3.2. Topsoil P, SOC and soil total N balance
Phosphorus balance differed in the two growing seasons. The balance of soil total P and inorganic P in both B and M treatments was negative in 2009 and positive in 2010 (Table 3). In contrast, available P in both treatments was positive in 2009 and negative
in 2010 (Table 3). Furthermore, the balance of soil total P, available P and inorganic P in the M treatment was significantly lower (P ≤ 0.05) than in the B treatment in 2009. Conversely, in 2010 they were significantly higher (P ≤ 0.05) (Table 3). The balance of soil total P in 2009 was significantly lower (P ≤ 0.05) than in 2010, but the balance of available P in 2009 was significantly higher (P≤0.05) than in 2010 in both treatments. The balance of inorganic P in 2009 was significantly higher (P≤0.05) than in 2010 in the M treatment, but was not significantly different (P≤0.05) in the B treatment.