Abstract
Abstract Rice ( Oryza sativa L.) production is seldom limited by availability of Mn in mineral soils. Manganese deficiency of seedling rice was suspected, however, in drained Histosols with pH values near or exceeding 7.0 in the Everglades Agricultural Area. Several greenhouse and field studies were conducted to verify the occurrence of Mn deficiency, to document its effect on rice growth, and to explore methods for alleviating the deficiency in Histosols. Manganese deficiency was determined to limit the growth of rice seedlings drill‐planted in several drained Histosols having pH values ranging from 6.9 to 7.7. Approximately 3 wk after seedling emergence, deficiency symptoms were evident as interveinal chlorosis on fully expanded leaves. Affected seedlings were shorter, had fewer leaves, weighed less, and had less root mass and length than unaffected seedlings. Affected seedlings contained <20 mg Mn kg −1 tissue. The deficiency also reduced grain yield in the field. In the greenhouse, several methods were investigated for preventing the deficiency. These included soaking seeds in Mn solutions, foliar application of Mn, flooding, or placing Mn fertilizer with the seed at planting. The latter proved to be the best method for preventing the deficiency. The results of the field studies indicated that application of approximately 15 kg Mn ha −1 as MnSO 4 with the seed prevented the deficiency and provided near‐maximum grain yields.
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Claims 7
Claim · model-written summary
Mn deficiency limited growth of drill-planted rice seedlings in drained Histosols.
- Taxon
- rice
Oryza sativae0 - Outcome
- growth of rice seedlingse0
- Direction
- limite0
- Qualifier
- pH values ranging from 6.9 to 7.7e0
- Setting
- drained Histosolse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Manganese deficiency was determined to limit the growth of rice seedlings drill‐planted in several drained Histosols having pH values ranging from 6.9 to 7.7”
Claim · model-written summary
Deficiency symptoms appeared as interveinal chlorosis about three weeks after emergence.
- Taxon
- riceOryza sativat0
- Organ / stage
- fully expanded leavese0
- Outcome
- interveinal chlorosise0
- Value
- 3 wke0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Approximately 3 wk after seedling emergence, deficiency symptoms were evident as interveinal chlorosis on fully expanded leaves”
t0“Rice”
Claim · model-written summary
Affected seedlings were shorter, had fewer leaves and less mass and root growth.
- Taxon
- riceOryza sativat0
- Outcome
- shorter, had fewer leaves, weighed lesse0
- Direction
- lesse0
- Comparator
- unaffected seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Affected seedlings were shorter, had fewer leaves, weighed less, and had less root mass and length than unaffected seedlings”
t0“Rice”
Claim · model-written summary
Affected seedlings contained less than 20 mg Mn per kg tissue.
- Taxon
- riceOryza sativat0
- Outcome
- Mne0
- Value
- <20 mg Mn kg −1 tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Affected seedlings contained <20 mg Mn kg −1 tissue”
t0“Rice”
Claim · model-written summary
Mn deficiency reduced field grain yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The deficiency also reduced grain yield in the field”
t0“Rice”
Claim · model-written summary
Placing Mn fertilizer with the seed was the best greenhouse method for preventing deficiency.
- Taxon
- riceOryza sativat0
- Treatment
- placing Mn fertilizer with the seed at plantinge0
- Outcome
- preventing the deficiencye0
- Direction
- beste0
- Comparator
- soaking seeds in Mn solutions, foliar application of Mn, floodinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These included soaking seeds in Mn solutions, foliar application of Mn, flooding, or placing Mn fertilizer with the seed at planting. The latter proved to be the best method for preventing the deficiency”
t0“Rice”
Claim · model-written summary
Field application of approximately 15 kg Mn ha −1 as MnSO 4 with seed prevented deficiency and gave near-maximum grain yields.
- Taxon
- riceOryza sativat0
- Treatment
- application of approximately 15 kg Mn ha −1 as MnSO 4 with the seede0
- Outcome
- near‐maximum grain yieldse0
- Direction
- near‐maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of approximately 15 kg Mn ha −1 as MnSO 4 with the seed prevented the deficiency and provided near‐maximum grain yields”
t0“Rice”
The same questions in other papers
manganese(II) sulfate · yield · Oryza sativa (rice)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.