Abstract
The decomposition and release of nutrients from unburned and mechanically harvested sugar-cane trash was evaluated under two agricultural environments in Sao Paulo State, Brazil. In the first agricultural environment (AE 1), part of a rain fed commercial field was used in the Ribeirao Preto region. In the second agricultural environment (AE 2), the study was conducted on an irrigated experimental area of the Escola Superior de Agricultura ‘Luiz de Queiroz’ in Piracicaba county. At this site, the influence of application of urea, potassium chloride and vinasse upon the decomposition of sugarcane trash was evaluated in lysimeters. Trash mass reductions of about 20% and 70% were observed at AE 1 and AE 2, respectively, after one year. Nutrient treatments did not affect trash decomposition or nutrient cycling at AE 2. The highest carbon losses, in both agricultural environments, came from decarboxilation of cellular contents and hemicellulose. Potassium was the most labile nutrient in crop residues, with 85– 93% of the total potassium being released across sites in the study period. Only 20% of the total nitrogen was released. The release of calcium and magnesium ranged from 40% to 60%, across sites. In AE 1, there was no release of phosphorus and only 11% of the sulfur was released. However, in AE 2 the release of these nutrients reached 60%. The higher nutrient release and sugarcane trash decomposition in AE 2, comparative to AE 1, was due to greater decomposition of cellular contents and this may have been associated with protection of labile organics at AE 1 by higher lignin content and a consistent moisture regime provided by irrigation at AE 2.
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Claims 13
Claim · model-written summary
Sugarcane trash mass was reduced by about 20% at AE 1 after one year.
Verbatim
t0“SUGARCANE TRASH”
e1“Trash mass reductions of about 20% and 70% were observed at AE 1 and AE 2, respectively, after one year”
Claim · model-written summary
Sugarcane trash mass was reduced by about 70% at AE 2 after one year.
Verbatim
t0“SUGARCANE TRASH”
e1“Trash mass reductions of about 20% and 70% were observed at AE 1 and AE 2, respectively, after one year”
Claim · model-written summary
Urea, potassium chloride and vinasse application did not affect sugarcane trash decomposition or nutrient cycling at AE 2.
- Taxon
- sugarcanet0
- Treatment
- urea, potassium chloride and vinassee2
- Outcome
- trash decomposition or nutrient cyclinge3
- Direction
- did not affecte3
- Setting
- AE 2e3
Not reportedComparator
Verbatim
t0“SUGARCANE TRASH”
e2“the influence of application of urea, potassium chloride and vinasse upon the decomposition of sugarcane trash was evaluated in lysimeters”
e3“Nutrient treatments did not affect trash decomposition or nutrient cycling at AE 2”
Claim · model-written summary
The highest carbon losses in both agricultural environments came from decarboxylation of cellular contents and hemicellulose.
Verbatim
t0“SUGARCANE TRASH”
e4“The highest carbon losses, in both agricultural environments, came from decarboxilation of cellular contents and hemicellulose”
Claim · model-written summary
Potassium was the most labile nutrient in sugarcane crop residues.
Not reportedDirection
Verbatim
t0“SUGARCANE TRASH”
e5“Potassium was the most labile nutrient in crop residues”
Claim · model-written summary
About 85-93% of total potassium was released from sugarcane trash across sites during the study period.
Verbatim
t0“SUGARCANE TRASH”
e6“with 85– 93% of the total potassium being released across sites in the study period”
Claim · model-written summary
Only 20% of the total nitrogen in sugarcane trash was released.
Verbatim
t0“SUGARCANE TRASH”
e7“Only 20% of the total nitrogen was released”
Claim · model-written summary
Calcium and magnesium release from sugarcane trash ranged from 40% to 60% across sites.
Verbatim
t0“SUGARCANE TRASH”
e0“The release of calcium and magnesium ranged from 40% to 60%, across sites”
Claim · model-written summary
No phosphorus was released from sugarcane trash at AE 1.
Not reportedDirection
Verbatim
t0“SUGARCANE TRASH”
e1“In AE 1, there was no release of phosphorus and only 11% of the sulfur was released”
Claim · model-written summary
Only 11% of the sulfur was released from sugarcane trash at AE 1.
Verbatim
t0“SUGARCANE TRASH”
e1“In AE 1, there was no release of phosphorus and only 11% of the sulfur was released”
Claim · model-written summary
Phosphorus and sulfur release from sugarcane trash reached 60% at AE 2.
Verbatim
t0“SUGARCANE TRASH”
e2“However, in AE 2 the release of these nutrients reached 60%”
Claim · model-written summary
Higher nutrient release in AE 2 than in AE 1 was attributed to greater decomposition of cellular contents.
Verbatim
e3“The higher nutrient release and sugarcane trash decomposition in AE 2, comparative to AE 1, was due to greater decomposition of cellular contents”
Claim · model-written summary
Labile organics may have been protected at AE 1 by higher lignin content.
Verbatim
t0“SUGARCANE TRASH”
e4“this may have been associated with protection of labile organics at AE 1 by higher lignin content”
The same questions in other papers
potassium chloride · nutrient: content · Saccharum officinarum (sugarcane)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
nitrogen · nutrient: content · Saccharum officinarum (sugarcane)Positive and negative results
7 papers in the same direction as this paper · 23 in the opposite direction
- positive
- positive
- positive
27 papers more in this group
See all 31 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.