Fig 1.
Slump test of paddy loam soil.
Table 1.
Factors and level of Plackett-Burman test.
Table 2.
Scheme and result of Plackett-Burman test.
Table 3.
Significance analysis of parameters in the Plackett-Burman test.
Table 4.
Scheme and results of steepest ascent test.
Table 5.
Factor and codes of the Box-Behnken test.
Table 6.
Scheme and result of the Box-Behnken test.
Table 7.
Variance analysis of regression model.
Fig 2.
Influence of interactions of factors on slump error.
Fig 3.
Result of simulation test and actual test.