Glover, J.2015-07-202015-07-201946East African Agricultural And Forestry Journal, p. 9-260012-8325http://localhost:8080/dspace/handle/0/5543Potatoes grown at 3,000 and 600 ft. a.s.l. at 5° S. in Tanganyika Territory from Kenya-grown commercial seed of Kerr's Pink can give yields of ware similar to English yields frovided that (a) the soils are manured on a scale comparable with that 0 moderate English practice, and (b) the plants receive enough water throughout life. Given these conditions the supposed depressing effect of short day-length, ranging between 11·75 and 12·35 hrs., and high temperatures, such as mean monthly maximum air-temperatures between 26£° and 281° C. (80°-83° F.), is of no practical importance. . It should be noted that Kerr's Pink is a main crop variety, which matures during the shortening days of the English autumn, and is perhaps day-neutral in its response to photoperiodism. The above-mentioned conclusions, therefore, hold good only for this variety, though they may apply to other varieties of similar type. Acknowledgementsenhttp://creativecommons.org/licenses/by/3.0/Journal ContributionEnvironmentGrowthPotatoesSolanumFood cropsYields