Effects of Different Rates of Poultry Manure and Split Applications of Urea Fertilizer on Soil Chemical Properties, Growth, and Yield of Maize

Table 1

Initial soil characteristics at the sites before experimentation.

Property	Site I	Site II	Poultry manure
Sand (%)	82.4	61.4	ND
Silt (%)	3.28	17.3	ND
Clay (%)	14.32	21.3	ND
Textural class	Sandy loam	Sandy loam
Organic C (%)	1.65	1.24	1.76
pH (water)	5.78	5.60	6.80
Total N (%)	0.18	0.14	2.42
Available P (mg kg^−1)	6.56	5.46	4.20
Exchangeable K (cmol kg^−1)	0.36	0.48	0.48
Exchangeable Ca (cmol kg^−1)	2.10	2.30	0.64
Exchangeable Mg (cmol kg^−1)	0.75	0.50	0.34