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Figure 1.
Working principle of scanning electron microscope with energy dispersive X-ray spectroscopy analysis. (Adopted from Inkson[26]).
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Figure 2.
Variation of Gliricidia sepium biochar nutrient content with different pyrolysis temperatures. (a) Biochar yield, (b) C content, (c) O content, (d) N content, (e) P content, (f) K content, (g) Ca content, (h) Mg content, (i) S content, (j) Na content, (k) Cl content, (l) Si content. Means with different letters represent significant differences at p < 0.05 level.
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Figure 3.
Scanning electron microscopy (SEM) micrographs of Gliricidia sepium biochar produced at 400 °C. (a) Under ×250 magnification, (b) Under ×500 magnification, (c) Under ×1,000 magnification, (d) Under ×3,000 magnification.
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Figure 4.
Graphical display of the correlation matrix, using the 'corrplot' package of R-software. Red color indicates the negative correlations between shown variables; blue color indicates the positive correlations; white color indicates no correlation. The areas of the squares show the absolute value of corresponding correlation coefficients. Parameters covered by blue lines show similar correlation variation patterns.
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