Abstract
The zinc (Zn) supply increases the fruit yield of Citrus trees that are grown, especially in the highly weathered soils of the tropics due to the inherently low nutrient availability in the soil solution. Leaf sprays containing micronutrients are commonly applied to orchards, even though the nutrient supply via soil could be of practical value. This study aimed to evaluate the effect of Zn fertilizers that are applied to the soil surface on absorption and partitioning of the nutrient by citrus trees. A greenhouse experiment was conducted with one-year-old sweet orange trees. The plants were grown in soils with different textures (18.1 or 64.4% clay) that received 1.8 g Zn per plant, in the form of either ZnO or ZnSO4 enriched with the stable isotope 68Zn. Zinc fertilization increased the availability of the nutrient in the soil and the content in the orange trees. Greater responses were obtained when ZnSO4 was applied to the sandy loam soil due to its lower specific metal adsorption compared to that of the clay soil. The trunk and branches accumulated the most fertilizer-derived Zn (Zndff) and thus represent the major reserve organ for this nutrient in the plant. The trees recovered up to 4% of the applied Zndff. Despite this relative low recovery, the Zn requirement of the trees was met with the selected treatment based on the total leaf nutrient content and increased Cu/Zn-SOD activity in the leaves. We conclude that the efficiency of Zn fertilizers depends on the fertilizer source and the soil texture, which must be taken into account by guidelines for fruit crop fertilization via soil, in substitution or complementation of traditional foliar sprays.
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Claims 9
Claim · model-written summary
Zinc fertilization increased nutrient availability in soil.
CitrusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Trees”
e0“Zinc fertilization increased the availability of the nutrient in the soil”
Claim · model-written summary
Zinc fertilization increased nutrient content in orange trees.
- Taxon
- orange treese0
- Treatment
- Zinc fertilizatione0
- Outcome
- content in the orange treese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Zinc fertilization increased the availability of the nutrient in the soil and the content in the orange trees”
Claim · model-written summary
Zinc sulfate gave greater citrus responses in sandy loam than clay soil.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Trees”
e0“Greater responses were obtained when ZnSO4 was applied to the sandy loam soil due to its lower specific metal adsorption compared to that of the clay soil”
Claim · model-written summary
Trunk and branches accumulated the most fertilizer-derived zinc and served as major reserve organs.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Trees”
e0“The trunk and branches accumulated the most fertilizer-derived Zn (Zndff) and thus represent the major reserve organ for this nutrient in the plant”
Claim · model-written summary
Citrus trees recovered up to 4% of fertilizer-derived zinc.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Trees”
e0“The trees recovered up to 4% of the applied Zndff”
Claim · model-written summary
The selected zinc treatment met tree zinc requirements based on leaf nutrient content.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Trees”
e0“the Zn requirement of the trees was met with the selected treatment based on the total leaf nutrient content”
Claim · model-written summary
The selected treatment increased leaf Cu/Zn-SOD activity.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Trees”
e0“increased Cu/Zn-SOD activity in the leaves”
Claim · model-written summary
Fertilizer efficiency depends on source and soil texture.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Trees”
e0“the efficiency of Zn fertilizers depends on the fertilizer source and the soil texture”
Claim · model-written summary
Soil fertilizer guidelines should account for fertilizer source and soil texture.
- Outcome
- guidelines for fruit crop fertilization via soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Trees”
e0“fertilizer source and the soil texture, which must be taken into account by guidelines for fruit crop fertilization via soil”
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See all 32 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.