Aq. soins. of chitosan and inorg. salts (Na(5)P(3)O(10), K(3)PO(4), K(2)SO(4), NH(4)H(2)PO(4)) (mass ratio 0.01 to 1) were spray dried under lab. conditions at 170 degrees C to prep. controlled release fertilizers (CRF). The resulted powders were studied for their structure by X-ray diffraction, IR spectroscopy and scanning electron microscopy. They showed too high dissoln. rate in H(2)O and did not meet the std. requirements for CRF