Biological and Physicochemical Parameters Related to the Nitrogen Cycle in the Rhizospheric Soil of Native Potato (Solanum phureja) Crops of Colombia

Table 1

Physical-chemical analysis of the soils being studied.

Farm	Agricultural management	Production	% H	pH	OC	Ca	K	Mg	Na	CEC	P	Cu	Fe	Mn	Zn	Clay	Silt	Sand	N	NH4	NO3
F1	T^1	23.38	79.10	5.6	14.5	11.1	1.44	1.67	0.28	69.3	11.7	1.43	170	3.01	3.57	10	39	51	1.08	24.5	43
F2	T^1	17.85	37.8	5.3	6.47	3.91	0.56	1.01	0.29	30.1	116	0.73	334	2.49	4.84	26	30	44	0.41	17.1	14.4
F3	T^1	18.50	40.5	4.9	7.38	3.85	2.49	1.95	0.22	28.9	116	0.97	471	4.1	5.8	24	28	48	0.52	29.5	39.4
F4	T^1	14.50	52.8	5.5	12.9	3.03	1.8	0.89	0.12	42.7	73.7	0.82	182	1.98	6.83	15	35	49	0.59	31.2	12.7
F5	T^1	16.80	29.4	5.3	6.2	3.17	2.51	1.67	0.2	22.6	107	0.83	523	2.41	5.01	31	33	35	0.39	26.1	32.6
F6	O^2	ND^3	80	5.7	13.3	6.6	2.25	2.09	0.51	48.2	69.8	1.29	105	3.94	6.79	6	19	75	0.93	11.1	15.5
F7	O^2	ND^3	62.33	6.0	9.74	5.7	1.64	1.57	0.38	43.8	49.8	0.88	97	2.89	2.71	6	27	67	0.62	11.7	7.94

AM: Agricultural Management, ¹T: traditional, ²O: organic, ³ND: not determined; production: bundles per bundle sown, %H: percentage of humidity, OC: percentage of organic carbon, Ca: calcium (mmol·100 g⁻¹), K: potasium (mmol·100 g⁻¹), Mg: magnesium (mmol·100 g⁻¹), Na: sodium (mmol·100 g⁻¹), CEC: cation-exchange capacity (meq·100 g⁻¹), P: phosphorus (mg·Kg⁻¹), Cu: copper (mg·Kg⁻¹), Fe: iron (mg·Kg⁻¹), Mn: manganese (mg·Kg⁻¹), clay: percentage of clay, silt: percentage of silt, sand: percentage of sand, N: percentage of total nitrogen, NH₄: ammonium (mg·Kg⁻¹), and NO₃: nitrate (mg·Kg⁻¹).