一、草本,节膨大。 二、单叶对生。 三、花两性,整齐,二歧聚伞花序或单生,5基数;

一、多数为草本,具根状茎、鳞茎、球茎 二、茎直立或攀援状

一、多年生草本或亚灌木。 二、花大而美丽,单生枝顶或有时成束,红、黄、白、紫各色;

一、 Concept of propagation 由旧个体产生新个体的现象叫繁殖。繁殖可以分 (一) vegetative propagation营养繁殖:扦插、压条、嫁接和分株; (二) asexual reproduction无性生殖(孢子生殖);

Study Goals of This Chapter Main Objectives in Current Plant Breeding General Principles for Decision of Plant Breeding Objectives

Hybridization Crossing Sexual Crossing Asexual Crossing Distant Crossing-interspecific Crossing Intraspecific Crossing-inter-varietal Crossing In this chapter: Hybridization Breeding i.e. CROSS BREEDING

General Characteristics A. Micronutrients are required by all plants but in smaller amounts compared to the macronutrients Deficiencies of micronutrients can reduce growth just as much as deficiencies of macronutrients Remember the \Law of the minimum

The principles of application fertilizers Law of the Minimum: the crop's yield is restricted by the lack of one element, even Mg- al Zn S though there may be sufficient quantities of all the

Concept of plant nutrition Plant nutrition is a term that takes into account the interrelationships of mineral elements in the growth medium as well as their role in plant growth

Soil fertil Soil fertility is the characteristics of soil that enables it to Provide nutrients in adequate amounts in adequate time In appropriate balance for growth of particular plant(s)