Some of the mathematical steps in Example 5.2 are omitted. Derive Eqs. (5.14), (5.17), and (5.18).

Data From Example 5.2:-

Figure 5.10:-

Data From Eqs. 5.14 , 5.17, and 5.18:-

Transcribed Image Text:

Herbicides such as 2,4-dichlorophenoxyacetic acid (2,4-D) are commonly used for killing unwanted broadleaf weeds while leav- ing the desired crop (usually grass) to grow unmolested. However, herbicides spread on soil are easily lost due to leaching, volatiliza- tion, or biodegradation. Only a portion of the herbicide is used in killing weeds. An agrochemical company wants to develop a controlled-release granule with the active ingredient uniformly dis- persed within a polymeric matrix (Figure 5.10). The controlled-release granule should release the herbicide at a fast rate at the beginning to kill weeds quickly and at a lower rate thereafter to retard the regrowth of the weeds for a long period of time.