The effect of N fertilizer rates on agronomic parameters, yield components and yields of maize grown on 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 (%)	Organic matter (%)	pH in H₂O (1:2.5)	Particle size (%)			Soil texture
Site No.	Altitude (meters above sea level)	Geographic position	Slope (%)	Organic matter (%)	pH in H₂O (1:2.5)	Sand	Silt	Clay	Soil texture
1	2240.0	11^o17.2′N 37^o28.9′E	3.8	2.84	4.91	7	25	68	Clay
2	2243.1	11^o17.3′N 37^o28.8′E	2.6	3.35	5.21	5	25	70	Clay
3	2348.8	11^o14.3′N 37^o30.7′E	0.3	3.25	5.00	7	21	72	Clay
4	2347.9	11^o14.2′N 37^o30.9′E	2.3	1.78	5.35	13	17	70	Clay
5	1897.3	11^o44.0′N 37^o30.8′E	5.4	3.09	5.40	15	29	56	Clay
6	1918.0	11^o44.7′N 37^o31.9′E	5.1	2.66	4.73	5	17	78	Clay
7	1955.8	11^o45.7′N 37^o32.4′E	3.1	3.19	4.99	7	27	66	Clay
8	1969.8	11^o46.8′N 37^o33.2′E	2.3	3.11	4.83	9	27	64	Clay
9	1916.8	11^o44.4′N 37^o31.7′E	8.1	2.31	5.26	55	21	24	Sandy clay loam
10	2048.7	11^o24.8′N 37^o24.8′E	1.1	3.93	5.25	9	25	66	Clay
11	2067.6	11^o25.0′N 37^o07.9′E	3.5	4.22	5.25	15	49	36	Silty clay loam
12	2039.8	11^o24.8′N 37^o07.4′E	0.2	4.08	5.05	9	25	66	Clay
13	2038.9	11^o24.6′N 37^o07.1′E	0.3	4.24	5.13	11	23	66	Clay
14	2002.7	11^o21.6′N 36^o58.1′E	1.6	5.56	5.01	13	23	64	Clay
15	1900.0	10^o80.0′N 36^o85.0′E	5.0	6.06	5.75	11	21	68	Clay
16	2150.7	10^o42.7′N 37^o05.6′E	1.8	3.99	5.78	15	25	60	Clay
17	2106.3	10^o42.2′N 37^o06.3′E	5.2	4.51	5.43	9	21	70	Clay
18	1897.9	10^o40.8′N 37^o16.4′E	2.3	4.33	5.63	11	23	66	Clay
19	1888.4	10^o40.5′N 37^o16.4′E	2.9	4.12	5.42	11	23	66	Clay
20	1882.0	10^o40.9′N 37^o19.0′E	0.6	3.71	5.28	11	23	66	Clay