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会泽县经济作物技术站于2000年向娜姑镇牛泥塘办事处承包了0.4hm2低产桑园和0.13hm2鱼塘。由于桑园产叶量低,当地6～8月气温较高,鱼塘易缺氧,造成养蚕效益和鱼的产量不高,给本站造成较大的经济损失。为了改进以上缺陷,提出“鱼塘边建盖鸭棚,鱼塘增养鸭”的方案。具体操作如下:1
The Huize Economic Crop Technology Station contracted 0.4 hm2 of low yield mulberry fields and 0.13 hm2 of fish ponds to Nunnong Niunitang Office in 2000. Due to the low leaf yield in mulberry fields and the higher temperature in June and August in the local area, the fish ponds are prone to hypoxia, resulting in sericulture benefits and low yield of fish, which cause great economic losses to this site. In order to improve the above defects, put forward a plan of “building a duck pond covered by fish ponds and raising ducks in fish ponds”. Specific operations are as follows: 1