Abstract
Abstract In Brazilian sugarcane production systems, P fertilizer represents a substantial input cost, yet it is used with low efficiency. Furthermore, extractants currently used to estimate available P in highly weathered soils are not satisfactory. Understanding soil P transformations is a prerequisite to improving estimates of available P and fertilizer use efficiency. We used a sequential P fractionation procedure to examine short‐term dynamics of P from fertilizer, residue returns, and soil, and long‐term changes in forms and quantities of soil P as a result of fertilization. Mulch and burn systems of residue management were imposed as treatments in field‐grown sugarcane ( Saccharum officinarum L.) in northeast Brazil. Both treatments had similar inputs of P from residues (8.7 kg ha −1 ) but, despite the higher “available” P content of the ashes, more of the added P was mobilized and taken up by the plant in the mulch system, probably due to the presence of roots within the decomposing litter and more intense root exploration of the topsoil as a result of an improved moisture regime. This improved moisture and P supply was reflected in a 45% higher ratoon yield in the mulch treatment. Fertilizer P applied in a furrow 20 cm deep with the plant crop was concentrated in the more labile fractions, and had a residual effect on the first ratoon of about 30%. Over the long term (10 yr) there was accumulation (about 144 kg ha −1 ) of fertilizer P in the top 30 cm (in both labile and stable fractions). Nearly one‐half of the increase was in the first 7.5 cm of soil, a reflection of limited mixing of broadcast applications and uptake from the 7.5‐ to 15‐cm layer.
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Claims 6
Claim · model-written summary
Mulching mobilized more added phosphorus for sugarcane uptake than burning.
Verbatim
e0“more of the added P was mobilized and taken up by the plant in the mulch system”
e1“Mulch and burn systems of residue management were imposed as treatments in field‐grown sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
Ratoon yield was 45% higher under mulching.
Verbatim
e0“a 45% higher ratoon yield in the mulch treatment”
e1“Mulch and burn systems of residue management were imposed as treatments in field‐grown sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
Furrow-applied fertilizer phosphorus was concentrated in more labile fractions.
Verbatim
e0“Fertilizer P applied in a furrow 20 cm deep with the plant crop was concentrated in the more labile fractions”
t0“under Sugarcane”
Claim · model-written summary
Furrow-applied phosphorus had about a 30% residual effect on the first ratoon.
Verbatim
e0“had a residual effect on the first ratoon of about 30%”
e1“Fertilizer P applied in a furrow 20 cm deep with the plant crop”
t0“under Sugarcane”
Claim · model-written summary
After 10 years, about 144 kg ha −1 of fertilizer phosphorus accumulated in the top 30 cm of soil.
Verbatim
e0“Over the long term (10 yr) there was accumulation (about 144 kg ha −1 ) of fertilizer P in the top 30 cm (in both labile and stable fractions)”
t0“under Sugarcane”
Claim · model-written summary
Nearly half of the phosphorus increase was in the first 7.5 cm of soil.
Verbatim
e0“Nearly one‐half of the increase was in the first 7.5 cm of soil”
t0“under Sugarcane”
The same questions in other papers
mulching · yield · Saccharum officinarum (sugarcane)Positive and negative results
32 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- negative
- negative
32 papers more in this group
See all 36 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.