青萍、紫萍、槐叶萍生产力研究

On Productivity of Lemna Minor,Spirodela Polyrhiza and Saluinia Natans

在长势好、能构成天然群落的湖水区 ,进行增施人粪尿增产试验 ,青萍、紫萍、槐叶萍年鲜产量较天然水面分别增产 67% ,44% ,1 7 2 % ;增施磷酸二铵 ,则分别增产 44% ,42 % ,8 8% .选用霍格伦德 (Hoagland)和斯纳德(Snyder)液在试验桶内进行露天全生育期试验 ,全年共捞收 2 5次 ,取得青萍年鲜产量 2 90t/hm2 ,紫萍 1 96t/hm2 的高产 .并对青萍、紫萍、槐叶萍的饲用价值进行了研究 .

The paper describes the tests on the yields of Lemna minor,Spirodela polyrhiza and saluinia natans and the studies on their feeding uses.When we apply manure to the Lemna minor,Spirodela polyrhiza and Saluinia natans gathering naturally and growing well in the lake,their fresh yields could increase by 67%?48%and 17 2% respectively over the natural water,and when we appl (NH 4) 2PO 4,when they grow in Hoagland and Snyder cultivately liquid outdoors all the time ,we dredged 25 times a year and the fresh yields of Lemna minor and Spirodela polyrhiza are 290t/hm 2 and 196t/hm 2.ntheygrowinHoagl