Abstract
Summary Mn deficiency is a common nutritional disorder affecting the growth, yield and fruit quality of citrus plants. Twenty-three-year-old 'Washington Navel' orange ( Citrus sinensis L.) trees budded onto sour orange ( C. aurantium L.) rootstock and grown in two sites (I and II) of an orchard were used. Based on the leaf Mn concentrations, 20 Mn deficient and 10 non Mn deficient trees were selected on 26 January 2000. The trees were separated in 6 groups; each one consisted of 5 trees with similar Mn status. The mean Mn concentrations in the leaves of the groups 1, 2, 3, 4, 5, and 6 were 8.8, 10.5, 11.2, 13.8, 18.3, and 19.8 mg kg -1 dry weight (d.w.), respectively. The trees of the groups 1-4 were grown in the site I, while those of the groups 5 and 6 in the site II of the orchard. One tree group in each orchard site (site I: group 3; site II: group 6) was not sprayed with Mn and used as a control, while the trees of the other groups (1, 2, 4 and 5) were sprayed on 06 February 2000 with MnSO 4 .H 2 O (800 mg l -1 Mn). From 18 February 2000 until 19 January 2001, 11 leaf samplings were conducted to monitor the Mn status of the trees. The concentrations of Mn in the leaves of the groups 3 and 6 (controls) were almost constant and presented no significant differences among the samplings. With regard to the Mn treated trees, at the first post-treatment sampling (18 February 2000), the leaf Mn levels were higher by 16.5-25.1 mg kg -1 d.w., respectively, in relation to their pre-treatment status. At the last sampling (19 January 2001), the Mn status of the trees was also improved by 4.5-7.5 mg kg -1 (d.w.), compared to their pre-treatment status. Overall, when the concentration of Mn in the leaves is equal or higher than 14 mg kg -1 d.w., before the spray Mn treatment, only one application of MnSO 4 .H 2 O (800 mg l -1 Mn) on February is sufficient to cover the Mn needs of the trees for a whole year. In other cases (leaf Mn levels equal or lower than 13 mg kg -1 d.w.), the trees should be re-sprayed on July or August.
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Claims 5
Claim · model-written summary
Unsprayed control leaf manganese concentrations remained nearly constant, without significant sampling differences.
Verbatim
e0“The concentrations of Mn in the leaves of the groups 3 and 6 (controls) were almost constant and presented no significant differences among the samplings”
e1“'Washington Navel' orange”
Claim · model-written summary
Sprayed trees had higher leaf manganese at first sampling by 16.5-25.1 mg kg -1 d.w. relative to pretreatment.
Verbatim
e0“With regard to the Mn treated trees, at the first post-treatment sampling (18 February 2000), the leaf Mn levels were higher by 16.5-25.1 mg kg -1 d.w., respectively, in relation to their pre-treatment status”
e1“'Washington Navel' orange”
Claim · model-written summary
At final sampling, sprayed trees retained improved manganese status by 4.5-7.5 mg kg -1 d.w. versus pretreatment.
Verbatim
e0“At the last sampling (19 January 2001), the Mn status of the trees was also improved by 4.5-7.5 mg kg -1 (d.w.), compared to their pre-treatment status”
e1“'Washington Navel' orange”
Claim · model-written summary
For trees with initial leaf Mn at least 14 mg kg -1 d.w., one February spray suffices for a year.
Verbatim
e0“when the concentration of Mn in the leaves is equal or higher than 14 mg kg -1 d.w., before the spray Mn treatment, only one application of MnSO 4 .H 2 O (800 mg l -1 Mn) on February is sufficient to cover the Mn needs of the trees for a whole year”
e1“'Washington Navel' orange”
Claim · model-written summary
Trees with initial leaf Mn no greater than 13 mg kg -1 d.w. should be resprayed in July or August.
Verbatim
e0“In other cases (leaf Mn levels equal or lower than 13 mg kg -1 d.w.), the trees should be re-sprayed on July or August”
e1“'Washington Navel' orange”
The same questions in other papers
manganese atom · nutrient: content · Citrus sinensis (sweet orange)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
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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.