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目的观察碳酸氢铵撒干粉加黑色地膜覆盖与碳酸氢铵集中点投放加黑色地膜覆盖的灭螺效果。方法碳酸氢铵撒干粉加黑色地膜覆盖与碳酸氢铵集中点投放加黑色地膜覆盖均分设100 g/m2、200 g/m2、300 g/m2、400 g/m2、500 g/m2剂量组和不覆盖、不加碳酸氢铵空白对照组。试验前进行螺情基线调查,试验后10、20、30、60、90和180 d观察钉螺死亡情况,方法同基线调查,计算活螺平均密度和死亡率。结果碳酸氢铵撒干粉加黑色地膜覆盖与碳酸氢铵集中点投放加黑色地膜覆盖2种方法各剂量组在试验后钉螺死亡率均大于试验前,活螺密度均比试验前有下降,而空白对照组试前试后钉螺死亡率、活螺密度无差异,碳酸氢铵撒干粉加黑色地膜覆盖300 g/m2以上各剂量组在10 d后钉螺死亡100%,活螺密度下降100%;而碳酸氢铵集中点投放加黑色地膜覆盖各剂量组到180 d时,钉螺均未全部死亡。结论碳酸氢铵撒干粉加黑色地膜覆盖消灭钉螺效果明显,以300 g/m2及以上剂量覆盖10 d为最佳,既能做到不除草省药、省时省工,又能达到满意的灭螺效果,宜大面积推广应用;碳酸氢铵集中点投放加黑色地膜覆盖效果较差,不宜大面积应用。
Objective To observe the effect of molybdenum ammonium bicarbonate sprinkling dry powder plus black plastic film mulching and ammonium bicarbonate concentration point on black mulching. Methods A total of 100 g / m2, 200 g / m2, 300 g / m2, 400 g / m2, and 500 g / m2 doses of ammonium bicarbonate dried powder plus black film and ammonium bicarbonate Not covered, without ammonium bicarbonate blank control group. Spirits baseline survey before the test, 10,20,30,60,90 and 180 d after the observation of death of snails, methods and baseline survey, calculate the average density of live snails and mortality. Results The results showed that the mortality of Oncomelania snails was higher than that before the test in both doses of ammonium bicarbonate sprinkling powder plus black mulching and ammonium bicarbonate concentration dropping plus black mulching. In the control group, there was no difference in mortality and live lobe density between the pre-trial and post-test snails. The death rate of snail was 100% and the live lobe density decreased by 100% after each dose of 300 g / m2 over 300 g / m2 with ammonium bicarbonate sprinkling powder and black film mulching. Ammonium bicarbonate concentration plus black film mulching coverage of each dose group to 180 d, snails are not all died. CONCLUSION: Ammonium bicarbonate sprinkling powder plus black film mulching has obvious effect on eliminating snails and covering the dips at 300 g / m2 for 10 days is the best, which not only saves the herbs and saves time and labor, but also achieves satisfactory extinction Spiro effect, should promote the application of large area; ammonium bicarbonate put in focus plus black film mulching less effective, not suitable for large area applications.