Effects of Deep Tillage and Straw Returning on Soil Microorganism and Enzyme Activities
Figure 5
Effects of tillage and straw returning on soil phosphatase activity. Different small letters indicated significant difference at according to Duncan’s test. CT represented conventional tillage, moldboard ploughed to a depth of 20 cm, and straw was returned. DT represented deep tillage moldboard ploughed to a depth of 30 cm and straw was returned. DNT represented deep tillage moldboard ploughed to a depth of 30 cm and straw was removed.
