| Since the 1970s and 1980s,the rice-duck farming model has basically taken shape and has begun to take shape.In the 21st century,driven by the concept of ecological agriculture and organic agriculture,this planting pattern has been raging across the country and has once become a model for farmers to become rich and run a well-off.However,in the specific implementation process,some big planters believe that the planting mode has high input costs,pests and diseases occur as usual,chemical pesticides still need to be applied,brand creation is difficult,economic benefits are not originally conceived,and so on.mode.In response to the rise of green agriculture,this paper designs four different kinds of without ducks and medicine(ck,A treatment),have duck without medicine(B treatment),without duck have medicine(C treatment)and have duck and medicine(D treatment).In the Tongzhou District of Suzhong,Jiangsu Province for two consecutive years from 2017 to 2018,the population dynamics of the main pests and spiders in the four treatment areas were systematically investigated.The predation content of ducks and spiders was traced by DNA molecular tracking technology.Qualitative analysis,by comparing the input value and output value,objectively analyzes the relative economic benefits of these four treatments,and provides a theoretical basis for the promotion of the rice-duck farming model and the issues that need attention in the promotion.Below are key research findings:The field survey for two consecutive years found that there are a large number of rice planthoppers and rice leaf roller in the four processing plots,and the population density is similar to that in recent years.The predatory natural enemy spider population also has four treatment plots.A certain scale.However,the design is handled differently,and the amount of pests and spider natural enemies is different.As an example,in 2017 the incidence of rice planthopper and rice leaf roller was the highest in the no-dump-free treatment area.On July 25th,the second field survey reached 37.43 heads/cluster and 23.13 heads/cluster respectively.The occurrence of rice planthopper and rice leaf roller was the lowest in the drug treatment community.On the same day,there were 24.52 heads and 13.05 heads/cluster,and the incidence of two pests in the duck-free treatment area was slightly lower than that of no duck.On the 25th of July,2018,the occurrence of rice planthopper and rice leaf roller in the no-drug-free treatment area reached 32.67 heads/cluster and 31.33 heads/cluster respectively,while there were two pests in the duck-medicated community.The population is only 18.33 heads/cluster and 8.77 heads/cluster.Two years of research have shown that the combination of moderate application of chemical pesticides and rice-duck farming can effectively reduce the occurrence of major pests in rice fields,but the effect of rice-duck farming model on the prevention and control of lepidopteran pests is not obvious;rice field predation The population of natural enemy spiders was basically the same in 2017 and 2018,and there was no significant difference in the amount of pre-and post-production of rice.The population of untreated plants in the middle of rice growth period was significantly higher than that of the treatment-treated plot,but the ducking plot The number is lower than the unfed duck community.The relative economic benefits of rice fields in four different treatment communities were analyzed by input-output analysis.Excluding the same agricultural resources,rent,labor and other expenditures,the output value mainly includes the rice output value and the duck output value.The input value mainly includes the pesticide fee and the duck raising fee,and the rice purchase price and the rice ex-factory price are different.The price was calculated and found that there was no other input in the duck-free treatment area,but the output value was the lowest.Taking 2017 as an example,the final duck-free drug-free treatment area(treatment A)relative economic benefit is only 1518.30 yuan and 1603.32 yuan per 667m2 at the purchase price and ex-factory price;there is a duck-free treatment area(treatment B)There are duck seedling conservation inputs and duck meat production,but the rice yield is not as good as the drug treatment area.The final relative economic benefit is 1397.52 yuan and 1213.17 yuan per 667m2 respectively,based on the purchase price and ex-factory price;The drug treatment area(treatment C)only has the input of pesticides,and its output value is higher.The final relative economic benefit is 1677.80 yuan and 1616.66 yuan per 667m2 respectively according to the purchase price and ex-factory price;District(treatment D)has the dual input of pesticide and duck seedling conservation.Although the rice yield is high,there is also the output value of duck meat.The relative economic benefit is 1461.82 yuan per 667m2 based on the purchase price and ex-factory price 1128.07 yuan.This study pointed out that if the duck-free treatment area is relatively low in economic efficiency,the economic benefits are very considerable if brands such as ecological rice or green rice can be created.With the help of DNA molecular tracking technology,the contents of spiders and duck intestines recovered from rice fields were detected and analyzed.It was found that the success rate of field spiders preying on rice planthoppers was not only closely related to the occurrence of pests in the treatment community,but also moved back and forth with ducks.related.In 2017 and 2018,there was a large amount of pests in the no-drug-free treatment area,and the positive detection rate of spiders on the rice-flying larvae reached 73.93%and 78.74%in the second field investigation,respectively.The disturbance of ducks reduced the feeding of spiders.The positive detection rate of spiders preying on rice planthoppers was only 69.74%and 65.98%.Especially in 2018,the positive treatment of spiders was observed in the b treatment community due to the ducks moving back and forth.The outflow rate was 12.76%lower than that of the a-zone treatment in the same period;the other two treatment plots significantly reduced the predation of spiders against rice planthoppers due to the application of chemical pesticides,and the spider-to-rice flight was observed in the second field investigation of the duck-free drug treatment area.The positive detection rate of cockroach feeding was 46.11%and 37.77%in 2017 and 2018,respectively.The positive detection rate of spiders in the drug-treated area of ducks was 42.22%and 29.32%,respectively.Treating the plot also reduced the detection rate of spider predators.However,the success rate of rice field spiders preying on rice leaf roller is not related to the presence of ducks.The study pointed out that the rice-duck ducks can not only prey on pests such as rice planthoppers and rice leaf roller,but also prey on important natural enemies such as spiders,and the results of two different treatment plots(treatment B,treatment D)tend to Consistent,but there is no drug in duck(treatment B).The positive detection rate of ducks on spiders is higher than that in ducks with drug treatment(treatment D).There are significant differences in the results of five investigations between the two treatments.Moreover,the positive detection rate of ducks to Tetragnathidae is higher than that of the genus Tarantidae.For example,in the first survey in 2017,the feeding rate of ducks to the genus Tarantidae and Tetragnathidae was 25.56.%and 30.00%.During the first investigationinin 2018 the feeding rate of D-treatment area of Tarantidae and Tetragnathidae was 23.33%and 27.78%,respectively. |
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