Abstract
Sugarcane is the most promising among crops that produce renewable biofuels. An adequate availability of water and nutrients, especially nitrogen (N), is of utmost importance. The objective of this study was to evaluate stalk yield and the recovery of N-urea by sugarcane (plant-cane) subjected to different levels of water replacements and nitrogen fertilization doses using the 15 N isotopic dilution technique. The experiment was conducted in the southwest region of the state of Gois, Brazil, using plastic pots. The experimental design was complete randomized blocks analyzed in 3 3 split plots with three replications. The treatments consisted of three levels of water replacements (75, 50 and 25%) and three N doses (60, 120 and 180 kg ha-1) in the form of enriched 15 N urea. N doses did not affect stalk yield, probably because 91.14% of all N accumulated in culms came from the soil and other sources. The rainfall (1,194.2 mm) was sufficient to meet the water requirements of the crop. The recovery of N-urea was not influenced by the N doses and represented on average of 20.5% of the total amount applied. The soil and other sources were the main providers of N to sugarcane plants regardless of the mineral-N dose applied.
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Claims 6
Claim · model-written summary
Nitrogen doses did not affect sugarcane stalk yield.
Not reportedComparator
Verbatim
t0“sugarcane”
e0“N doses did not affect stalk yield”
Claim · model-written summary
Most nitrogen accumulated in culms came from soil and other sources.
Verbatim
t0“sugarcane”
e0“91.14% of all N accumulated in culms came from the soil and other sources”
Claim · model-written summary
Rainfall was sufficient to meet sugarcane water requirements.
Verbatim
t0“sugarcane”
e0“The rainfall (1,194.2 mm) was sufficient to meet the water requirements of the crop.”
Claim · model-written summary
Urea nitrogen recovery was unaffected by nitrogen dose.
Not reportedComparator
Verbatim
t0“sugarcane”
e0“The recovery of N-urea was not influenced by the N doses”
Claim · model-written summary
Mean urea nitrogen recovery was 20.5% of the amount applied.
Verbatim
t0“sugarcane”
e0“represented on average of 20.5% of the total amount applied”
Claim · model-written summary
Soil and other sources supplied most nitrogen to sugarcane regardless of mineral nitrogen dose.
Verbatim
e0“The soil and other sources were the main providers of N to sugarcane plants regardless of the mineral-N dose applied.”
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