Abstract
Citrus decline is developing in the southern part of Iran. NH4–N form and factors that limit the uptake of calcium, magnesium and micronutrients by root cause increased citrus decline severity. In this study, the effect of nutritional management on the control of the complication of citrus loss in Valencia orange trees (Citrus scinensis L. Osbeck) was investigated. The experiment was conducted in a randomized complete block design with seven treatments in four replications and four trees per each plot, during 2016 and 2018. - Control (nutrition based on soil test and with ammonium sulfate nitrogen source) - Supplementary soil fertigation with micronutrients iron + zinc + copper + manganese EDDHA chelates at three times during the growth of shoots in the spring; calcium nitrate; magnesium nitrate - Foliar nutrition with micronutrients zinc sulfate + manganese sulfate + boric acid + copper sulfate; potassium nitrate and magnesium nitrate. The results showed that, leaf potassium concentration had a positive correlation with root decay and shoot dieback. Supplemental soil fertigation with micronutrients, calcium and magnesium nitrate caused a significant increase in fibrous root density and reduction of root decay percentage. Supplemental soil fertigation with calcium nitrate and foliar nutrition with magnesium nitrate resulted in significant improvement of citrus decline indices in Valencia oranges, including leaf fall, shoot diebacks, leaf special weight, leaf water content, and quantitative and qualitative of fruits. Due to the negative effect of excessive potassium concentration on aggravation of citrus decline, balanced consumption of potassium in citrus orchards is recommended.
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Claims 8
Claim · model-written summary
Leaf potassium concentration was positively correlated with root decay and shoot dieback.
- Taxon
- Valencia orange trees
Citrus sinensise2 - Compound
- potassiume1
- Outcome
- root decay and shoot diebacke1
- Direction
- positive correlatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“leaf potassium concentration had a positive correlation with root decay and shoot dieback”
e2“Valencia orange trees (Citrus scinensis L. Osbeck)”
Claim · model-written summary
Supplemental soil fertigation with micronutrients, calcium and magnesium nitrate significantly increased fibrous root density relative to the control.
- Taxon
- Valencia orange treesCitrus sinensise2
- Treatment
- Supplemental soil fertigation with micronutrients, calcium and magnesium nitratee1
- Outcome
- fibrous root densitye1
- Direction
- increasee1
- Comparator
- Control (nutrition based on soil test and with ammonium sulfate nitrogen source)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Supplemental soil fertigation with micronutrients, calcium and magnesium nitrate caused a significant increase in fibrous root density and reduction of root decay percentage”
e2“Valencia orange trees (Citrus scinensis L. Osbeck)”
e3“Control (nutrition based on soil test and with ammonium sulfate nitrogen source)”
Claim · model-written summary
Supplemental soil fertigation with micronutrients, calcium and magnesium nitrate reduced the root decay percentage relative to the control.
- Taxon
- Valencia orange treesCitrus sinensise2
- Treatment
- Supplemental soil fertigation with micronutrients, calcium and magnesium nitratee1
- Outcome
- root decay percentagee1
- Direction
- reductione1
- Comparator
- Control (nutrition based on soil test and with ammonium sulfate nitrogen source)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Supplemental soil fertigation with micronutrients, calcium and magnesium nitrate caused a significant increase in fibrous root density and reduction of root decay percentage”
e2“Valencia orange trees (Citrus scinensis L. Osbeck)”
e3“Control (nutrition based on soil test and with ammonium sulfate nitrogen source)”
Claim · model-written summary
Foliar nutrition with magnesium nitrate significantly improved citrus decline indices: leaf fall, shoot dieback and leaf special weight.
- Taxon
- Valencia orangesCitrus sinensise4
- Treatment
- foliar nutrition with magnesium nitratee4
- Outcome
- leaf fall, shoot diebacks, leaf special weighte4
- Direction
- improvemente4
- Comparator
- Control (nutrition based on soil test and with ammonium sulfate nitrogen source)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“foliar nutrition with magnesium nitrate resulted in significant improvement of citrus decline indices in Valencia oranges, including leaf fall, shoot diebacks, leaf special weight”
e3“Control (nutrition based on soil test and with ammonium sulfate nitrogen source)”
Claim · model-written summary
Foliar nutrition with magnesium nitrate significantly improved leaf water content and fruit quantity and quality in Valencia oranges.
- Taxon
- Valencia orangesCitrus sinensise5
- Treatment
- foliar nutrition with magnesium nitratee5
- Outcome
- leaf water content, and quantitative and qualitative of fruitse5
- Direction
- improvemente5
- Comparator
- Control (nutrition based on soil test and with ammonium sulfate nitrogen source)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Supplemental soil fertigation with calcium nitrate and foliar nutrition with magnesium nitrate resulted in significant improvement of citrus decline indices in Valencia oranges, including leaf fall, shoot diebacks, leaf special weight, leaf water content, and quantitative and qualitative of fruits”
e3“Control (nutrition based on soil test and with ammonium sulfate nitrogen source)”
Claim · model-written summary
Supplemental soil fertigation with calcium nitrate significantly improved citrus decline indices in Valencia oranges.
- Taxon
- Valencia orangesCitrus sinensise5
- Treatment
- Supplemental soil fertigation with calcium nitratee5
- Outcome
- citrus decline indicese5
- Direction
- improvemente5
- Comparator
- Control (nutrition based on soil test and with ammonium sulfate nitrogen source)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Supplemental soil fertigation with calcium nitrate and foliar nutrition with magnesium nitrate resulted in significant improvement of citrus decline indices in Valencia oranges, including leaf fall, shoot diebacks, leaf special weight, leaf water content, and quantitative and qualitative of fruits”
e3“Control (nutrition based on soil test and with ammonium sulfate nitrogen source)”
Claim · model-written summary
Excessive potassium concentration negatively affected and aggravated citrus decline.
- Taxon
- Valencia orange treesCitrus sinensise2
- Compound
- excessive potassium concentratione7
- Outcome
- aggravation of citrus declinee7
- Direction
- negative effecte7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Due to the negative effect of excessive potassium concentration on aggravation of citrus decline”
e2“Valencia orange trees (Citrus scinensis L. Osbeck)”
Claim · model-written summary
Balanced potassium consumption in citrus orchards is recommended.
- Outcome
- balanced consumption of potassium in citrus orchardse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“balanced consumption of potassium in citrus orchards is recommended”
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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.