Resumo
This paper deals with the estimation of the residual effect of fertilizers through the use of Mitscherlich's law. The formulas and reasonings now presented are a further development of those introduced previously by PIMENTEL GOMES (2). The new formulas allow the estimation of the residual effect h in cases where the experiments are carried out in the same plots for two or three subsequent years (or crops). In an experiment analysed as an example, the residual effect of calcium hydroxide was estimated to be h = 0.423, that is, about 42%, so that one should advise the use of frequent application of small amounts of lime instead of heavy quantities used at long intervals.
A estimação do efeito residual de fertilizantes por meio da Lei de Mitscherlich* * Trabalho apresentado e aprovado no Segundo Congresso Panamericano de Agronomia, realizado em Piracicaba, de 29 de março a 6 de abril de 1954.
Frederico Pimentel Gomes
Escola Superior de Agricultura "Luiz de Queiroz" Universidade de S. Paulo - Piracicaba
ABSTRACT
This paper deals with the estimation of the residual effect of fertilizers through the use of Mitscherlich's law. The formulas and reasonings now presented are a further development of those introduced previously by PIMENTEL GOMES (2). The new formulas allow the estimation of the residual effect h in cases where the experiments are carried out in the same plots for two or three subsequent years (or crops).
In an experiment analysed as an example, the residual effect of calcium hydroxide was estimated to be h = 0.423, that is, about 42%, so that one should advise the use of frequent application of small amounts of lime instead of heavy quantities used at long intervals.
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BIBLIOGRAFIA CITADA
- 1 -PIMENTEL GOMES, F. e E. MALAVOLTA - "Pesquisas sobre a Análise Estatística de Experiências de Adubação com auxílio da lei de Mitscherlich". Anais E. S. A. "Luiz de Queiroz", vol. 8, pp. 1-14, 1951.
- 2 -PIMENTEL GOMES, F. - "The Use of Mitscherlich's Regression law in the Analysis of Experimens with Fertilizers". Biometrics, vol. 9, pp. 498-516, 1953.
Datas de Publicação
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Publicação nesta coleção
28 Set 2012 -
Data do Fascículo
1956
