Research Article
Impact of Forage Fertilization with Urea and Composted Cattle Manure on Soil Fertility in Sandy Soils of South-Central Vietnam
Table 4
Soil chemical models in 0 to 15 cm and 15 to 25 cm strata selected from candidate fixed effects of compost (C), urea (U), compost × urea (C × U), preexperiment soil fertility for each parameter sampled at 15 to 25 cm depth (PSF), and significant interactions, with block included as a random effect.
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Where interactions were significant, only highest level interactive effect or effects are shown, although lower level terms were also in the model. Each row represents a single model for each soil depth. Percentage of residual variance explained by farm in each model is indicated. |