A study of burrying rice straws combined with two microbial product treatments (Bio-plant and Trichoderma) was conducted in spring rice and summer rice seasons on Red River alluvial soils of Hanoi University of Agriculture. The experiments were arranged in randomized complete block design. Research results pointed out that rice straw burrying with and without microbial product treatment led to differences in growth and development of rice plants. Observations indicate statistically significant differences in leaf area index (LAI) and dry matter accumulation, yield components and grain yield. The use of Bio-plant product combined with rice straw burrying brought higher rice yield than Trichoderma product and control (without microbial treatment, with the summer crop yield of 40.5
38.0 and 36.5 quintal/ha, respectively. The treatment of rice straws with Bio-plant product gave higher income by VND 5.2 to 6.5 millions/crop/hecta.