Abstract
Sugarcane (Saccharum spp.) harvested without burning provides a substantial amount of remains (trash) on soil profiles which can be decomposed and release nutrients contributing to reduce fertilizer needs. The contribution of nitrogen (N) from sugarcane plant residues and fertilizer in sugarcane nutrition was assessed. Plant cane treatments were micro plots of 15N-labeled urea, sugarcane trash and root system; the last two to simulate the previous crop residues incorporated into the soil after crop renewal. For ratoons, N-ammonium nitrate (N-AN) micro plots, 150 kg ha-1 of N-AN and control (0 kg ha-1) were set up to evaluate the contribution of trash in N supply and quantify the effects of N-fertilizer on N-trash mineralization. The N balances derived from each 15N source were calculated after four crops and resulted in: 15N-urea applied at planting, 31 % was recovered by plant cane, 12 % by the following ratoons, 20 % remained in the soil and 37 % was not found in the soil-system (NOC). For crop residues 15N-trash + roots 26 % was recovered by sugarcane, 51 % remained in soil, and 23 % was NOC. N-fertilizer applied to ratoons nearly doubled the amount of N from green harvest residues recovered by sugarcane; 17 vs. 31 %. Water balances and crop evapotranspiration were correlated with 15N-sources recoveries and cumulative N recovery presented a positive correlation with evapotranspiration (2005 to 2009). The 15N balances indicated that crop residues are supplementary sources of N for sugarcane and may contribute to reduce N fertilizer needs since trash is annually added to the soil.
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Claims 10
Claim · model-written summary
Of planting-applied 15N-urea, 31 % was recovered by plant cane.
Verbatim
e0“15N-urea applied at planting, 31 % was recovered by plant cane, 12 % by the following ratoons, 20 % remained in the soil and 37 % was not found in the soil-system (NOC).”
t0“sugarcane”
Claim · model-written summary
Of planting-applied 15N-urea, 12 % was by the following ratoons.
Verbatim
e0“15N-urea applied at planting, 31 % was recovered by plant cane, 12 % by the following ratoons, 20 % remained in the soil and 37 % was not found in the soil-system (NOC).”
t0“sugarcane”
Claim · model-written summary
Of planting-applied 15N-urea, 20 % was remained in the soil.
Verbatim
e0“15N-urea applied at planting, 31 % was recovered by plant cane, 12 % by the following ratoons, 20 % remained in the soil and 37 % was not found in the soil-system (NOC).”
t0“sugarcane”
Claim · model-written summary
Of planting-applied 15N-urea, 37 % was not found in the soil-system (NOC).
Verbatim
e0“15N-urea applied at planting, 31 % was recovered by plant cane, 12 % by the following ratoons, 20 % remained in the soil and 37 % was not found in the soil-system (NOC).”
t0“sugarcane”
Claim · model-written summary
Of residue nitrogen, 26 % recovered by sugarcane.
Verbatim
e0“For crop residues 15N-trash + roots 26 % was recovered by sugarcane, 51 % remained in soil, and 23 % was NOC.”
Claim · model-written summary
Of residue nitrogen, 51 % remained in soil.
Verbatim
e0“For crop residues 15N-trash + roots 26 % was recovered by sugarcane, 51 % remained in soil, and 23 % was NOC.”
Claim · model-written summary
Of residue nitrogen, 23 % was NOC.
Verbatim
e0“For crop residues 15N-trash + roots 26 % was recovered by sugarcane, 51 % remained in soil, and 23 % was NOC.”
Claim · model-written summary
Ratoon nitrogen fertilizer nearly doubled residue nitrogen recovery by sugarcane, from 17 to 31 %.
Verbatim
e0“N-fertilizer applied to ratoons nearly doubled the amount of N from green harvest residues recovered by sugarcane; 17 vs. 31 %.”
Claim · model-written summary
Cumulative nitrogen recovery correlated positively with evapotranspiration in 2005 to 2009.
Verbatim
e0“cumulative N recovery presented a positive correlation with evapotranspiration (2005 to 2009).”
t0“sugarcane”
Claim · model-written summary
Crop residues may reduce nitrogen fertilizer need in sugarcane.
Verbatim
e0“crop residues are supplementary sources of N for sugarcane and may contribute to reduce N fertilizer needs since trash is annually added to the soil.”
The same questions in other papers
nitrogen · yield · Saccharum officinarum (sugarcane)Results differ
117 papers in the same direction as this paper · 15 in the opposite direction · 4 reporting no difference from an alternative
- positive
- no effect
- negative
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