3.2.1 pH, EC and ESP
Soil pH, EC and ESP of N addition
treatments decreased significantly compared with those of non-N addition
treatment when N addition rate was more than 90 kg
ha-1(P <0.05), and three indexes showed a
downward trend with the increase of N addition rates (Fig.4). Compared
with the treatment without N addition, soil pH of the N addition
treatments with 90-210 kg ha-1 decreased by 0.71-1.19
units, soil EC decreased by 34.4%-67.2%, and soil ESP decreased by
55.7%-65.3%, respectively. In MSSL of L. chinensis , N addition
can reduce effectively salinity and alkalinity of 0-20 cm soil.