令人心醉
发表于 2025-4-1 02:01:27
Theoretische Grundlagen der Arbeit, be increased greatly in the years ahead if the basic nutritional requirements of an explosive world population are to be satisfied (Fig. 1.1). Otherwise, the specter of hunger, malnutrition, and famine, already a reality with two-thirds of the world’s people, will continue to spread and grow, and t
Interstellar
发表于 2025-4-1 08:03:22
Theoretische Grundlagen der Arbeit,rer as the breeding methods used with the various crop species are studied in more detail. It may be illustrated here quite simply by comparing two common crop plants, wheat and corn, which differ in their pollination method. In wheat, a self-pollinating crop, pollen normally fertilizes the flower i
污点
发表于 2025-4-1 11:17:28
Jannike Diedrichsen,Gerhard Mentgespecies. For an example, let us look at a field of corn. Upon casual examination we may be impressed with the similarity of the plants within the field. There is a certain constancy of features among the corn plants: the development of the stalk; the size, shape, and arrangement of the leaves on the