Response and economic feasibility of maize (Zea mays L.) to P fertilization in acidic Alfisols of North-western Ethiopia

Environmental Systems Research

Table 1 Locations and some chemical and physical characteristics of soils of the experimental sites

Site No.	Altitude (meters above sea level)	Geographic position	Slope (%)	Bray-2 P (mg kg⁻¹)	pH in H₂O (1:2.5)	Particle size (%)			Textural class
Site No.	Altitude (meters above sea level)	Geographic position	Slope (%)	Bray-2 P (mg kg⁻¹)	pH in H₂O (1:2.5)	Sand	Silt	Clay	Textural class
1	2240.0	11°17.2′N 37°28.9′E	3.8	3.42	4.91	7	25	68	Clay
2	2243.1	11°17.3′N 37°28.8′E	2.6	2.55	5.21	5	25	70	Clay
3	2348.8	11°14.3′N 37°30.7′E	0.3	3.82	5.00	7	21	72	Clay
4	2347.9	11°14.2′N 37°30.9′E	2.3	2.81	5.35	13	17	70	Clay
5	1897.3	11°44.0′N 37°30.8′E	5.4	10.80	5.40	15	29	56	Clay
6	1918.0	11°44.7′N 37°31.9′E	5.1	3.13	4.73	5	17	78	Clay
7	1955.8	11°45.7′N 37°32.4′E	3.1	8.02	4.99	7	27	66	Clay
8	1969.8	11°46.8′N 37°33.2′E	2.3	10.73	4.83	9	27	64	Clay
9	1916.8	11°44.4′N 37°31.7′E	8.1	11.41	5.26	55	21	24	Sandy clay loam
10	2048.7	11°24.8′N 37°24.8′E	1.1	9.43	5.25	9	25	66	Clay
11	2067.6	11°25.0′N 37°07.9′E	3.5	7.59	5.25	15	49	36	Silty clay loam
12	2039.8	11°24.8′N 37°07.4′E	0.2	6.66	5.05	9	25	66	Clay
13	2038.9	11°24.6′N 37°07.1′E	0.3	6.48	5.13	11	23	66	Clay
14	2002.7	11°21.6′N 36°58.1′E	1.6	10.96	5.01	13	23	64	Clay
15	1900.0	10°80.0′N 36°85.0′E	5.0	7.96	5.75	11	21	68	Clay
16	2150.7	10°42.7′N 37°05.6′E	1.8	16.04	5.78	15	25	60	Clay
17	2106.3	10°42.2′N 37°06.3′E	5.2	9.48	5.43	9	21	70	Clay
18	1897.9	10°40.8′N 37°16.4′E	2.3	9.48	5.63	11	23	66	Clay
19	1888.4	10°40.5′N 37°16.4′E	2.9	4.14	5.42	11	23	66	Clay
20	1882.0	10°40.9′N 37°19.0′E	0.6	2.54	5.28	11	23	66	Clay