Experiment on NPK Requirements of Lemna Paucicostata Hegelm
S. C. Liao
In south Taiwan, Lemna paucicostata Hegelm (an aquatic plant) is harvested extensively from rice paddies, drainage channels and ponds as one of the most preferred feeds for livestock, fowls and fishes.< Its collection and sale constitute a profitable business. On account of the considerable high protein and carbohydrate contents, it is regarded as a superior green fodder plant especially in summer.
Dissolved matters from the urban are the only source of nutrients for this plant. It is suspected that inorganic fertilizers may be highly effective in hastening its growth and improving its quality. This experiment is to be conducted for clarifying the optimum concentrations of N, P and K in the aqueous medium for commercial cultivation of this plant.
We carried out this experiment from 1970 to 1971. It concluded:
1. Optimum concentrations of cultivation for this plant of N, P and K are 15:10:25 ppm.
2. Urea, ca-superphasphate and Kcl may be available for commercial cultivation, if necessarily Mg, Fe would be added and pH holds in 6.2.
3. Analysis on crude protein ranged from 7.69 (0:0:50 ppm) to 25.88% (30:20:50 ppm).