Table 2 Particle roundness and SSA of different treatment.

From: Water Polishing improved controlled-release characteristics and fertilizer efficiency of castor oil-based polyurethane coated diammonium phosphate

Treatment

Roundness

Change VS Control (%)

SSA (m2/g)

Change VS Control (%)

Control

0.918

—

0.02139

—

WAT1

0.931

1.42

0.01288

−39.78

WAT2

0.932

1.53

0.01096

−48.76

WAT3

0.909

0.11

0.02017

−5.70

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