Table 4 Some selected maize DRIS norms, dual ratios and variance used in the nutrient diagnosis.

Form of expression	Low yielding sub-population			High yielding sub-population			Variance ratio
Form of expression	Norms	CV (%)	σ²_low	Norms	CV (%)	σ²_high	σ²_low/ ²_high
N/Mg	8.889	158.3	197.968	8.530	33.3	8.051	24.59
N/K	3.615	319.1	133.064	4.460	37.8	0.866	153.72
N/Ca	2.869	118.0	11.452	2.420	20.9	0.257	44.64
N/P	12.126	50.5	37.532	14.199	29.8	11.142	3.37
N/Zn	0.150	219.0	0.155	0.168	37.4	0.003	50.91
Mg/K	0.403	72.1	0.084	0.627	53.7	0.031	2.72
Mg/Ca	0.384	42.2	0.026	0.481	33.4	0.011	2.49
P/Mg	0.787	126.6	0.993	0.821	39.9	0.107	9.26
S/Mg	2.358	161.9	14.569	2.497	51.3	1.643	8.87
Cu/Mg	0.210	256.4	0.289	0.177	45.7	0.007	44.37
Mn/Mg	5.345	208.5	124.179	4.730	34.6	2.681	46.32
Fe/Mg	1.524	153.2	5.456	1.571	54.0	0.718	7.59
B/Mg	0.111	242.7	0.072	0.718	47.9	0.001	60.80
K/Ca	1.189	42.7	0.257	1.609	36.1	0.160	1.61
P/K	0.307	262.1	0.648	0.332	39.8	0.009	75.97
S/K	0.705	321.5	9.049	0.936	58.3	0.169	53.58
Fe/K	0.606	312.5	3.592	0.472	72.2	0.116	30.96
P/Ca	0.258	93.7	0.059	0.337	39.3	0.009	6.76
S/Ca	0.767	123.1	0.893	0.793	51.9	0.141	6.35
Fe/Ca	0.481	115.7	0.309	0.517	36.9	0.026	11.90
B/Ca	0.026	180.0	0.004	0.041	50.3	0.000	38.42
S/P	3.377	107.2	13.092	3.383	57.1	3.563	3.67
Cu/P	0.250	61.9	0.026	0.265	43.2	0.009	2.75
Mn/P	6.976	47.1	10.814	6.431	42.8	7.582	1.43
P/Zn	0.011	277.2	0.003	0.019	43.0	0.000	72.02
Fe/P	2.074	51.6	1.145	2.122	42.9	0.754	1.52
B/P	0.142	53.1	0.006	0.094	48.1	0.002	2.79
S/Zn	0.045	158.5	0.005	0.046	54.6	0.001	9.48
Fe/Zn	2.811	164.7	2.930	2.811	71.3	4.023	5.79
B/Zn	0.245	307.9	0.571	0.313	55.6	0.005	117.97
B/Fe	0.035	41.6	0.001	0.054	54.4	0.001	1.12

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