adubação da batata-doce em são paulo parte: iii - métodos de aplicação de npk e estêrco fertilizer experiments with sweet potatoes: iii - trials on the placement of npk and manure
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1962
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Abstract
Neste artigo são relatadas nove experiências sôbre a localização de adubos na cultura de batata-doce, realizadas entre 1943-44 e 1946-47, sendo quatro com NPK (60-100-40 kg/ha de N-P2O5-K2O) e cinco com estêrco. Em dois dos ensaios com NPK, conduzidos em Tupi Paulista (um dêles repetido por três anos no mesmo local), a adubação foi mais eficiente quando misturada com a terra dos camalhões do que aplicada sob eles ou em sulcos feitos em seus cumes. Nos outros dois, realizados em Campinas, a aplicação sob os camalhões se mostrou melhor, em média, mas os resultados variaram muito. Tratando-se de assunto que depende de muitos fatôres, inclusive das condições meteorológicas, os autores encarecem a necessidade de se continuarem as experiências, e, tendo discutido as vantagens e desvantagens dos métodos estudados, sugerem a inclusão, em futuros planos, do aplicação de P e K em sulcos laterais às mudas e de N em cobertura. Nas cinco experiências com estêrco, tôdas anuais e executadas em três localidades, seu espalhamento entre os camalhões se mostrou, em regra, inferior à aplicação sob os camalhões ou de mistura com o solo dêstes. Dos dois últimos métodos, o primeiro foi superior em três ensaios, igual em um e inferior no outro. As observações feitas indicam que, em geral, o estêrco deve ser colocado sob os camalhões.
This paper reports the results of nine experiments conducted in the State of Sao Paulo on methods of application of NPK and manure for sweet potatoes (Ipomoea batatas Lam.). In two of the four trails with NPK, better results were obtained where it was broadcast before ridging than where it was placed in o furrow either under or on the top of the ridges. In the other two, the placement under the ridges showed better in the average, but the yearly results varied considerably. As the suitability of different methods of application depends on many factors, especially on the weather, the authors point to the need of farther trials and, after discussing the advantages and disadvantages of the methods studied, they suggest for the next project the inclusion of side-placement of the phosphorus, potosh and part of the nitrogen doses, the greater portion of the latter being top-dressed two to four weeks after planting. In the five trials with manure, its application between the ridges was, as a rule, inferior to both the placement under the ridges and broadcasting before ridging. Of the two last methods, the former gave better average results, but there were some indications that the latter would be more suitable either for heavy or for very light soils, in order that the organic matter improves the physical conditions of a larger volume of the soils.
This paper reports the results of nine experiments conducted in the State of Sao Paulo on methods of application of NPK and manure for sweet potatoes (Ipomoea batatas Lam.). In two of the four trails with NPK, better results were obtained where it was broadcast before ridging than where it was placed in o furrow either under or on the top of the ridges. In the other two, the placement under the ridges showed better in the average, but the yearly results varied considerably. As the suitability of different methods of application depends on many factors, especially on the weather, the authors point to the need of farther trials and, after discussing the advantages and disadvantages of the methods studied, they suggest for the next project the inclusion of side-placement of the phosphorus, potosh and part of the nitrogen doses, the greater portion of the latter being top-dressed two to four weeks after planting. In the five trials with manure, its application between the ridges was, as a rule, inferior to both the placement under the ridges and broadcasting before ridging. Of the two last methods, the former gave better average results, but there were some indications that the latter would be more suitable either for heavy or for very light soils, in order that the organic matter improves the physical conditions of a larger volume of the soils.
| Reference Key |
camargo1962bragantiaadubao
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|---|---|
| Authors | ;A. Paes de Camargo;E. S. Freire |
| Journal | revista espanola de salud publica |
| Year | 1962 |
| DOI |
10.1590/S0006-87051962000100036
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