农学概论（Overview of agronomy）.doc

农学概论（Overview of agronomy） 1. Why is agriculture the foundation of the national economy? 4 Key points: (1) agriculture is an important source of peoples livelihood information... ; (2) agriculture is an important source of industrial raw materials... ; (3) agricultural products are important materials for the export of foreign exchange... 2. What types of crops can be classified according to the combination of use and botany system? 20 Main points: (1) food crops: grains, beans, roots and stems; (2) economic crops: oil, fiber, sugar, special crops; (3) forage crops; (4) green manure crops; (5) medicinal crops 3. What are the characteristics of vegetative growth and reproductive growth? 31 Main points: vegetative growth is the growth of vegetative body, mainly the growth of root, stem and leaf, which is the basis of reproductive growth. Reproductive growth is mainly the growth of reproductive organs, mainly flowers, fruits and seeds. What are the production factors of rice? 44 Key points: the number of effective panicles per unit area; The number of solid grains per ear (total number of grain and the rate of yield); grain 5. What are the evaluation indicators of crop quality? 56 Key points: morphological indicators and physical and chemical indicators... ; Quality of food and nutrition... ; Process quality and processing quality... 6. What are the characteristics of good varieties of crops? 135 Key points: fertility; Stable yield; High quality; Medium maturity; Broad eligibility 7. How about crop breeding and procedure? 162 Main points: according to the original, original, good type iii procedure. Seeds provided by breeding units with typical characteristics and optimal seeding quality are the original seeds, namely the seeds of the breeder; The seed produced directly from the original species or produced by the pure rejuvenation; The seed that is produced by the specialized production of the original kind is used for production. 8. Which aspects should be taken into