Abstract:
Through the analysis and comparison of different rice-aquatic culture patterns,and the use of organic fertilizers,chemical fertilizers,pesticides,bio-pesticides and economic benefits were studied in the rice-aquatic animal(
Procambarus clarkii, Macrobrachium nipponense, Amyda Sinensis)culture modes.The experimental data showed that the rice-crayfish culture which used 400 kg/667 m
2 organic fertilizer,15 kg/667 m
2 urea,and 100 mL bio-pesticide of
Bacillus thuringiensis harvested 506.8 kg/667 m
2 rice and 106.7 kg/667 m
2 crayfish,while the benefit was 4 468.4 Yuan/667 m
2.The rice-shrimp culture which used 400 kg/667 m
2 organic fertilizer,15 kg/667 m
2 urea,15 kg/667 m
2 compound fertilizer,and 100 mL bio-pesticide of
Empedobacter brevis harvested 514.2 kg/667 m
2 rice and 56.4 kg/667 m
2 shrimp,while the benefit was 3 235.3 Yuan/667 m
2.The rice-turtle culture which used 400 kg/667 m
2 organic fertilizer,and 10 kg/667 m
2 microbial fertilizer,harvested 402.5 kg/667 m
2 rice and 52.8 kg/667 m
2 turtle,while the average annual benefit was 4 309.2 Yuan/667 m
2.Compared with rice culture,the rice-crayfish culture reduced the application rate of chemical fertilizer by 50 kg/667 m
2,which reduced the use of chemical fertilizer by 76.9%.The rice-shrimp culture decreased the application amount of chemical fertilizer by 35 kg/667 m
2,which reduced the use of chemical fertilizer by 53.8%.In the management of rice diseases,the rice culture try to select microbial bio-pesticides instead of traditional pesticides.However,it was effective for common diseases such as rice leaf roller,rice planthopper,sheath blight and rice false smut,and the continuous protection time was more than 25 days.The results showed that the rice-aquatic culture effectively increased the use of organic fertilizers and bio-pesticides and reduced the use of chemical fertilizers and pesticides.Simultaneously,the rice yield were relatively stable,the economic benefits were improved,and the pollution to the environment was reduced.In a word,it was an environmentally friendly and continuous production mode.