Table 1. Effect of grass species intercrops on bean leaf chlorophyll intensity (SPAD units), bean tissue and soil nutrients (mg kg⁻¹) and dry bean grain yield (tons ha⁻¹) in 2009 and 2010 near Lingle, WY.

Year		SPAD	Bean tissue Fe		Bean tissue Zn		Bean tissue Mn		Soil Zn	Soil NO3-N	Dry bean
		2-4TL	2-4TL	8-16TL	2-4TL	8-16TL	2-4TL	8-16TL	2-4TL	2-4TL	yield
2009	Bare soil	—	—	—	—	—	—	—	1.78ab	23.85ab	—
	Bean monoculture	29.68b†	814a	910a	29a	40a	115a	140a	1.81ab	29.20a	2.3a
	Bean + oat	37.20a	760ab	382c	22b	42a	97b	98c	1.67ab	17.85bc	1.5bc
	Bean + wheat	37.84a	739ab	353c	22b	40a	88b	81c	2.10a	15.94c	1.3c
	Bean + corn	36.89a	627b	620b	23b	42a	87b	105b	1.80ab	18.97bc	1.6bc
	Bean + ryegrass	36.30a	740ab	577 b	24b	39a	97b	97c	1.41b	23.64abc	1.7ab
									2TL to Flowering	2TL to Flowering
2010	Bare soil	—	—	—	—	—	—	—	2.21	21.76ab	—
	Bean monoculture	25.40b	632‡	234	76	103	65	63	2.27	26.30a	2.8
	Bean + oat	33.68a	490	315	69	58	60	49	2.06	14.48c	2.8
	Bean + wheat	32.34a	591	241	84	57	70	46	1.99	13.81c	2.9
	Bean + corn	32.73a	645	239	57	61	61	45	2.09	17.29bc	2.5
	Bean + ryegrass	32.89a	600	280	74	59	69	48	2.16	19.58bc	3.0

^†Means within a column and year followed by the same letter are not statistically different (alpha  = 0.05).

^‡Means without letters were not significantly different from other treatments within a year.