Abstract
The present study aimed at identifying the correct nitrogen and phosphate fertilization for the maximum productivity of Jatropha curcas plants. The study was carried out at the experimental field of the Ipameri Campus of the State University of Goias. Three-year-old physic nut plants under full production were used. After analysis of the soil classified as Oxissol, pH correction was performed in accordance with technical recommendations for the species. The experiment followed a randomized block design with a 4 × 2 factorial arrangement [four doses of N (0, 100, 200 and 300 kg/ha) and two levels of phosphate fertilization (0 and 50 kg/ha). Fertilization was made in semicircle following the crown projection, 20 cm away from the stem. The lower leaf concentration of phosphorus in plants treated with 50 kg ha-1 in relation to plants fertilized with phosphorus shows there was no deficiency in the plants that did not get phosphorus and possibly the 50 kg ha-1 represented the excess of phosphorus due to the high content of organic matter. However, the high organic matter was not sufficient to meet the demand for nitrogen due to the high demand for J. curcas for this nutrient. Seed productivity presented a significant increase in relation to nitrogen fertilization. For 3-year-old plants cultivated at a spacing of 4 × 2 m, a fertilization of 81 kg ha-1 is thus recommended. Key words: Biofuel, mineral nutrition, growth, nitrogen, phosphorus.
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Claims 6
Claim · model-written summary
Leaf phosphorus concentration was lower at 50 kg ha-1 phosphate fertilization than the stated comparison.
- Taxon
- Jatropha curcas
_tree_at_Samedha.jpg?width=60)
Jatropha curcast0 - Treatment
- 50 kg ha-1e0
- Outcome
- leaf concentration of phosphoruse0
- Direction
- lowere0
- Comparator
- plants fertilized with phosphoruse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_tree_at_Samedha.jpg?width=500)
Verbatim
e0“The lower leaf concentration of phosphorus in plants treated with 50 kg ha-1 in relation to plants fertilized with phosphorus”
t0“Jatropha curcas”
Claim · model-written summary
Plants without phosphorus were interpreted as not deficient.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- did not get phosphoruse0
- Outcome
- no deficiencye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no deficiency in the plants that did not get phosphorus”
t0“Jatropha curcas”
Claim · model-written summary
The authors suggest 50 kg ha-1 phosphate may have been excessive because of high organic matter.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- 50 kg ha-1e0
- Outcome
- excess of phosphoruse0
- Qualifier
- high content of organic mattere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“possibly the 50 kg ha-1 represented the excess of phosphorus due to the high content of organic matter”
t0“Jatropha curcas”
Claim · model-written summary
High organic matter did not meet Jatropha nitrogen demand.
- Taxon
- Jatropha curcasJatropha curcast0
- Outcome
- demand for nitrogene0
- Qualifier
- high organic matter was not sufficiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the high organic matter was not sufficient to meet the demand for nitrogen due to the high demand for J. curcas for this nutrient”
t0“Jatropha curcas”
Claim · model-written summary
Seed productivity increased significantly with nitrogen fertilization.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- nitrogen fertilizatione0
- Outcome
- Seed productivitye0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed productivity presented a significant increase in relation to nitrogen fertilization.”
t0“Jatropha curcas”
Claim · model-written summary
The authors recommend 81 kg ha-1 fertilization for three-year-old plants at 4 × 2 m spacing.
- Taxon
- Jatropha curcasJatropha curcast0
- Organ / stage
- 3-year-old plantse0
- Outcome
- fertilization of 81 kg ha-1 is thus recommendede0
- Value
- 81 kg ha-1e0
- Qualifier
- spacing of 4 × 2 me0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For 3-year-old plants cultivated at a spacing of 4 × 2 m, a fertilization of 81 kg ha-1 is thus recommended.”
t0“Jatropha curcas”
The same questions in other papers
fertilization · yield · Jatropha curcasPositive and negative results
13 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
12 papers more in this group
See all 16 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.