Abstract
We evaluated the effect of phosphorus application rates from various sources and in the presence or absence of filter cake on soil phosphorus, plant phosphorus, changes in acid phosphatase activity, and sugarcane productivity grown in Eutrophic Red Ultisol. Three P sources were used (triple superphosphate, Araxa rock phosphate, and Bayovar rock phosphate) and four application rates (0, 90, 180, and 360 kg ha(-1) of P2O5) in the presence or absence of filter cake (7.5 t ha(-1), dry basis). The soil P, the accumulated plant P, the leaf acid phosphatase activity and straw, the stalk productivity, the concentration of soluble solids in the juice (Brix), the juice sucrose content (Pol), and the purity were the parameters evaluated. We found that P applications increased levels of soil, leaf, and juice phosphorus and led to higher phosphorus accumulation and greater stalk and straw productivity. These levels were highest in the presence of filter cake. Acid phosphatase activity decreased with increasing plant phosphorus concentration. Phosphate fertilization did not show effect on sugarcane technological quality. We concluded that P application, regardless of source, improved phosphorus nutrition and increased productivity in sugarcane and, when associated with filter cake, reduced the need for mineral fertilizer.
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Claims 6
Claim · model-written summary
P applications increased soil, leaf and juice phosphorus levels in sugarcane.
- Taxon
- sugarcanee2
- Treatment
- P applicationse5
- Outcome
- soil, leaf, and juice phosphoruse5
- Direction
- increasede5
Not reportedComparator
Verbatim
e2“sugarcane productivity grown in Eutrophic Red Ultisol”
e5“P applications increased levels of soil, leaf, and juice phosphorus and led to higher phosphorus accumulation and greater stalk and straw productivity”
Claim · model-written summary
P applications led to higher phosphorus accumulation in sugarcane.
Not reportedComparator
Verbatim
e2“sugarcane productivity grown in Eutrophic Red Ultisol”
e5“P applications increased levels of soil, leaf, and juice phosphorus and led to higher phosphorus accumulation and greater stalk and straw productivity”
Claim · model-written summary
P applications led to greater stalk and straw productivity in sugarcane.
Not reportedComparator
Verbatim
e2“sugarcane productivity grown in Eutrophic Red Ultisol”
e5“P applications increased levels of soil, leaf, and juice phosphorus and led to higher phosphorus accumulation and greater stalk and straw productivity”
Claim · model-written summary
Acid phosphatase activity in sugarcane leaves decreased as plant phosphorus concentration increased.
Verbatim
e2“sugarcane productivity grown in Eutrophic Red Ultisol”
e0“Acid phosphatase activity decreased with increasing plant phosphorus concentration”
Claim · model-written summary
Phosphate fertilization had no effect on sugarcane technological quality.
- Taxon
- sugarcanee4
- Treatment
- Phosphate fertilizatione4
- Outcome
- technological qualitye4
- Direction
- did not show effecte4
Not reportedComparator
Verbatim
e4“Phosphate fertilization did not show effect on sugarcane technological quality”
Claim · model-written summary
Phosphorus application combined with filter cake reduces the need for mineral fertilizer in sugarcane.
Verbatim
e2“sugarcane productivity grown in Eutrophic Red Ultisol”
e1“when associated with filter cake, reduced the need for mineral fertilizer”
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