Abstract
In order to optimize the management of nitrogen and potassium fertilizer inputs with fertigation in soils under pear tree orchard cultivation, two field experiments were carried out in the Portuguese Region of Oeste over seven years. The experiments were conducted in two fertigated orchards of the Portuguese cultivar Rocha grafted on EMA, with different ages (P1 was planted in 1991, and P2 in 1998). The experiments were randomized complete block designs with three replications. Seven experimental treatments were imposed, consisting of different partitions of the same levels of nitrogen and potassium fertilization (on average 43 kg ha -1 , N and 80 kg ha -1 , K20 at P1, and 44 kg ha -1 , N and 71 kg ha -1 , K 2 O at P2) over the growing season, plus a control, without fertilization. No significant differences (P=0.05) were found among the experimental treatments on the yield and quality parameters in the younger orchard. In contrast, in P1 the application of nitrogen in at three different times -1/3 at bud stage + 1/3 after fruit set + 1/3 before fruits reached 14 mm of equatorial diameter, plus the application of potassium every week, from bud stage to one week before harvest - lead to the highest mean annual yield (around 33 kg per tree), although without significant differences (P=0.05) from the experimental treatment consisting of the application of nitrogen every week and the application of potassium three times a year. The quality parameters of the produced fruits (firmness of the pulp, total soluble solids, and titratable acidity), in both trials, were within the adequate range values for the cultivar, although they were affected by the experimental treatments.
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Claims 4
Claim · model-written summary
In the younger orchard, nitrogen and potassium fertigation partitions did not differ significantly in yield or quality parameters.
- Taxon
- pear
_Poirier_Fleurs_et_feuilles.jpg?width=60)
Pyrus communist0 - Treatment
- different partitions of the same levels of nitrogen and potassium fertilizatione1
- Outcome
- yield and quality parameterse2
- Direction
- no_changeinferrede2
- Qualifier
- in the younger orcharde2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Poirier_Fleurs_et_feuilles.jpg?width=500)
Verbatim
t0“FERTIGATED PEAR ORCHARDS”
e1“Seven experimental treatments were imposed, consisting of different partitions of the same levels of nitrogen and potassium fertilization”
e2“No significant differences (P=0.05) were found among the experimental treatments on the yield and quality parameters in the younger orchard”
Claim · model-written summary
In P1, nitrogen applied at three times with weekly potassium gave the highest mean annual yield, around 33 kg per tree, without significant difference from weekly nitrogen with potassium three times a year.
- Taxon
- pearPyrus communist0
- Treatment
- in P1 the application of nitrogen in at three different timese3
- Outcome
- mean annual yielde4
- Direction
- higheste4
- Value
- around 33 kg per treee4
- Comparator
- the application of nitrogen every week and the application of potassium three times a yeare5
- Setting
- P1e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“FERTIGATED PEAR ORCHARDS”
e3“in P1 the application of nitrogen in at three different times”
e4“lead to the highest mean annual yield (around 33 kg per tree)”
e5“although without significant differences (P=0.05) from the experimental treatment consisting of the application of nitrogen every week and the application of potassium three times a year”
Claim · model-written summary
Nitrogen and potassium fertigation treatments affected the firmness, total soluble solids and titratable acidity of pear fruit.
- Taxon
- pearPyrus communist0
- Treatment
- experimental treatmentse7
- Outcome
- firmness of the pulp, total soluble solids, and titratable aciditye6
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“FERTIGATED PEAR ORCHARDS”
e6“The quality parameters of the produced fruits (firmness of the pulp, total soluble solids, and titratable acidity), in both trials, were within the adequate range values for the cultivar”
e7“although they were affected by the experimental treatments”
Claim · model-written summary
Firmness, total soluble solids and titratable acidity of pear fruit were within the adequate range values for the cultivar.
- Taxon
- pearPyrus communist0
- Outcome
- firmness of the pulp, total soluble solids, and titratable aciditye6
- Qualifier
- within the adequate range values for the cultivare6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“FERTIGATED PEAR ORCHARDS”
e6“The quality parameters of the produced fruits (firmness of the pulp, total soluble solids, and titratable acidity), in both trials, were within the adequate range values for the cultivar”
The same questions in other papers
fertilization · quality: general · Pyrus communis (pear)Positive and negative results
3 in the opposite direction
- positive
- positive
- positive
nitrogen · yield · Pyrus communis (pear)Positive and negative results
7 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- no effect
- no effect
9 papers more in this group
See all 13 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.