The first S model describes the period from the emergenceofseedlings to florescence and pollination, the main processes during which are the formation of roots, stems, leaves and floral organs.
第一个“S”过程是从出苗到开花授粉阶段,这一过程主要是根、茎、叶以及花器的建成。
2
Crusting of heavy clay soils after rainfall often causes poor emergenceof crop seedlings from soil or even failure of a crop.