Norma relacionada
Practice Relating to Rule 76. Herbicides
Nigeria’s Manual on the Laws of War mentions the 1925 Geneva Gas Protocol and states:
There is no rule to prevent measures being taken to dry up springs and destroy water-wells from which the enemy may draw water or devastate crops by means of chemicals and bacterias which are not harmful to human beings. 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, §§ 12 and 6(9).