Growth_stage_of_rice_plant(水稻生长阶段_全英文版).doc

Table Of Contents Table Of Contents 1 Overview and Objectives 2 Three growth phases 2 Growth stages 0-9 3 Vegetative Phase 8 Stage 0 - Germination to emergence 8 Stage 1 - Seedling 9 Stage 2 - Tillering 11 Stage 3 - Stem elongation 14 Reproductive Phase 17 Stage 4 - Panicle initiation to booting 17 Stage 5 - Heading 20 Flowering 21 Ripening Phase 24 Stage 7 - Milk grain stage 24 Stage 8 - Dough grain stage 26 Stage 9 - Mature grain stage 27 Print version 29 Period/Growth phases 29 Overview and Objectives This reference guide discusses the growth stages of the rice plant. The information presented is based on the data and characteristics of IR64, a modern, high-yielding, semidwarf variety, but applies generally to other rice varieties. This reference guide will enable you to: recognize the 3 basic growth phases of the rice plant and the stages of development in each phase. identify the growth stages of a rice plant according to a 0-9 numerical scale. Each number in the scale corresponds to a specific growth stage. explain the specific physical changes in a growing rice plant. Three growth phases The growth of the rice plant is divided into three phases: vegetative (germination to panicle initiation); reproductive (panicle initiation to flowering); and ripening (flowering to mature grain) In the tropics, the reproductive phase is about 35 days and the ripening phase is about 30 days. The differences in growth duration are determined by changes in the length of the vegetative phase. For example, IR64 which matures in 110 days has a 45-day vegetative phase, whereas IR8 which matures in 130 days has a 65-day vegetative phase. Growth stages 0-9 These 3 growth phases consist of a series of 10 distinct stages. These stages are numbered and described as follows: Stage 0 is from germination to emergence: Stage 1 is called seedling: Stage 2, tillering: and Stage 3 is stem elongation: These first 4 stages make up the vegetative phase, the fir