Abstract
With the objective to evaluate the effects of nitrogen levels (0, 40, 80, 120 and 160 kg of N ha-1) on green dry matter (GDM) yield and morphogenetic and structural characteristics and nitrogen nutrition index (NNI) of Brachiaria brizantha cv. Piatã, was installed an experiment under field conditions in Roraima´s savannas. Nitrogen fertilization increased significantly (P<0.05) GDM yields, number of tillers, number of leaves tiller-1, average leaf size, leaf area index, leaf senescence rate, leaf appearance and elongation rates. Maximum GDM yields, leaf elongation rates, leaf length and number of leaves tiller-1 were obtain with the application of 145.9; 118.2; 108.9 and 133.6 kg of N ha-1, respectively. Nitrogen nutrition index alone with 120 or 160 kg N application was higher than the grass N internal critical level. The NNI, efficiency of utilization and apparent N recovery were inversely proportional to the increased N levels.
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Claims 9
Claim · model-written summary
Nitrogen fertilization significantly increased green dry matter yield.
- Taxon
- Brachiaria brizantha cv. Piatã
Urochloa brizanthae1 - Treatment
- Nitrogen fertilizatione0
- Outcome
- GDM yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization increased significantly (P<0.05) GDM yields”
e1“Brachiaria brizantha cv. Piatã”
Claim · model-written summary
Nitrogen significantly increased tiller number, leaves per tiller, leaf size and leaf area index.
- Taxon
- Brachiaria brizantha cv. PiatãUrochloa brizanthae1
- Treatment
- Nitrogen fertilizatione0
- Outcome
- number of tillers, number of leaves tiller-1, average leaf size, leaf area indexe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization increased significantly (P<0.05) GDM yields, number of tillers, number of leaves tiller-1, average leaf size, leaf area index”
e1“Brachiaria brizantha cv. Piatã”
Claim · model-written summary
Nitrogen significantly increased leaf senescence, appearance and elongation rates.
- Taxon
- Brachiaria brizantha cv. PiatãUrochloa brizanthae1
- Treatment
- Nitrogen fertilizatione0
- Outcome
- leaf senescence rate, leaf appearance and elongation ratese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization increased significantly (P<0.05) GDM yields, number of tillers, number of leaves tiller-1, average leaf size, leaf area index, leaf senescence rate, leaf appearance and elongation rates”
e1“Brachiaria brizantha cv. Piatã”
Claim · model-written summary
Maximum green dry matter yield occurred at 145.9 kg N ha-1.
- Taxon
- Brachiaria brizantha cv. PiatãUrochloa brizanthae1
- Treatment
- 145.9e0
- Outcome
- GDM yieldse0
- Direction
- Maximume0
- Value
- 145.9e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum GDM yields, leaf elongation rates, leaf length and number of leaves tiller-1 were obtain with the application of 145.9; 118.2; 108.9 and 133.6 kg of N ha-1, respectively”
e1“Brachiaria brizantha cv. Piatã”
Claim · model-written summary
Maximum leaf elongation rate occurred at 118.2 kg N ha-1.
- Taxon
- Brachiaria brizantha cv. PiatãUrochloa brizanthae1
- Treatment
- 118.2e0
- Outcome
- leaf elongation ratese0
- Direction
- Maximume0
- Value
- 118.2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum GDM yields, leaf elongation rates, leaf length and number of leaves tiller-1 were obtain with the application of 145.9; 118.2; 108.9 and 133.6 kg of N ha-1, respectively”
e1“Brachiaria brizantha cv. Piatã”
Claim · model-written summary
Maximum leaf length occurred at 108.9 kg N ha-1.
- Taxon
- Brachiaria brizantha cv. PiatãUrochloa brizanthae1
- Treatment
- 108.9e0
- Outcome
- leaf lengthe0
- Direction
- Maximume0
- Value
- 108.9e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum GDM yields, leaf elongation rates, leaf length and number of leaves tiller-1 were obtain with the application of 145.9; 118.2; 108.9 and 133.6 kg of N ha-1, respectively”
e1“Brachiaria brizantha cv. Piatã”
Claim · model-written summary
Maximum leaves per tiller occurred at 133.6 kg N ha-1.
- Taxon
- Brachiaria brizantha cv. PiatãUrochloa brizanthae1
- Treatment
- 133.6 kg of N ha-1e0
- Outcome
- number of leaves tiller-1e0
- Direction
- Maximume0
- Value
- 133.6 kg of N ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum GDM yields, leaf elongation rates, leaf length and number of leaves tiller-1 were obtain with the application of 145.9; 118.2; 108.9 and 133.6 kg of N ha-1, respectively”
e1“Brachiaria brizantha cv. Piatã”
Claim · model-written summary
At 120 or 160 kg N, the nitrogen nutrition index exceeded the internal critical N level.
- Taxon
- Brachiaria brizantha cv. PiatãUrochloa brizanthae1
- Treatment
- 120 or 160 kg N applicatione0
- Outcome
- Nitrogen nutrition indexe0
- Direction
- highere0
- Comparator
- grass N internal critical levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen nutrition index alone with 120 or 160 kg N application was higher than the grass N internal critical level”
e1“Brachiaria brizantha cv. Piatã”
Claim · model-written summary
Nitrogen nutrition index, utilization efficiency and apparent N recovery declined with increasing N.
- Taxon
- Brachiaria brizantha cv. PiatãUrochloa brizanthae1
- Treatment
- increased N levelse0
- Outcome
- NNI, efficiency of utilization and apparent N recoverye0
- Direction
- inversely proportionale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The NNI, efficiency of utilization and apparent N recovery were inversely proportional to the increased N levels”
e1“Brachiaria brizantha cv. Piatã”
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See all 23 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.