Abstract
Potassium (K) is one of the essential nutrients for plants; nevertheless, it has been reported that overdoses of K fertilizer have resulted in impaired sugarcane juice quality and a reduction in the efficiency of sugar processing. Therefore, to maximize sugar production per unit area, K levels in sugarcane should be kept just adequate. The aim of this study was to propose a practical method of K fertilizer management based on the nutritional status of sugarcane juice. First, we conducted a pot experiment treating sugarcane with different K fertilizers (potassium chloride, KCl and potassium sulfate, K2SO4) and K rates (0, 2, 10, 30, and 50 g pot-1). Raising KCl rates caused considerably negative impacts on not only the quality but the yield as juice K concentration exceeded 2000 mg L-1, whereas the effects of the K2SO4 treatments were less severe. Second, we collected sugarcane juice at a raw sugar factory over 2 years. Because of its ease of measurement, electrical conductivity was used to deduce juice K concentration. The juice analysis revealed that more than 60% of the samples possessed K concentrations higher than 2000 mg L-1, and the relationship between juice K and sugarcane quality was significantly negative. These results indicate that impairments of sugarcane quality have probably been occurring in the actual fields. Given that sugarcane is generally fertilized with KCl, reducing K fertilizer dose should contribute to improving sugarcane quality and accordingly sugar yield when juice K is considered high.
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Claims 8
Claim · model-written summary
Increasing KCl rates harmed sugarcane juice quality once juice K exceeded 2000 mg L-1.
- Taxon
- sugarcanee1
- Treatment
- KCle0
- Outcome
- qualitye0
- Direction
- negative impactse0
- Qualifier
- juice K concentration exceeded 2000 mg L-1e0
Not reportedComparator
Verbatim
e0“Raising KCl rates caused considerably negative impacts on not only the quality but the yield as juice K concentration exceeded 2000 mg L-1”
e1“the nutritional status of sugarcane juice”
Claim · model-written summary
Increasing KCl rates harmed sugarcane yield once juice K exceeded 2000 mg L-1.
- Taxon
- sugarcanee1
- Treatment
- KCle0
- Outcome
- yielde0
- Direction
- negative impactse0
- Qualifier
- juice K concentration exceeded 2000 mg L-1e0
Not reportedComparator
Verbatim
e0“Raising KCl rates caused considerably negative impacts on not only the quality but the yield as juice K concentration exceeded 2000 mg L-1”
e1“the nutritional status of sugarcane juice”
Claim · model-written summary
K2SO4 treatments had less severe effects than KCl treatments.
Verbatim
e0“whereas the effects of the K2SO4 treatments were less severe”
e1“Raising KCl rates caused considerably negative impacts on not only the quality but the yield as juice K concentration exceeded 2000 mg L-1”
e2“the nutritional status of sugarcane juice”
Claim · model-written summary
Electrical conductivity was used to deduce sugarcane juice potassium concentration because it was easy to measure.
Not reportedComparatorValue
Verbatim
e0“Because of its ease of measurement, electrical conductivity was used to deduce juice K concentration.”
e1“the nutritional status of sugarcane juice”
Claim · model-written summary
More than 60% of factory sugarcane juice samples had potassium above 2000 mg L-1.
Verbatim
e0“more than 60% of the samples possessed K concentrations higher than 2000 mg L-1”
e1“sugarcane juice at a raw sugar factory”
Claim · model-written summary
Sugarcane juice K had a significant negative association with sugarcane quality.
Verbatim
e0“the relationship between juice K and sugarcane quality was significantly negative”
Claim · model-written summary
The authors infer that quality impairment likely occurs in actual sugarcane fields.
Verbatim
e0“impairments of sugarcane quality have probably been occurring in the actual fields”
Claim · model-written summary
The authors recommend reducing potassium fertilizer dose when sugarcane juice K is high to improve quality and sugar yield.
Verbatim
e0“reducing K fertilizer dose should contribute to improving sugarcane quality and accordingly sugar yield when juice K is considered high”
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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.