Glossary: J-K

See: Sorghum bicolor.
Jerusalem artichokes
See: Helianthus tuberosus.
Job’s tears
See: Coix lachryma-jobi.
See: Sorghum bicolor.
Juglans regia
Walnut. Cultivars are propagated vegetatively as clones and it is advisable to grow a mixture of clones to improve pollination.
See: Corchorus spp.
Jute, bimli
See: Hibiscus cannabis.
See: Brassica oleracea.
See: Sorghum bicolor.
See: Ceiba pentandra.
See: Hibiscus cannabis.
Koch’s postulates
Three postulates for demonstrating the pathogenic nature of a micro-organism, which must (1) be isolated from the diseased tissue and cultured, (2) be inoculated into a healthy host and shown to cause the same disease, and (3) be isolated from the inoculated host and shown to be the same organism. These postulates were very important in the late nineteenth century when the pathogenic nature of micro-organisms was still being disputed. But they are not necessary for amateur breeders.
See: Brassica oleracea.
See: Cola spp.
See: Eleusine coracana.
For any species, the carrying capacity of the environment is a constant, and it is represented by the letter ‘K’. K-strategists are species in which the population size is more or less constant, and is limited by the carrying capacity of the environment. K‑strategists tend to have large individuals that live for a long time, and which replace themselves by reproducing relatively infrequently with large and biologically expensive offspring (i.e., low birth rates and high survival rates). Elephants and Californian redwoods are K-strategist species. Note that there is a spectrum of continuous variation between the extreme K‑strategist and its converse, the extreme r‑strategist.
See: Ipomea batatas.