Abstract
Studies were conducted to investigate the influence of inorganic fertilizers on the yield and fruit quality of Citrus sinensis [L] Osbeck cv. Late Valencia at the Agricultural Research Station, Okumaning near Kade (ARS-Kade). The trees which were 30 years old, had been budded onto either Rough lemon, C. jambheri Lush (RL), Cleopatra mandarin, C. reticulata Blanco (CM), or Rangpur lime, C. limonia (RGL), rootstocks. The fertilizer treatments common to all the rootstocks were as follows: T1 (control, no fertilizer); T2 (96.4, 40.2, 201 and 70 kg N, P2O5, K2O and S/ha, respectively); T3 (204, 80.4, 402 and 135.6 kg N, P2O5, K2O and S/ha, respectively). In treatments T2 and T3, the fertilizers applied were 15-15-15, sulphate of ammonia, and muriate of potash. For RL, an additional treatment (T4) was applied as in T3 but without S. The effects of fertilizer application rates on the pH, percent juice content, juice volume, total soluble solids (TSS), titratable acidity (TA), and TSS/TA ratio were investigated. Fertilizer application increased yield significantly, irrespective of rootstock. The increases ranged between 89 and 122 per cent for RL; 23 and 72 per cent for CM, and 26 and 67 per cent for RGL compared to the no fertilizer application. For RL, ammonium sulphate as N source tended to increase yield more than urea. Increasing fertilizer rate resulted in significant yield increases, irrespective of rootstock. While the pH and TSS/TA ratio of the juice was increased, titratable acidity was decreased by fertilizer application. Except for CM, the highest juice volume was observed from T2. In addition, the TSS was highest at T2 while ammonium sulphate application increased the TSS content of the fruit more than urea, suggesting the importance of sulphur in improving fruit quality. Fertilizer application reduced the maturity period of the fruit as measured by the TSS/TA ratio. A minimum TSS/TA ratio of 10 is recommended for acceptance as maturity index for sweet oranges in Ghana. Ghana Jnl agric. Sci. Vol.31(1) 1998: 27-33
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Claims 13
Claim · model-written summary
Fertilizer significantly increased yield across rootstocks.
- Taxon
- sweet orange
Citrus sinensist0 - Treatment
- Fertilizer applicatione0
- Outcome
- yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer application increased yield significantly, irrespective of rootstock.”
t0“sweet orange”
Claim · model-written summary
Yield increases on RL ranged from 89 to 122 per cent versus no fertilizer.
- Taxon
- sweet orangeCitrus sinensist0
- Material
- RLe0
- Treatment
- fertilizer applicatione0
- Outcome
- increasese0
- Direction
- increasese0
- Value
- 89 and 122 per cente0
- Comparator
- no fertilizer applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increases ranged between 89 and 122 per cent for RL; 23 and 72 per cent for CM, and 26 and 67 per cent for RGL compared to the no fertilizer application.”
t0“sweet orange”
Claim · model-written summary
Yield increases on CM ranged from 23 to 72 per cent versus no fertilizer.
- Taxon
- sweet orangeCitrus sinensist0
- Material
- CMe0
- Treatment
- fertilizer applicatione0
- Outcome
- increasese0
- Direction
- increasese0
- Value
- 23 and 72 per cente0
- Comparator
- no fertilizer applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increases ranged between 89 and 122 per cent for RL; 23 and 72 per cent for CM, and 26 and 67 per cent for RGL compared to the no fertilizer application.”
t0“sweet orange”
Claim · model-written summary
Yield increases on RGL ranged from 26 to 67 per cent versus no fertilizer.
- Taxon
- sweet orangeCitrus sinensist0
- Material
- RGLe0
- Treatment
- fertilizer applicatione0
- Outcome
- increasese0
- Direction
- increasese0
- Value
- 26 and 67 per cente0
- Comparator
- no fertilizer applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increases ranged between 89 and 122 per cent for RL; 23 and 72 per cent for CM, and 26 and 67 per cent for RGL compared to the no fertilizer application.”
t0“sweet orange”
Claim · model-written summary
Ammonium sulphate tended to increase yield more than urea on RL.
- Taxon
- sweet orangeCitrus sinensist0
- Material
- RLe0
- Treatment
- ammonium sulphatee0
- Outcome
- yielde0
- Direction
- increasee0
- Qualifier
- tended toe0
- Comparator
- ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For RL, ammonium sulphate as N source tended to increase yield more than urea.”
t0“sweet orange”
Claim · model-written summary
Increasing fertilizer rate significantly increased yield across rootstocks.
- Taxon
- sweet orangeCitrus sinensist0
- Treatment
- Increasing fertilizer ratee0
- Outcome
- yielde0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing fertilizer rate resulted in significant yield increases, irrespective of rootstock.”
t0“sweet orange”
Claim · model-written summary
Fertilizer increased juice pH and TSS/TA ratio.
- Taxon
- sweet orangeCitrus sinensist0
- Treatment
- fertilizer applicatione0
- Outcome
- pH and TSS/TA ratio of the juicee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While the pH and TSS/TA ratio of the juice was increased, titratable acidity was decreased by fertilizer application.”
t0“sweet orange”
Claim · model-written summary
Fertilizer decreased titratable acidity.
- Taxon
- sweet orangeCitrus sinensist0
- Treatment
- fertilizer applicatione0
- Outcome
- titratable aciditye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While the pH and TSS/TA ratio of the juice was increased, titratable acidity was decreased by fertilizer application.”
t0“sweet orange”
Claim · model-written summary
T2 gave the highest juice volume except on CM rootstock.
- Taxon
- sweet orangeCitrus sinensist0
- Treatment
- T2e0
- Outcome
- juice volumee0
- Direction
- higheste0
- Qualifier
- Except for CMe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except for CM, the highest juice volume was observed from T2.”
t0“sweet orange”
Claim · model-written summary
T2 produced the highest TSS.
- Taxon
- sweet orangeCitrus sinensist0
- Treatment
- T2e0
- Outcome
- TSSe0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the TSS was highest at T2”
t0“sweet orange”
Claim · model-written summary
Ammonium sulphate increased fruit TSS more than urea.
- Taxon
- sweet orangeCitrus sinensist0
- Treatment
- ammonium sulphate applicatione0
- Outcome
- TSS content of the fruite0
- Direction
- increasede0
- Comparator
- ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ammonium sulphate application increased the TSS content of the fruit more than urea”
t0“sweet orange”
Claim · model-written summary
Fertilizer reduced fruit maturity period as measured by the TSS/TA ratio.
- Taxon
- sweet orangeCitrus sinensist0
- Treatment
- Fertilizer applicatione0
- Outcome
- maturity period of the fruite0
- Direction
- reducede0
- Qualifier
- as measured by the TSS/TA ratioe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer application reduced the maturity period of the fruit as measured by the TSS/TA ratio.”
t0“sweet orange”
Claim · model-written summary
A TSS/TA ratio of at least 10 is recommended as the maturity index for sweet oranges in Ghana.
- Taxon
- sweet orangesCitrus sinensise0
- Outcome
- maturity indexe0
- Value
- 10e0
- Setting
- Ghanae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A minimum TSS/TA ratio of 10 is recommended for acceptance as maturity index for sweet oranges in Ghana.”
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