Evaluation of Soil Quality in Arid Western Fringes of the Nile Delta for Sustainable Agriculture

Table 7

Distribution of index area grades across different soil quality index methods.

Indicator datasets	SQI model	Statistic	Soil quality grade
			I (very high)	II (high)	III (moderate)	IV (low)	V (very low)
TDS	SQI-A	Min	0.00	13.81	29.73	12.34	0.12
		Max	3.52	31.00	44.69	35.82	3.53
		Mean	1.77	23.70	39.69	23.61	1.52
	SQI-W	Min	2.80	18.00	37.77	3.31	0.00
		Max	5.75	42.19	49.72	18.87	0.44
		Mean	4.31	35.13	42.00	8.77	0.09
	SQI-N	Min	0.00	16.89	36.26	12.11	0.11
		Max	2.84	25.32	51.37	28.08	1.52
		Mean	0.84	22.02	46.64	19.88	0.91
MDS	SQI-A	Min	0.00	13.93	19.48	0.17	0.00
		Max	6.08	63.00	46.89	33.35	0.17
		Mean	2.44	45.74	33.82	8.26	0.03
	SQI-W	Min	0.01	12.04	29.75	0.40	0.00
		Max	3.12	58.46	46.62	36.55	0.08
		Mean	1.00	41.22	38.09	9.96	0.02
	SQI-N	Min	0.00	1.94	18.28	0.00	0.00
		Max	3.94	58.32	47.27	67.42	2.65
		Mean	1.53	37.40	34.99	15.83	0.55
EDS	SQI-A	Min	0.00	13.20	31.68	13.11	0.00
		Max	5.88	28.84	46.52	37.50	4.04
		Mean	1.57	21.78	40.55	25.10	1.30
	SQI-W	Min	0.00	12.54	37.38	12.64	0.00
		Max	6.78	28.33	47.81	28.81	6.08
		Mean	1.78	20.37	42.97	22.61	2.56
	SQI-N	Min	0.00	9.14	38.78	16.33	0.00
		Max	5.67	31.15	53.09	36.11	3.12
		Mean	1.43	22.63	43.12	22.41	0.70