Table 3 Results of generalized linear models showing the effects of biochar, fertilizer and inoculant (and their interactions) on soil chemical parameters measured in a greenhouse experiment with two forage grasses (Panicum and Brachiaria). PCA1 and PCA2 are the first two axes of a Principal Components Analysis summarizing the variation in soil parameters, explaining 50.1 and 9.1% of the original variation in soil parameters, respectively. Est – estimated coefficient; SE – Standard error of the estimate. Significant p-values are highlighted in bold.
From: Biochar amendment improves degraded pasturelands in Brazil: environmental and cost-benefit analysis
Treatment | Axis PCA1 | Axis PCA2 | ||||||
|---|---|---|---|---|---|---|---|---|
Est. | SE | t | p | Est. | SE | t | p | |
Forage grass: Brachiaria | ||||||||
Intercept | 4.351 | 0.574 | 7.58 | 0.000 | 0.437 | 0.395 | 1.11 | 0.277 |
Biochar | −6.285 | 0.812 | −7.74 | 0.000 | −1.640 | 0.559 | −2.94 | 0.006 |
Fertilizer | −0.632 | 0.812 | −0.78 | 0.442 | 0.904 | 0.559 | 1.62 | 0.116 |
Inoculant | −0.997 | 0.812 | −1.23 | 0.228 | 0.938 | 0.559 | 1.68 | 0.103 |
Biochar*Fertilizer | −1.399 | 1.148 | −1.22 | 0.232 | 0.365 | 0.790 | 0.46 | 0.647 |
Biochar*Inoculant | −0.188 | 1.148 | −0.16 | 0.871 | 0.426 | 0.790 | 0.54 | 0.593 |
Fertilizer*Inoculant | 0.204 | 1.148 | 0.18 | 0.860 | −0.970 | 0.790 | −1.23 | 0.228 |
Biochar*Fertilizer*Inoculant | 1.781 | 1.624 | 1.10 | 0.281 | −0.077 | 1.117 | −0.07 | 0.945 |
Forage grass: Panicum | ||||||||
Intercept | 3.318 | 0.651 | 5.10 | 0.000 | −3.198 | 0.494 | −6.48 | 0.000 |
Biochar | −6.882 | 0.920 | −7.48 | 0.000 | 2.278 | 0.698 | 3.26 | 0.005 |
Fertilizer | −1.197 | 0.920 | −1.30 | 0.212 | 2.774 | 0.698 | 3.97 | 0.001 |
Biochar*Fertilizer | 0.728 | 1.301 | 0.56 | 0.584 | −1.177 | 0.987 | −1.19 | 0.251 |
