Abstract
The objective of the present paper was to evaluate the effect of nitrogen level on yield and fruit quality of citrus and to determine the optimum N fertilizer rates of Navel orange variety budded on Troyer citrange rootstock in field conditions. The orange Navel orchard spaced 7mx7m (204 trees/ha) grown in 1964 on a sandy soil at the experimental station of El Menzeh, INRA Morocco. The experiment was set up in a complete randomized block design with three blocks and the experimental unit was composed on 4 consecutive trees in the row. Four fertilization treatments of N (Kg/ha) (T0 (control): 0, T1: 100, T2: 200, T3: 300) were applied to Navel citrus tree in field conditions over two seasons 2012-2013 and 2013-2014.Fruit yield, fruit weight, fruit size, total soluble sugar (TSS) content, acidity of juice and maturity index of Navel orange were significantly affected by increasing N level. Fruit yield/tree was improved significantly with increase in N rate. Significant highest yields (129.21 and 139.82. kg/tree) were recorded under treatments T2 and T3 respectively. The lowest fruit yield/tree was obtained from untreated control plot. Maximum fruit weight (268.54 and 276.50 g) and fruit size (78.94 and 80.87 mm) was recorded with the same treatments T2 and T3 respectively. Total soluble sugar content was also maximum in trees receiving treatment (T2) and treatment (T3) 12.20 and 11.70°Brix respectively. Significant increase in acidity of juice of fruit Navel orange was also recorded by increasing the rate of N. The highest acidity (1.13 and 1.20%) was achieved by the same treatments T2 and T3 respectively. Two-year studies showed that application of fertilizers at the rate of 200 Kg N/ha would be optimum for achieving higher yield and better fruit quality of Navel orange variety in sandy soil in Gharb area.
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Claims 10
Claim · model-written summary
Fruit yield per tree was improved significantly by increasing N rate in Navel orange.
- Taxon
- Navel orange variety
Citrus sinensist0 - Treatment
- increase in N ratee1
- Outcome
- Fruit yield/treee1
- Direction
- improvede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Navel orange variety”
e1“Fruit yield/tree was improved significantly with increase in N rate”
Claim · model-written summary
The highest Navel orange yields, 129.21 and 139.82 kg/tree, were recorded under treatments T2 and T3.
- Taxon
- Navel orange varietyCitrus sinensist0
- Treatment
- treatments T2 and T3e2
- Outcome
- yieldse2
- Direction
- higheste2
- Value
- 129.21 and 139.82. kg/treee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Navel orange variety”
e2“Significant highest yields (129.21 and 139.82. kg/tree) were recorded under treatments T2 and T3 respectively”
Claim · model-written summary
The untreated control plot gave the lowest fruit yield per tree in Navel orange.
- Taxon
- Navel orange varietyCitrus sinensist0
- Outcome
- fruit yield/treee3
- Direction
- loweste3
- Comparator
- untreated control plote3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Navel orange variety”
e3“The lowest fruit yield/tree was obtained from untreated control plot”
Claim · model-written summary
Maximum fruit weight of Navel orange, 268.54 and 276.50 g, was recorded under the same treatments T2 and T3.
- Taxon
- Navel orange varietyCitrus sinensist0
- Treatment
- the same treatments T2 and T3e4
- Outcome
- fruit weighte4
- Direction
- Maximume4
- Value
- 268.54 and 276.50 ge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Navel orange variety”
e4“Maximum fruit weight (268.54 and 276.50 g) and fruit size (78.94 and 80.87 mm) was recorded with the same treatments T2 and T3 respectively”
Claim · model-written summary
Maximum fruit size of Navel orange, 78.94 and 80.87 mm, was recorded under the same treatments T2 and T3.
- Taxon
- Navel orange varietyCitrus sinensist0
- Treatment
- the same treatments T2 and T3e4
- Outcome
- fruit sizee4
- Direction
- Maximume4
- Value
- 78.94 and 80.87 mme4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Navel orange variety”
e4“Maximum fruit weight (268.54 and 276.50 g) and fruit size (78.94 and 80.87 mm) was recorded with the same treatments T2 and T3 respectively”
Claim · model-written summary
Total soluble sugar content of Navel orange was maximum in the T2 and T3 treatments, 12.20 and 11.70 Brix.
- Taxon
- Navel orange varietyCitrus sinensist0
- Treatment
- treatment (T2) and treatment (T3)e5
- Outcome
- Total soluble sugar contente5
- Direction
- maximume5
- Value
- 12.20 and 11.70°Brixe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Navel orange variety”
e5“Total soluble sugar content was also maximum in trees receiving treatment (T2) and treatment (T3) 12.20 and 11.70°Brix respectively”
Claim · model-written summary
Increasing the N rate significantly increased juice acidity of Navel orange.
- Taxon
- Navel orange varietyCitrus sinensist0
- Treatment
- increasing the rate of Ne6
- Outcome
- acidity of juicee6
- Direction
- increasee6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Navel orange variety”
e6“Significant increase in acidity of juice of fruit Navel orange was also recorded by increasing the rate of N”
Claim · model-written summary
The highest juice acidity of Navel orange, 1.13 and 1.20%, was under the same treatments T2 and T3.
- Taxon
- Navel orange varietyCitrus sinensist0
- Treatment
- the same treatments T2 and T3e7
- Outcome
- aciditye7
- Direction
- higheste7
- Value
- 1.13 and 1.20%e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Navel orange variety”
e7“The highest acidity (1.13 and 1.20%) was achieved by the same treatments T2 and T3 respectively”
Claim · model-written summary
Increasing N level significantly affected the maturity index of Navel orange.
- Taxon
- Navel orange varietyCitrus sinensist0
- Treatment
- increasing N levele1
- Outcome
- maturity indexe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Navel orange variety”
e1“maturity index of Navel orange were significantly affected by increasing N level”
Claim · model-written summary
About 200 kg N/ha is suggested as the optimum fertiliser rate for higher yield and better fruit quality of Navel orange on sandy soil in the Gharb area.
- Taxon
- Navel orange varietyCitrus sinensist0
- Treatment
- 200 Kg N/hae1
- Outcome
- higher yield and better fruit qualitye1
- Setting
- sandy soil in Gharb areae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Navel orange variety”
e1“application of fertilizers at the rate of 200 Kg N/ha would be optimum for achieving higher yield and better fruit quality of Navel orange variety in sandy soil in Gharb area”
The same questions in other papers
nitrogen · yield · Citrus sinensis (sweet orange)Results differ
38 papers in the same direction as this paper · 8 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
44 papers more in this group
See all 48 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.