Related Rule
France
Practice Relating to Rule 54. Attacks against Objects Indispensable to the Survival of the Civilian Population
France’s LOAC Summary Note (1992) provides: “It is prohibited … to attack, destroy, remove or render useless objects indispensable to the survival of the population (foodstuffs, livestock, crops, drinking water, etc.).” 
France, Fiche de Synthèse sur les Règles Applicables dans les Conflits Armés, Note No. 432/DEF/EMA/OL.2/NP, Général de Corps d’Armée Voinot (pour l’Amiral Lanxade, Chef d’Etat-major des Armées), 1992, § 4.2.
France’s LOAC Teaching Note (2000) states: “Objects indispensable to the survival of the population must absolutely be preserved (crops, livestock, foodstuffs, drinking water …).” 
France, Fiche didactique relative au droit des conflits armés, Directive of the Ministry of Defence, 4 January 2000, annexed to the Directive No. 147 of the Ministry of Defence of 4 January 2000, p. 6.
France’s LOAC Manual (2001) incorporates the content of Article 54(2) of the 1977 Additional Protocol I. 
France, Manuel de droit des conflits armés, Ministère de la Défense, Direction des Affaires Juridiques, Sous-Direction du droit international humanitaire et du droit européen, Bureau du droit des conflits armés, 2001, pp. 30 and 31.
Upon ratification of the 1977 Additional Protocol I, France stated that it
considers that paragraph 2, Article 54 does not prohibit attacks carried out for a specific purpose, with the exception of those which aim at depriving the civilian population of objects indispensable to its survival and of those targeting objects which, although used by the adverse party, are not used solely for the sustenance of members of the armed forces. 
France, Reservations and declarations made upon ratification of the 1977 Additional Protocol I, 11 April 2001, § 14.