氰氮化鈣之肥料學研究（第二報）

An Invesfigation on the Appliction of Calcium Cyanamide in Paddy Soil (No. 2.)

林國謙(K.C. Lin)

《中華農業研究》 1卷2期 (1950/06) Pp. 1-5

https://doi.org/10.29951/JARC.195006.0001

摘要

1.氰氮化鈣施用量對上瓖分量比率小時，雖在四月間（溫度爲20℃~25℃）初期之分鮮仍甚迅速。
2.在盆栽試驗中，氰氮化鈣與純粹結晶之Cyanamide對水稻之毒害完全相同，而缺乏粘土之砂耕區受害更烈，因在此情形下，Cyanamide之分解困難也。
3.在臺北氣候環境下，若水田土型與本所相類似，施用氰氮化鈣以在插秧前六日爲適宜。

並列摘要

From the first report we Knew that the main poison effect on the application of calciam cyanamide in paddy soil was due to the decomposifion of cyanamide. The results of this report might be outlined as follows:
1. Though the ratio between the amount of calcium cyanamide and soilwas small, the decomposition of cyanamide was still rapid at the beginring. This experimeut was carried out in the April, 1917. The variation of room temperature was between 20-25℃.
2. From the pot culture, the poison effects on the rice plaut due to the application of calcium cyanamide and pure cyanamide crystal were the same. Where, in sand culture pots, the decomposition of cyanamide was somewhat difficult, the rice plants were injured more seriously.
3. From the results of the field experimeut showed that under the Taipeh condition and similar soil type, the safty of using calcium cyanamide should be applied as ground fertilizer 6 days before the transplantatim of the rice plant.