Effect of Continuous Agriculture of Grassland Soils of the Argentine Rolling Pampa on Soil Organic Carbon and Nitrogen

Table 6

Measured C₀ (N₀), annual C (N) additions, 𝑚 (𝑚_N), C_max (N_max),and C_eq (N_eq) at equilibrium.

Crop sequence	C0	m	Cmax	Ceq
	Mg ha^−1	Mg ha^−1 year^−1	Mg ha^−1
SS	40.5 (2)	2.8 (0.6 )	0.47	37.9
MM	41.0 (2)	4.2 (1.8)	0.55	38.9
W/S-M	45.3 (0.8)	4.8 (0.8)	0.67	40.4
	N0	𝑚N	Nmax	Neq
	Mg ha^−1	Mg ha^−1 year^−1	Mg ha^−1
SS	4.05 (0.2)	0.068 (0.01)	0.057	3.3
MM	4.20 (0.2)	0.074 (0.03)	0.061	3.55
W/S-M	4.33 (0.1)	0.090 (0.01)	0.076	3.71

C₀ (N₀): initial soil C (N) stock; m (𝑚_N): annual C (N) addition; C_max (N_max): maximum humified C (N) stock; C_eq (N_eq): soil C (N) stock at equilibrium. SS: soybean monoculture; MM: maize monoculture; W/S-M: doubled-cropped wheat/soybean maize.