氮肥減量對甘藍產量之影響

Rational Nitrogen Fertilization Efforts on Cabbage Yield

賴文龍(Wen-Lung Lay)；曾宥綋(You-Hong Zeng)

肥培管理 ； 甘藍 ； 硝化抑制劑 ； rational fertilization ； cabbage ； nitrification inhibitor

臺中區農業改良場研究彙報

125期（2014 / 12 / 01）

1 - 10

繁體中文

本試驗於南投縣仁愛鄉進行甘藍肥培管理技術之研究，以建立山區低污染及維護作物產量、品質與減量肥培管理技術。試區處理以農民慣用量（800 kg N ha^(-1)，分4次施）、合理施肥量（400 kg N ha^(-1)，分4次施）、合理施肥量（400 kg N ha^(-1)，分6次施）、合理化施肥量（400kg N ha^(-1)）加60 kg ha^(-1)硝化抑制劑Dicyandiamide (DCD)，分6次施及合理化施肥之半量氮肥用量(200 kg N ha^(-1))加半量硝化抑制劑(DCD)，分6次施用。結果顯示甘藍作物在合理化施肥減量下，以200 kg N ha^(-1)之用量與30 kg ha^(-1) DCD硝化抑制劑配合使用時，較農民慣用肥料量（800 kg N ha^(-1)，分4次施）之處理增加甘藍產量17.4%，而合理化施肥量（400 kg N ha^(-1)，分6次施）與農民慣用量相比其甘藍產量並無差異。顯示高山區種植甘藍之氮肥用量減半再配合加DCD硝化抑制劑使用，可增加產量並減輕施肥造成之水質污染。

In order to maintain a low pollution and produce high quality and yield of crops in the alpine area, the rational fertilization practice should be established. An rational fertilization expeiment on cabbage was conducted in Renai township, Nantou County. Five treatments in different amounts of nitrogen (N) supply including: A treatmen as farmers' regular amount (4 times supply with 800 kg N ha^(-1)) , B treatment as rational fertilization (4 times with 400 kg N ha(-1)) , C treatment as the same as B treatment (six times with 400 kg N ha^(-1)). D tgreatment as C treatment but with addtional nitrification inhibitor, 60 kg ha^(-1) Dicyandiamide (DCD), E treatment as D treatment but half nitrogen fertilizer (200 kg N ha(-1)). The results showed the cabbage yield of applying 200 kg N ha^(-1) combined with DCD (treatment E) can be increased to 17.4% compared with farmers' usual fertilization (treatment A). The yield between farmers' usual fertilization (treatment A) applied in four times and rational fertilization applied in six times (treatment C) was similar. The results indicated that applying 200 kg N ha^(-1) with 30 kg ha^(-1) DCD obtained 17% increase of cabbage yield and the frequently applying nitrogen fertilizer with reduced amount of nitrogen fertilizer could produce the similar yield with no difference in farmer's regular one. Moreover, downstream water pollution trend caused by applying excessive fertilizer in the alpine area can be reduced.