| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure which can prevent temperature rise therein in summer in which sun altitudes are high, does not cause shortage in light quantity in other seasons in which sun altitudes are low, and does thereby not need the repeated attachment and detachment of a covering material in any season, to provide a film giving the structure, and to provide a culture method by which the harvest yield of field crops can be increased. SOLUTION: This structure has a ceiling portion and sidewall portions placed on both the sides. The sidewall portions may be brought into contact with the ground or not. At least one specific naphthalocyanine compound is contained in an apex- containing portion or all portions of a ceiling portion, and the heat ray transmittance of the apex-containing portion or all portions of the ceiling portion is smaller than those of the sidewall portions and the ceiling portion except the apex-containing portion or those of the sidewall portions. The film for producing the structure contains the naphthalocyanine compound in the longitudinally central portion and contains or does not contain the naphthalocyanine compound in both the side portions, and the heat ray transmittance of the central portion is smaller than those of both the side portions. The structure is used in the method for culturing the field crops. |
