Abstract
The relationship between growth and fertilizer nitrogen recovery by perenial crops such as coffee is poorly understood and improved understanding of such relations is important for the establishment of rational crop management practices. In order to characterize the growth of a typical coffee crop in Brazil and quantify the recovery of 15N labeled ammonium sulfate, and improve information for fertilizer management practices this study presents results for two consecutive cropping years, fertilized with 280 and 350 kg ha-1 of N, respectively, applied in four splittings, using five replicates. Shoot dry matter accumulation was evaluated every 60 days, separating plants into branches, leaves and fruits. Labeled sub-plots were used to evaluate N-total and 15N abundance by mass spectrometry. During the first year the aerial part reached a recovery of 71% of the fertilizer N applied up to February, but this value was reduced to 34% at harvest and 19% at the beginning of the next flowering period due to leaf fall and fruit export. For the second year the aerial part absorbed 36% of the fertilizer N up to March, 47% up to harvest and 19% up to the beginning of the next flowering period. The splitting into four applications of the used fertilizer rates was adequate for the requirements of the crop at these growth stages of the coffee crop.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
First-year aerial fertilizer N recovery reached 71% by February.
- Organ / stage
- aerial parte0
- Outcome
- recovery of 71% of the fertilizer Ne0
- Value
- 71%e0
- Qualifier
- up to Februarye0
CoffeaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“coffee plant”
e0“During the first year the aerial part reached a recovery of 71% of the fertilizer N applied up to February”
Claim · model-written summary
First-year aerial fertilizer N recovery declined to 34% at harvest.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“coffee plant”
e0“this value was reduced to 34% at harvest”
Claim · model-written summary
First-year aerial fertilizer N recovery declined to 19% at the next flowering period.
- Outcome
- 19% at the beginning of the next flowering periode0
- Value
- 19%e0
- Qualifier
- due to leaf fall and fruit exporte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“coffee plant”
e0“19% at the beginning of the next flowering period due to leaf fall and fruit export”
Claim · model-written summary
Second-year aerial fertilizer N absorption was 36% by March.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“coffee plant”
e0“For the second year the aerial part absorbed 36% of the fertilizer N up to March”
Claim · model-written summary
Second-year aerial fertilizer N absorption was 47% by harvest.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“coffee plant”
e0“47% up to harvest”
Claim · model-written summary
Second-year aerial fertilizer N absorption was 19% by the next flowering period.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“coffee plant”
e0“19% up to the beginning of the next flowering period”
Claim · model-written summary
Four fertilizer applications at the tested rates were adequate for the coffee crop stages.
- Outcome
- splitting into four applications of the used fertilizer ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“coffee plant”
e0“The splitting into four applications of the used fertilizer rates was adequate for the requirements of the crop at these growth stages of the coffee crop”