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在 8块面积均为 660 m2 的稻田中 ,设计试验了 4种稻田养殖美国青蛙的田间工程类型 ,结果是纯利润以沟塘结合型最高 ,宽沟型次之 ,垄稻沟蛙型较低 ,平田型最低
In paddy fields with an area of 660 m2 each, four field types of American frogs cultivated in paddy fields were designed and tested. The results showed that the net profit was highest in the combination of gully and pond, followed by the wide-ditch type and lower in the frog type Flat type minimum