PROBLEM TO BE SOLVED: To provide a device and a method for efficiently applying carbon dioxide gas to a leaf part of a cultivated crop in the application of carbon dioxide gas to the crop cultivated in a greenhouse, etc.SOLUTION: In a method, a porous irrigation tube is used as a carbon dioxide gas application tube a device is installed at a position where carbon dioxide gas can be applied to a cultivated crop by covering the upper part of the carbon dioxide gas application tube with a cover so that the carbon dioxide gas can be applied only to a lower direction or a cross direction carbon dioxide gas application can be controlled by opening/closing an electromagnetic valve a period of application time can be reduced with a timer and extra application can be suppressed in a cloudy or rainy weather or from the evening to the night a carbon dioxide gas concentration of a leaf part of a cultivated crop can be controlled with a carbon dioxide gas concentration meter the carbon dioxide gas is intensively applied to the leaf part of the cultivated crop by performing all the controls separately or combining them and the extra carbon dioxide gas that is not used for photosynthesis is suppressed.COPYRIGHT: (C)2014,JPO&INPIT【課題】 本発明はハウス等の栽培作物への炭酸ガスの施用において、栽培作物の葉部分に効率的に炭酸ガスを施用する炭酸ガス施用装置とその施用方法を提供する。【解決手段】 炭酸ガス施用チューブとして多孔質潅水チューブを用い、下方向や横方向のみに炭酸ガスが施用できるよう炭酸ガス施用チューブの上部をカバーで覆い栽培作物に炭酸ガスを施用できる場所に設置し、電磁弁の開閉で炭酸ガス施用を制御できるようにし、タイマーで施用時間を、照度計で曇天や雨天や夕方から夜間の余分な施用を抑制するようにし、炭酸ガス濃度計で栽培作物の葉部分の炭酸ガス濃度を制御できるようにし、それぞれの制御を単独、または組み合わせることにより栽培作物の葉部分に集中的に炭酸ガスを施用し、光合成に使用されない余分な炭酸ガスの施用を抑制する。【選択図】図1
