關於石灰氮素施肥方法之研究　第二報　水稻在沖積細埴已耕土栽培結果

On the Good Application of the Calcium Cyanamide as Fertilizers at Formosa (2) Reports of Rice Experiments Useing the Fine Oultivated Alluvial Clay Obtained from the Farm of the National Taiwan Univer

徐水泉(S. C. Shyu)

《中華農業研究》 1卷1期 (1950/03) Pp. 7-12

https://doi.org/10.29951/JARC.195003.0002

摘要

本研究爲求石灰氮素的實用並求合理的施用法起見，故就作物生育及收量兩方面檢討之。以臺中65號水稻爲試驗作物用神積細埴已耕土爲試驗土埌，而在插秧前每隔二天爲一期，分期分區施用石灰氮素，施後灌水，使與土埌充份混和，並以磷肥及鉀肥與石灰氮素同時加用或無加用等諸法而檢討石灰氮素施用之適期。今將其主要結果摘錄如下：
(1)在此種土埌湛水狀態下，無論有否磷肥及鉀肥之存在石灰氮素的施用適期大約是在插秧前6天左右。
(2)石灰氮素區常比硫錏區之PH值稍高。
(3)石灰氮素在土中的分解在本試驗的條件之下，與磷肥及鉀肥之存否其影響甚少。因此在本試驗範圍內，石灰氮素的分解比較的多受土埌膠質化學性質的影響。

並列摘要

This investigation was made in the glass house by the pot culture method in 1943. The paddy rice of Taichung No. 65 was used as crop, and as soil five kilograms of the cultivated fine clay from the alluvial deposits were used. The calcium cyanamide was supplied before the planting of the rice at intervals of two days as Table 1, and the supply of the fertilizers was made with the supply of the calcium cyanamide or without it, that is, the day before the planting of the rice.
(The from abridges)
After supplies of the calcium cyanamide, soils were put on the water-logged conditions and mixed throughly. And the results obtained in this study may be briefly summarized as follows:
(1) From the yield and the growth of the rice, it was observed that the most suitable supply date of the calcium cyanamide lay about 6 days before the planting.
(2) The most suitable date of the calcium cyanamide took nearly no effect on the existence of the other fertilizers as calcium superphosphate and potassium sulphate.
(3) The PH value of soils with the calcium cyanamide is always higher than the PH value of soils using ammonium sulphate.
(4) On the decomposition of the calcium cyanamide to this soil, it looked that existence of P and K had nearly no effect on the decomposition of the calcium cyanamide. So under this experimental condition it seemed that the colloidal and chemical properties of the soil had relative effect on the decomposition of the calcium cyanamide.
(Laboratory of Soils and Fertilizers, College of Agr., National Taiwan University)