Table 4. Grain protein content of barley and soil nitrogen content two months after incorporating the second crop, according to the second crop and its stage of incorporation.

Stage of incorporation	Second crop	GPC (%)		N.2 (kg/ha)
Flower	Buckwheat	9.4	b	49.5	b
	Caraway	9.5	b	45.3	bc
	Faba bean	10.2	a	60.6	a
	Hemp	9.3	b	46.0	bc
	White lupin	9.6	b	65.7	a
After harvest	Barley	9.4	b	37.3	c
	Buckwheat	9.4	b	23.9	d
	Faba bean	9.5	b	20.9	d
	Hemp	9.3	b	21.7	d

Data show means across first crops and sites.

Within a column, means followed by the same letter are not significantly different (P < 0.05) by the LSD test.