Table 1: Solubility, IR, and XRD characteristics of the slow-release fertilizer.

Chemical component % of total solubilized inIR absorption in wavenumber (cm−1)XRD peaks
Water0.33 M citric acid0.005 M DTPAWavenumber
(cm−1)
Absorbance Basal spacing ( )Intensity (I)

ZnND93.783.9 447.7 
544.3 
1073.1 
1280.6 
1450.7 
1656.0 
2375.1 
3238.4
42 
40 
36 
40 
38 
41 
41 
35
6.29 
5.33 
4.67 
4.41 
3.76 
3.08 
2.66 
2.62 
2.38 
2.34 
2.24 
1.60
16 
56 
15 
15 
50 
100 
16 
10 
13 
8 
8 
26
FeND93.291.8
MnND90.980.1
Cu1.896.891.3
P8.4