STUDY ON THE RELATION BETWEEN METHANE EMISSION AND APPLYING DIFFERENT KINDS OF FERTILIZER AND CULTIVARS IN EARLY RICE PADDY-FIELD IN GUANGZHOU AREA

Lu Xuejuan 1 Yang Jun 1 Chen Yufen 1 Yang Chong 1 Liu Jinhong 1 Wu Shizhao 2 (1 College of Biotechnology, South China Agric. Univ., Guangzhou, 510642; 2 Dept. of Agronomy, South China Agric. Univ.)

Guangzhou region; early rice; “JX 89”; “SY 63”; fertilizer application; CH 4 emission flux

Methane (CH 4) emission flux and emission pattern in early rice paddy-field in Guangzhou region were studied. Two rice varieties (“JX 89 ”and “SY 63”) were cultivated and two fertilizer, treatments were given: Treatment 1-manure plus chemical fertilizer, Treatment 2-chemical fertilizer only. The results indicated that CH 4 emission flux in “JX 89” field was 8.1 mg/(m 2·h) in treatment 1 and 1.2 mg/(m 2·h) in treatment 2 respectively.CH 4 emission flux in “SY 63” field was 4.6 mg/(m 2·h) in tratment 1 and 2.5 mg/(m 2·h) in treatment 2 respectively. Under the same fertilizer application and rotational irrigation condition, two rice varieties showed different CH 4 emission flux.CH 4 emission flux in “JX89” field and “SY63” field was in the ratio of 1.76 to 1 in treament 1 and 1 to 2.1 in treament 2. Two rice varieties had a CH 4 emission peak in early, middle and later stages of rice growth in treatment 1 respectively. While in treatment 2, two rice varieties showed a CH 4 emisssion peak in early and later stages.