CPSC 112 Lecture Notes - Lecture 2: Cash Crop, Poaceae, Dicotyledon
14 Sep 2018
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Purpose, growth habit, life cycle: taxonomic systematic classification (evolution/biology) Warm season (killed by frost), most agronomic crops except small grains. Annual, perennial, biennial: life-cycle, photosynthetic reaction, cotyledon number, agricultural use. Note: bolting : plant is jumping ahead in its reproductive cycle due to temperature change. Annuals: completes its full life cycle within one year, seed -> germination -> maturation -> produces seed, all roots, stems, and leaves of the plant die annually. Germinates in spring, matures in summer, makes seed before cold temps/killing frost in fall. Germinates in fall, survives winter, makes seed in late spring or summer. Biennials: require two years (or two growing seasons) to complete life cycle, 1st yr: Translocate food resources in fall, store energy below ground. Perennials: lives more than two years, may store energy below ground. Note: majority of plants on landscape: herbaceous perennials, alfalfa and clover, tender perennials, out of region treated as annual (e. g. tomato, woody perennials (trees, berries)
