为了了解育珠池塘常年钙离子含量的变化,便于掌握施用石灰的时间和用量,我们对育珠池塘中的钙离子含量作了测定,並对育珠池塘中施用石灰效果作了观察。材料和方法选用5个不同大小的育珠池塘,面积分别为:1号池2.8亩,2号池16亩,3号池7.3亩,4号池3.3亩,5号池9亩,平均每亩养蚌约800只,每月测定池中钙离子含量 In order to understand the changes of perennial calcium ion concentration in Yubo Pond and to know the time and amount of lime application, we measured the Ca2 + content in the Yugu Pond, and observed the effect of applying lime in the Yugu Pond. Materials and Methods Five different sizes of fertile pearl ponds were selected. The areas were: No. 1 pond 2.8 mu, No. 2 pond 16 mu, No. 3 pond 7.3 mu, No. 4 pond 3.3 mu, No. 5 pond 9 mu, average mu Algae about 800, monthly determination of calcium ion content