In the rice crop, the increased use of fertilizers and irrigation water favors the multiplication of disease organisms and insect pests along ... ability; on the other hand, elites are often deficient in resistance to one or more major pests and in tolerance to adverse conditions. ... the unimproved (minor and specialty) types; those of the past have largely been selected and purified by mass or pure- line selection.
|Title||:||Manual on Genetic Conservation of Rice Germ Plasm for Evaluation and Utilization|
|Publisher||:||Int. Rice Res. Inst. - 1976|