adubação do algodoeiro vi: ensaios com doses crescentes de fósforo fertilizer experiments with cotton vi: phosphorus rates of application
Clicks: 7
ID: 251702
1959
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This
article has not been analysed, so there is no overall score —
reader engagement is measured and shown alongside.
Reader Engagement
Popular Article
1.8
/100
7 views
5 readers
AI Quality Assessment
Not analyzed
Readership in this journal
PopularRanked #189 of 206 articles by views in revista espanola de salud publica
Most read
Least read
Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 206 in total.
Mint this article as an NFT
Not yet mintedCreate a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.
5
SUSD
one-off · no wallet required
Abstract
Neste artigo os autores apresentam os resultados obtidos em 13 ensaios de adubarão do algodoeiro com doses crescentes de fósforo, empregadas sòzinhas ou na presença de azôto e potássio. Os ensaios foram conduzidos entre 1943-44 e 1947-48 em diferentes localidades da zona algidoeira do Estado de São Paulo, abrangendo vários tipos de solo. Provavelmente por ter sido aplicada em contato com as sementes, a adubação com azôto e potássio reduziu o "stand" em cêrca de 50% dos casos, e seu efeito sôbre a produção, em média dêsse grupo, foi apenas um têrço do obtido no grupo em que o "stand" não sofreu tal prejuízo. Tanto na presença como na ausência de azôto mais potássio a resposta média ao fósforo foi muito boa quando se usou a dose de 40 kg/ha de P2O5, e ainda aumentou apreciàvelmente quando se passou para 80 kg/ha; mas permaneceu a mesma com a dose de 120 kg/ha. Separando os ensaios conforme os tipos de solo, o efeito do fósforo foi muito maior na terra-roxa-legítima ou misturada, decrescendo substancialmente no solo massapê-salmourão e ainda mais no arenito Bauru. Na terra-roxa êle ainda aumentou quando se passou de 80 para 120 kg/ha de P2O5. A presença de azôto mais potássio contribuiu para acentuar o efeito do fósforo na terra-roxa e no arenito Bauru, ao passo que n reduziu no massapê-salmourão, ao que parece por ter aquela adubação prejudicado o "stand" em todos os ensaios conduzidos nesse tipo de solo. Os resultados de alguns ensaios conduzidos em solos já adubados com fósforo nas culturas anteriores indicam a possibilidade de reduzirem-se as doses dêsse nutriente a serem empregadas em tais casos.
This paper reports the results obtained in 13 experiments conducted in the State of São Paulo, to study the effect of increasing rates of phosphorus application in the absence and presence of nitrogen plus potassium. The nutrients used per hectare were: 20 kilograms of N, 30 kilograms of K2O, and 40, 80 and 120 kilograms of P2O5. respeetívely in the forms of Chilean nitrate, potassium chloride and superphosphate. These materials were applied in the seed furrows just before sowing. Apparently due to the application in contact with the seed, the nitrogen plus potassium fertilization impaired the stands in about 50% of the experiments, and its effect on the yield, in the average of this group, was only 1/3 of that obtained in the group, whose stands were not damaged. The average response to phosphorus was very good with the dose of 40 kilograms of P2O5 per hectare and increased appreciably with that of 80 kilograms, but no further increase was obtained with the 120 kilograms rate of application. The effect of phosphorus was better in the "terra-roxa" soil, decreasing in the "massapê-salmourão" and especially in the "arenito Bauru". In the "terra-roxa" it still increased when the rate of application was increased up to 120 kilograms per hectare. The presence of nitrogen and potassium contributed to enhance the response to phosphorus in the "terra-roxa" and "arenito Bauru" soils, but not in the "massapê--salmourão", apparently because those nutrients damaged the stands in all of the experiments conducted on the latter type of soil. According to the prices of 1956-57 and the average of the 13 experiments the most profitable rates of P2O5 applications would be 50 and 60 kilograms per hectare, respectively n the absence and in the presence of nitrogen and potassium. These doses should be ncreased for the "terra-roxa" and reduced for the "arenito Bauru" soils. For the "massapê-salmourão" soil, in view of what happened to the stands the dose to be used in the presence of nitrogen plus potassium cannot be estimated; in the absence of these nutrients it should be of 50 kilograms. The results of limited number of experiments indicate the possibility of reducing the doses of phosphorus for soils fertilized with it in the previous crops.
This paper reports the results obtained in 13 experiments conducted in the State of São Paulo, to study the effect of increasing rates of phosphorus application in the absence and presence of nitrogen plus potassium. The nutrients used per hectare were: 20 kilograms of N, 30 kilograms of K2O, and 40, 80 and 120 kilograms of P2O5. respeetívely in the forms of Chilean nitrate, potassium chloride and superphosphate. These materials were applied in the seed furrows just before sowing. Apparently due to the application in contact with the seed, the nitrogen plus potassium fertilization impaired the stands in about 50% of the experiments, and its effect on the yield, in the average of this group, was only 1/3 of that obtained in the group, whose stands were not damaged. The average response to phosphorus was very good with the dose of 40 kilograms of P2O5 per hectare and increased appreciably with that of 80 kilograms, but no further increase was obtained with the 120 kilograms rate of application. The effect of phosphorus was better in the "terra-roxa" soil, decreasing in the "massapê-salmourão" and especially in the "arenito Bauru". In the "terra-roxa" it still increased when the rate of application was increased up to 120 kilograms per hectare. The presence of nitrogen and potassium contributed to enhance the response to phosphorus in the "terra-roxa" and "arenito Bauru" soils, but not in the "massapê--salmourão", apparently because those nutrients damaged the stands in all of the experiments conducted on the latter type of soil. According to the prices of 1956-57 and the average of the 13 experiments the most profitable rates of P2O5 applications would be 50 and 60 kilograms per hectare, respectively n the absence and in the presence of nitrogen and potassium. These doses should be ncreased for the "terra-roxa" and reduced for the "arenito Bauru" soils. For the "massapê-salmourão" soil, in view of what happened to the stands the dose to be used in the presence of nitrogen plus potassium cannot be estimated; in the absence of these nutrients it should be of 50 kilograms. The results of limited number of experiments indicate the possibility of reducing the doses of phosphorus for soils fertilized with it in the previous crops.
| Reference Key |
ramos1959bragantiaadubao
Use this key to autocite in the manuscript while using
SciMatic Manuscript Manager or Thesis Manager
|
|---|---|
| Authors | ;Ismar Ramos;O. S. Neves;E. S. Freire |
| Journal | revista espanola de salud publica |
| Year | 1959 |
| DOI |
DOI not found
|
| URL | |
| Keywords |
Citations
No citations found. To add a citation, contact the admin at info@scimatic.org
Comments
No comments yet. Be the first to comment on this article.