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目的观察碳酸氢铵撒干粉覆盖黑色塑料地膜加不同用量,除和不除杂草的灭螺效果。方法选择1条有螺沟,分12段,试前进行钉螺基线调查。设碳酸氢铵覆盖除草5个组,剂量分别为100、200、300、400、500 g/m2;设碳酸氢铵覆盖不除草5个组,剂量同上;同时设不覆盖空白对照各1个组。试验后10、20、30、60、90、180 d按试前调查方法捕获土表钉螺观察,20 d时淘洗土内0～15 cm钉螺观察。结果不同剂量组氨浓度2 h达1 614～9 150mg/m3。空白对照除草和不除草10～180 d钉螺死亡率无增,活钉螺密度无下降;除草和不除草覆盖加碳酸氢铵100g/m2,10～180 d钉螺死亡92.55%～100%,螺密度下降90.61%～100%,土内钉螺死亡95.98%～96.74%;200 g/m2除草和不除草钉螺死亡95.92%～100%,密度下降93.27%～100%,土内钉螺死亡99.00%～99.6%;除草和不除草300、400、500 g/m2钉螺死亡和密度下降均100%,土内钉螺均死亡100%。结论黑色塑料地膜覆盖加碳酸氢铵一次性撒干粉100～500 g/m2对土表和土内钉螺均具有很好的杀灭效果,不除草与除草杀灭钉螺效果相近,加碳铵最佳用量300 g/m2,覆盖最佳时间10～20 d,省除草,省用水,省喷洒,省时省工,宜大面积推广应用。
Objective To observe the effect of molybdenum ammonium bicarbonate sprinkle dry powder on black plastic film with different dosages and eliminate and eliminate weeds. A method to choose a spiral groove, divided into 12 segments, snails before the baseline test. We set the ammonium bicarbonate cover weeding five groups, the dosage was 100,200,300,400,500 g / m2; ammonium bicarbonate is not covered with weeding five groups, the same dose; at the same time set not to cover a blank control group . After the test 10,20,30,60,90,180 d according to the pre-test investigation method to capture the snail on the soil surface observation, 20 d washes soil 0 ~ 15 cm snail observation. Results The ammonia concentration of different dosage groups reached 1 614 ~ 9 150 mg / m3 after 2 h. There was no increase in the mortality of snails and no decrease of live snails in the blank control from 10 to 180 days after weeding and weeding. The weed control and non-weeding covered with 100g / m2 ammonium bicarbonate and 92.55% -100% 90. 91% ~ 100%, 95.98% ~ 96.74% deaths of Oncomelania snails in soil, 95.92% ~ 100% deaths of 200 g / m2 herbicide and no - weed snails, densities of 93.27% ~ 100%, 99.00% ~ 99.6% Weeding and non-weeding 300,400,500 g / m2 Oncomelania death and density were 100% decline, soil snails were killed 100%. Conclusion Black plastic film mulching plus ammonium bicarbonate disposable sprinkling powder 100 ~ 500 g / m2 on the soil surface and soil snail have a very good killing effect, not weeding and weeding to kill snail effect is similar to the best addition of ammonium bicarbonate Amount of 300 g / m2, covering the best time 10 ~ 20 d, the province weeding, water, provincial spraying, saving time and labor, should promote the use of large area.