Intercropping of Gramineous Pasture Ryegrass (Lolium perenne L.) and Leguminous Forage Alfalfa (Medicago sativa L.) Increases the Resistance of Plants to Heavy Metals

Table 5

The soil physical-chemical properties under different treatments.

Treatment	pH	SOM	TN	NO3^−-N	NH4^+-N	Available P	Available K
		(g·kg^−1)	(g·kg^−1)	(mg·kg^−1)	(mg·kg^−1)	(mg·kg^−1)	(mg·kg^−1)
Control	8.2 ± 0.01^b	24.6 ± 0.8^b	1.49 ± 0.01^a	12.0 ± 1.60^a	2.66 ± 0.24^b	0.61 ± 0.15^a	29.5 ± 0.1^a
MR	8.7 ± 0.10^a	25.8 ± 1.8^ab	1.09 ± 0.10^b	11.7 ± 2.23^ab	2.65 ± 0.16^bc	0.58 ± 0.05^a	22.9 ± 0.6^b
MA	8.6 ± 0.10^a	26.4 ± 0.7^a	1.14 ± 0.01^b	9.0 ± 2.15^b	2.94 ± 0.07^ab	0.36 ± 0.10^b	22.4 ± 0.2^b
IRA	8.5 ± 0.07^a	27.1 ± 0.9^a	1.16 ± 0.01^b	13.5 ± 2.06^a	3.20 ± 0.34^a	0.49 ± 0.09^ab	23.8 ± 0.8^b

Note. Values are the means ± standard error (). Means followed by the same letter in the same column are not significantly different at . MR: monoculture ryegrass; MA: monoculture alfalfa; IRA: intercropping of ryegrass and alfalfa.