Determinação estatística do número de amostras simples de solo por área para avaliação de sua fertilidade
Palavras-chave:
análise química, amostragem inadequada, fertilidade do solo, profundidade específica, coeficiente de variaçãoResumo
This study reports the determination of the number of single samples used to constitute a compgsed sample/ha, through the statistical formula n = (t a .CV/f)2.
The number of single samples was computed for several percentages of variation around the mean at t = 5%.
The soil samples were collected form level ground, red yellow podzolic-latosol,located in Viçosa country, in the State of Minas Gerais. One hundred single samples were drawn from each area.
The sampling sites were established by using the intersec- tions of a 10 x 10 meter coordinate system. Each sample was assayed for pH, P, Ca + Mg, Al and K.
Referências
CATANI,R.A., GALLO, J.Romano, GARGANTINI,H., CONAGIN, A. Amostragem de solo para estudos de fertilidade. Bragantia. Campinas, 74(3):19-26, 1954.
JACKSON, M.L. Soil chemical analysis. Englewood Cliffs, Prentice-Hall, 1958. 498 p.
PETERSEN,R.G. § GALVIN,L.D. Sampling. In: BLACK,C.A. ed.Methods of soil analysis. Madison, American Society of Agronomy, 1965, p. 54-72.
