Studies on the Growth Characters and Nutrient Uptake Related to Source and Sink by Cool Water Temperature at Reproductive Growth Stage - Ⅱ. Influence of Cool Water Irrigation on the Inorganic Element Content of Leaf Blades, Rachis Branches and Chaff of Ri
냉수관계일수가 엽신, 지경, 영곡의 무기성분조성에 미치는 영향을 조사분석하였던바 다음과 같은 결과를 얻었다. 1. 엽신, 지경, 영각의 무기성분조성은 냉수관계일수가 길어질수록 전질소함량은 증가하나 인산, 가리, 규산함량조은 낮았으며 숙기별로는 전질소와 인산은 출수기 가리는 엽신과 지경에서는 출수기, 영각은 성숙기, 규산은 성숙기에 많았고 지경의 무기성분함량은 엽신보다는 영각과 유사한 양식을 나타냈다. 2. 냉수에 의해 도체가 저질소흡수과정장해를 받으면 인산, 가리, 규산도 흡수장해를 받으며 그 경향은 지경보다는 엽신과 영각의 영양장해가 현저하였으며 도체에 전질소함량이 높고 규산함량이 낮으면 지경과 영화의 퇴화 및 불임이 증가되고 지경의 영양장해가 엽신과 영각보다 퇴화 및 불임에 밀접하게 관여하였다.
This study was investigated about influence of different cold water irrigation on the nutrient uptake of leaf blade, rachis branches and chaff. Longer duration of cold water irrigation increased total nitrogen content in leaf blade, branches and chaff but decreased the content of phosphate, potassium and silicate. The highest content of total nitrogen and phosphate showed at heading stage, that of potassium in leafblades and branches at heading but in chaff at maturing stage, and that of silicate at maturing stage. Inorganic element content in branches was similar with that in chaff in general. The excessive uptake of nitrogen by cold water irrigation caused decrease in the uptake phosphate, potassium and silicate showing clear nutrient disorder in the blades and chaff. High total nitrogen and low silicate in rice plants seemed to lead to degeneration of branches and spikelets, and to spikelet sterility. Degeneration and sterility appeared to be closely related to nutrient status of branches.