Abstract
Precrops have different growth patterns, nitrogen (N) requirements, and production of residues varying in amounts and quality that may affect the N-clycling and the soybean (Glycine max L. Merrill) cropped in succession. This study aimed to evaluate the effect of precrops and N fertilization on soybean performance. An experiment was conducted in Londrina, Paraná State, Brazil, with six precrops treatments: fallow, ruzigrass (Urochloa ruziziensis), showy rattlebox (Crotalaria spectabilis), corn (Zea mays) without or with 80 kg ha−1 of N at topdressing as urea, and wheat (Triticum aestivum). Subplots consisted of two levels of N fertilization at soybean sowing: 0 and 30 kg ha−1 of N as ammonium nitrate at sowing. Urochloa ruziziensis as precrops increased the soybean yield (5,171 kg ha-1) when compared with corn (4,346 kg ha-1) and fallow (4,467 kg ha-1). In 2016/17, N fertilization of soybean with 30 kg ha−1 of N at sowing, although increasing the initial plant growth (745 kg ha-1 with vs. 662 kg ha-1 without), impairs nodulation (100 mg pl-1 with vs. 130 g pl-1 without) and does not increase grain yield. Oil and protein concentrations in soybean grains are not influenced by precrops and N fertilization at sowing. We found that the use Urochloa ruziziensis as cover crop in soybean precrops is a good recommendation option in tropical regions of Brazil, because increasing the yield of soybean grown in succession. N fertilization at in soybean sowing it should not be recommended even in the presence of a large amount of straw.
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Claims 8
Claim · model-written summary
Urochloa ruziziensis as precrop increased soybean yield compared with corn.
- Taxon
- soybean
Glycine maxe0 - Treatment
- Urochloa ruziziensis as precropse1
- Outcome
- soybean yielde1
- Direction
- increasede1
- Value
- 5,171 kg ha-1e1
- Qualifier
- 4,346 kg ha-1e1
- Comparator
- corne1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max L. Merrill)”
e1“Urochloa ruziziensis as precrops increased the soybean yield (5,171 kg ha-1) when compared with corn (4,346 kg ha-1) and fallow (4,467 kg ha-1)”
Claim · model-written summary
Urochloa ruziziensis as precrop increased soybean yield compared with fallow.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Urochloa ruziziensis as precropse1
- Outcome
- soybean yielde1
- Direction
- increasede1
- Value
- 5,171 kg ha-1e1
- Qualifier
- 4,467 kg ha-1e1
- Comparator
- fallowe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max L. Merrill)”
e1“Urochloa ruziziensis as precrops increased the soybean yield (5,171 kg ha-1) when compared with corn (4,346 kg ha-1) and fallow (4,467 kg ha-1)”
Claim · model-written summary
N fertilization of soybean at sowing increased initial plant growth compared with no N fertilization.
- Taxon
- soybeanGlycine maxe0
- Treatment
- N fertilization of soybeane2
- Outcome
- initial plant growthe3
- Direction
- increasinge3
- Value
- 745 kg ha-1e3
- Qualifier
- 662 kg ha-1e3
- Comparator
- withoute3
- Setting
- 2016/17e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max L. Merrill)”
e2“In 2016/17, N fertilization of soybean”
e3“although increasing the initial plant growth (745 kg ha-1 with vs. 662 kg ha-1 without)”
Claim · model-written summary
N fertilization of soybean at sowing impaired nodulation.
- Taxon
- soybeanGlycine maxe0
- Treatment
- N fertilization of soybeane2
- Outcome
- nodulatione4
- Direction
- impairse4
- Value
- 100 mg pl-1e4
- Qualifier
- 130 g pl-1e4
- Comparator
- withoute4
- Setting
- 2016/17e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max L. Merrill)”
e2“In 2016/17, N fertilization of soybean”
e4“impairs nodulation (100 mg pl-1 with vs. 130 g pl-1 without)”
Claim · model-written summary
N fertilization of soybean at sowing did not increase grain yield.
- Taxon
- soybeanGlycine maxe0
- Treatment
- N fertilization of soybeane2
- Outcome
- grain yielde5
- Direction
- does not increasee5
- Setting
- 2016/17e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max L. Merrill)”
e2“In 2016/17, N fertilization of soybean”
e5“does not increase grain yield”
Claim · model-written summary
Oil and protein concentrations in soybean grains were not influenced by precrops or N fertilization at sowing.
- Taxon
- soybeanGlycine maxe6
- Treatment
- precrops and N fertilization at sowinge6
- Outcome
- Oil and protein concentrationse6
- Direction
- not influencede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Oil and protein concentrations in soybean grains are not influenced by precrops and N fertilization at sowing”
Claim · model-written summary
Urochloa ruziziensis as cover crop in soybean precrops is a good recommendation in tropical Brazil.
- Taxon
- soybeanGlycine maxe7
- Outcome
- use Urochloa ruziziensis as cover crop in soybean precropse7
- Setting
- tropical regions of Brazile7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“the use Urochloa ruziziensis as cover crop in soybean precrops is a good recommendation option in tropical regions of Brazil”
Claim · model-written summary
N fertilization at soybean sowing should not be recommended, even with a large amount of straw.
- Taxon
- soybeanGlycine maxe1
- Outcome
- N fertilization at in soybean sowinge1
- Qualifier
- even in the presence of a large amount of strawe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“N fertilization at in soybean sowing it should not be recommended even in the presence of a large amount of straw”
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