氮肥施用量對五種熱帶葉菜類之生育與蛋白質含量之相關研究

Studies on the Response of Nitrogen Application to the Growth and Protein Content of Five Tropical Leafy Vegetables

由生長曲線、葉面積之變化、葉／（葉＋莖）之比率及蛋白質含量等資料可確定在酷熱、多雨之熱帶夏季環境下，青骨蕹菜、扁四芥菜、虎耳白莧菜、黃金白菜及黃金葉芥藍菜等五種熱帶性葉菜類之適當採收時間及其對不同氮素肥料施用量之效應。增施氮肥可以提高這些蔬菜之產量與蛋白質含量，在本試驗之情況下，每公頃施用200公斤氮素已足夠獲得這五種葉菜理想生長之所需。

Five tropical leafy vegetables which are generally considered to be relatively heat tolerant were included in an experiment involving different levels of nitrogen. These were water convolvulus (Ipomoea aquatica Forsk.), leaf mustard (Brassica juncea Cosson), edible amaranth (Amaranthus mangostanus L.). golden Pai-Tsai (Brassica chinensis Linn). And Chinese kale (Brassica alboglabra Bailey). Using growth curves, changes in leaf area, leaf/(leaf+stem) ration, and protein content, I was able to determine the appropriate harvest time for these five leafy vegetables when grown under tropical monsoon conditions. Nitrogen increased the growth and protein contents of the five vegetables. Nitrogen fertilization increased the production and protein contents of these crops under the experimental conditions. The rate of contents of these crops under the experimental conditions. The rate of nitrogen application in this experiment showed that 200 kg N/ha will be sufficient for the ideal production requirements of the five tropical leafy greens.