 90 kg/ha K without lime and gypsum.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- 90 kg·ha -1 Ke5
- Outcome
- greatest yieldse5
- Direction
- greateste5
- Qualifier
- with no lime and gypsume5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon Production”
e5“On the soil testing low in K, greatest yields were obtained with 90 kg·ha -1 K with no lime and gypsum”
Claim · model-written summary
Lime and gypsum application increased seedling Ca concentration, not consistently in older leaf and fruit tissues.
- Taxon
- WatermelonCitrullus lanatust0
- Organ / stage
- seedlingse6
- Treatment
- Application of lime and gypsume6
- Outcome
- Cae6
- Direction
- increasede6
- Qualifier
- not consistently in older leaf and fruit tissuese6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon Production”
e6“Application of lime and gypsum increased Ca and decreased K in seedlings but not consistently in older leaf and fruit tissues”
Claim · model-written summary
Lime and gypsum application decreased seedling K concentration, not consistently in older leaf and fruit tissues.
- Taxon
- WatermelonCitrullus lanatust0
- Organ / stage
- seedlingse6
- Treatment
- Application of lime and gypsume6
- Outcome
- Ke6
- Direction
- decreasede6
- Qualifier
- not consistently in older leaf and fruit tissuese6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon Production”
e6“Application of lime and gypsum increased Ca and decreased K in seedlings but not consistently in older leaf and fruit tissues”
Claim · model-written summary
Increasing K application increased leaf K in the first season but not in the second.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- An increase in K applicatione7
- Outcome
- leaf Ke7
- Direction
- increasede7
- Qualifier
- but not in the seconde7
- Setting
- first seasone7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon Production”
e7“An increase in K application increased leaf K in the first season but not in the second. Fruit firmness and soluble solids content were not consistently affected by treatment during the two seasons”
Claim · model-written summary
Fruit firmness and soluble solids content were not consistently affected by treatment over the two seasons.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- treatmente7
- Outcome
- Fruit firmness and soluble solids contente7
- Direction
- not consistently affectede7
- Setting
- two seasonse7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Watermelon Production”
e7“Fruit firmness and soluble solids content were not consistently affected by treatment during the two seasons”
Claim · model-written summary
Watermelon is expected to grow well and tolerate a wide range of soil pH values on low-toxic-element soils without added lime or gypsum Ca.
- Taxon
- watermelonCitrullus lanatuse0
- Outcome
- grow well and tolerate a wide range of soil pH valuese0
- Qualifier
- on soils low in toxic elements (Mn and Al)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on soils low in toxic elements (Mn and Al) such as used in this study, watermelon will grow well and tolerate a wide range of soil pH values without additional Ca from lime or gypsum”
The same questions in other papers
calcium atom · yield · Citrullus lanatus (watermelon)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- negative
- positive
1 paper more in this group
See all 5 papers →lime · yield · Citrullus lanatus (watermelon)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
potassium · yield · Citrullus lanatus (watermelon)Positive and negative results
15 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
13 papers more in this group
See all 17 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.