Bioconversion of Paddy Straw and Biofertilizer for Sustainnable Rice Based Cropping Systems in Mekong Delta

Abstract

The demonstrated models were carried out on three different provinces of Mekong Delta viz., An Giang, Can Tho and Long An at different 30 households to study the effect of composted paddy straw by Trichoderma sp and nitrogen fixing bacteria (Gluconacetobacter diazotrophicus and Bradyrhizobium japonicum/Bradyrhizobium sp.) and phosphate solubilizing bacteria (Pseudomonas syringae) under different soil conditions of Mekong Delta on rice – upland crops (soybean and groundnut) - rice cropping systems from Summer – Fall season 2006. The recommended models was combined at low level of inorganic nitrogen fertilizer levels (only 25 kg N/ha) + composted paddy straw and biofertilizer in comparison to conventional farmers’ fertilizer level (100 N - 60 P2 O5 – 30 K2 O kg/ha). The results showed that application of recommended models on rice – soybean/groundnut - rice enhanced yield components and grain yields of crops at three sites of different seasons excepting in Cantho site at Spring – Summer season 2007 in comparison to conventional farmers’ fertilizer level. Moreover, this cultural practice not only saved 60 - 70 kg N and 60 kg P2 O5 kg/ha and also obtained higher economic efficiency in term of gross income , low input and higher return above variable cost (RAVC) to an extent level of 57.66 %. The quality of products obtained higher in term of lipid, protein, phosphorus content in grain of crops but also the soil nutrients and benefit micro-organisms (fungi, bacteria and Actinomycetes). It can be recommended to larger scale areas reduce the cost production, environmental pollution, increase farmers’ live hood and sustainable agriculture.

Keywords

• phân rơm hữu cơ
• đậu phộng
• đậu nành
• hiệu quả kinh tế
• lúa
• vi khuẩn cố định đạm
• vi khuẩn hòa tan lân
• nấm trichoderma sp