行政院農業委員會台南區農業改良場  研究彙報第8號

水萍氮磷鉀三要素試驗

廖上池 洪國源

摘  要

南臺灣水萍繁殖極為普遍,在水田,排水溝,水池等地方是家畜禽魚類的好飼料。鑒於水萍富於蛋白質及炭水化物是一種極優良之青飼料,尤其是在夏天這些水萍產售成為有利的產業,其養料來源向僅靠市郊廢液溶解物,如用無機肥料做養料認為將可加速,其生育及改良品質。本試驗旨在明瞭在大規模經營時養料之氮磷鉀濃度應如何調配為其目標。

在59,60兩年試驗結果如下:適宜氮磷鉀濃度各為15,10,25PPM,可用尿素過磷酸鈣及氯化鉀等無機肥料,為養料有必要時予添加鎂及鐵等要素,PH保持於6.2,經此法養殖結果粗蛋白之含量最高可達25.88%。


Experiment on NPK Requirements of Lemna Paucicostata Hegelm

S. C. Liao

Summary

       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).



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