Abstract: Net bags which simulated straw returning to field were employed to explore the pineapple stem leaves decomposing and nutrient releasing of carbon, nitrogen, phosphorus, potassium under different ways returned to field. The results showed that pineapple stem leaves had fast decomposing speed during 0 to 30 days under different ways returned to field. Under cover with soil, cover with soil and plastic film and cover with plastic film only, the accumulated decay rate was 38.0%, 53.5%, 59.4% respectively and nutrient release was above 60% at the 30th day; after 180th returning, the decomposition rate was 96.0%, 97.5%, 95.5% respectively of the total decay and basic decomposition completely; the accumulated releasing rate of carbon, nitrogen, phosphorus, potassium was 81.2%-85.7%, 70.8%-78.6%, 74.7%-78.3%, 92.4%-92.8%, ranked as potassium > carbon > phosphorus≈nitrogen at the 240^th day and nutrient release was relatively high under casing soil. And it is suggested that using the way of casing soil and plastic film only in a short term and the way of casing soil in a long term when pineapple stem leaves to field were returned consideration of decomposition and nutrients releasing.

Key words: Pineapple stem-leaf, The way returned to field, Characteristics of decomposing, Characteristics of nutrients releasing

CLC Number: 

• S141