Abstract
Brachiaria species are widely cultivated and the low nitrogen (N) fertility of soils is one of the limiting factors for grass production in the Brazilian savannas (Cerrados). In the present study, we compared the characteristics of N utilization in Brachiaria brizantha (BB), B. decumbens (BD), and B. humidicola (BH), which are common species in these areas. In a soil culture experiment, BB, BD, and BH were grown under 3 levels of N, equivalent to 0 application (ON), 0.1 (1N), and 0.3 (2N) g N pot−1, with N as ammonium sulfate. The plant dry weight of BB and BD increased with the increase of N levels, whereas BH showed a weaker growth response to N application and the plant dry weight of BH was lower than that of BB and BD. The amount of N accumulated in plant increased with the increase of N levels in BB and BD. The amount of N accumulated in plant in BH was slightly lower than or almost comparable to that in BB and BD. The plant N concentration was higher in BH than in BB and BD. The stronger growth response of BB and BD resulted in a higher fertilizer use efficiency (FUE) and a N use efficiency in fertilizer application (NUEF). The N absorption efficiency (NAE) of BH was higher than that of the other two grasses for 1N and 2N. In the absence of N treatment (hereafter refferred to as “ON treatment”), the specific N absorption rate in the roots (SAR) was higher in BH than in BB and BD throughout the growth period. These data suggested that the N absorption ability in roots would be higher in BH than in the other 2 tested grasses, as confirmed by the Michaelis-Menten kinetic analysis. In a nitrate absorption experiment, the K m value of BH was lower than that of BB and BD. As BH showed a higher affinity for nitrate absorption, it could maintain a higher N absorption rate. Therefore, it was considered that the performance of N accumulation of BH would be slightly lower than or almost comparable to that of BB and BD because of the high ability of BH to absorb N, although dry matter production of BH was lower than that of BB and BD.
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Claims 12
Claim · model-written summary
Dry weight of B. brizantha increased with nitrogen level.
- Taxon
- Brachiaria brizantha
Urochloa brizanthae1 - Treatment
- N levelse0
- Outcome
- plant dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant dry weight of BB and BD increased with the increase of N levels”
e1“Brachiaria brizantha (BB)”
Claim · model-written summary
Dry weight of B. decumbens increased with nitrogen level.
- Taxon
- B. decumbens
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Urochloa decumbense1 - Treatment
- N levelse0
- Outcome
- plant dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The plant dry weight of BB and BD increased with the increase of N levels”
e1“B. decumbens (BD)”
Claim · model-written summary
B. humidicola had a weaker growth response to nitrogen and lower dry weight than the other grasses.
- Taxon
- B. humidicola
Urochloa humidicolae1 - Outcome
- plant dry weighte0
- Direction
- lowere0
- Comparator
- BB and BDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BH showed a weaker growth response to N application and the plant dry weight of BH was lower than that of BB and BD”
e1“B. humidicola (BH)”
Claim · model-written summary
Accumulated plant N increased with N level in B. brizantha.
- Taxon
- Brachiaria brizanthaUrochloa brizanthae1
- Treatment
- N levelse0
- Outcome
- amount of N accumulated in plante0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of N accumulated in plant increased with the increase of N levels in BB and BD”
e1“Brachiaria brizantha (BB)”
Claim · model-written summary
Accumulated plant N increased with N level in B. decumbens.
- Taxon
- B. decumbensUrochloa decumbense1
- Treatment
- N levelse0
- Outcome
- amount of N accumulated in plante0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of N accumulated in plant increased with the increase of N levels in BB and BD”
e1“B. decumbens (BD)”
Claim · model-written summary
B. humidicola accumulated slightly less or nearly comparable N than the other grasses.
- Taxon
- B. humidicolaUrochloa humidicolae1
- Outcome
- amount of N accumulated in plante0
- Direction
- slightly lowere0
- Comparator
- BB and BDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of N accumulated in plant in BH was slightly lower than or almost comparable to that in BB and BD”
e1“B. humidicola (BH)”
Claim · model-written summary
Plant N concentration was higher in B. humidicola than the other grasses.
- Taxon
- B. humidicolaUrochloa humidicolae1
- Outcome
- plant N concentratione0
- Direction
- highere0
- Comparator
- BB and BDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant N concentration was higher in BH than in BB and BD”
e1“B. humidicola (BH)”
Claim · model-written summary
B. brizantha and B. decumbens had higher fertilizer use and fertilizer N use efficiency because of stronger growth responses.
- Taxon
- Brachiaria brizanthaUrochloa brizanthae1
- Outcome
- fertilizer use efficiency (FUE) and a N use efficiency in fertilizer application (NUEF)e0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stronger growth response of BB and BD resulted in a higher fertilizer use efficiency (FUE) and a N use efficiency in fertilizer application (NUEF)”
e1“Brachiaria brizantha (BB)”
Claim · model-written summary
B. humidicola had higher N absorption efficiency at 1N and 2N.
- Taxon
- B. humidicolaUrochloa humidicolae1
- Outcome
- N absorption efficiency (NAE)e0
- Direction
- highere0
- Qualifier
- 1N and 2Ne0
- Comparator
- other two grassese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N absorption efficiency (NAE) of BH was higher than that of the other two grasses for 1N and 2N”
e1“B. humidicola (BH)”
Claim · model-written summary
Without N treatment, B. humidicola had a higher root specific N absorption rate throughout growth.
- Taxon
- B. humidicolaUrochloa humidicolae1
- Outcome
- specific N absorption rate in the roots (SAR)e0
- Direction
- highere0
- Comparator
- BB and BDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the specific N absorption rate in the roots (SAR) was higher in BH than in BB and BD throughout the growth period”
e1“B. humidicola (BH)”
Claim · model-written summary
B. humidicola had a lower nitrate absorption K m value than the other grasses.
- Taxon
- B. humidicolaUrochloa humidicolae1
- Outcome
- K m valuee0
- Direction
- lowere0
- Comparator
- BB and BDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the K m value of BH was lower than that of BB and BD”
e1“B. humidicola (BH)”
Claim · model-written summary
B. humidicola showed a higher affinity for nitrate absorption.
- Taxon
- B. humidicolaUrochloa humidicolae1
- Outcome
- affinity for nitrate absorptione0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BH showed a higher affinity for nitrate absorption”
e1“B. humidicola (BH)”
The same questions in other papers
nitrogen · growth · Urochloa decumbensPositive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
1 paper more in this group
See all 5 papers →nitrogen · growth · Urochloa brizantha (palisade grass)Positive and negative results
9 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
7 papers more in this group
See all 11 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.