Abstract
No-tillage systems associated with intercropping practices of grains and forages as cover crops are increasing in the Cerrado agricultural areas. The aim of this study was to quantify the nitrogen (N) uptake efficiency of maize (Zea mays L.) grown as monoculture and intercropped with tropical forages under a no-tillage system by using the 15N isotope tracer in conjunction with measurements of soil microbial biomass N and available soil N. The experiment was conducted in the 2010–11 growing season, in a Dystrophic Red-Yellow Latosol (Typic Haplustox) in the Cerrado. The experiment was established in a complete randomised block design with three replicates with the following treatments: maize monoculture; maize intercropped with Panicum maximum Jacq. cv. Aruana; and maize intercropped with Brachiaria humidicola (Rendle) Schweick. Nitrogen was applied as ammonium sulfate at a rate of 100 kg ha–1 (30 kg N ha–1 was applied at planting and 70 kg N ha–1 as a side-dressing). The N-fertiliser uptake efficiency in maize and grain yield was not affected by the presence of the intercropped forages. The intercropped B. humidicola and P. maximum recovered 2.08% and 3.71% of the N fertiliser applied, respectively. The soil was the main N source for maize. Maize intercropped with P. maximum showed higher values of microbial biomass N and available N in the soil.
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Claims 7
Claim · model-written summary
Intercropped forage did not affect maize fertilizer nitrogen uptake efficiency.
- Treatment
- presence of the intercropped foragese0
- Outcome
- N-fertiliser uptake efficiency in maizee0
- Direction
- not affectede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N-fertiliser uptake efficiency in maize and grain yield was not affected by the presence of the intercropped forages.”
t0“maize”
Claim · model-written summary
Intercropped forage did not affect maize grain yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N-fertiliser uptake efficiency in maize and grain yield was not affected by the presence of the intercropped forages.”
t0“maize”
Claim · model-written summary
Intercropped B. humidicola recovered 2.08% of applied nitrogen fertilizer.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intercropped B. humidicola and P. maximum recovered 2.08% and 3.71% of the N fertiliser applied, respectively.”
t0“maize”
Claim · model-written summary
Intercropped P. maximum recovered 3.71% of applied nitrogen fertilizer.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intercropped B. humidicola and P. maximum recovered 2.08% and 3.71% of the N fertiliser applied, respectively.”
t0“maize”
Claim · model-written summary
Soil was the principal nitrogen source for maize.
- Outcome
- main N source for maizee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soil was the main N source for maize.”
t0“maize”
Claim · model-written summary
Maize intercropped with P. maximum had higher soil microbial biomass nitrogen.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize intercropped with P. maximum showed higher values of microbial biomass N and available N in the soil.”
t0“maize”
Claim · model-written summary
Maize intercropped with P. maximum had higher available soil nitrogen.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize intercropped with P. maximum showed higher values of microbial biomass N and available N in the soil.”
t0“maize”
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