Slow Release Fertilzier is slowly effective.  However It can't control the effective time.

CRF  is  Controlled Release Fertilizer.   This is one of Slow Release Fertilizer.

CRF can control the effective time, 100days, 120days, 140days and else.

YouTube Video click here

Controlled Release Fertilzier be different effective time for each location.

Because the effective time/releasing time be changed by temperature.

(temperature is different each location)

Therefore we simulate the Fertilizer Releasing at your place, if you want.

Following is our Simulator software, and simulated at Shanghai.

Would you please feel free to contact us.