Germination is the initial stage in the development of the plants after germination of its seed. In the development of seedlings of agricultural plants distinguished phases: the emergence of seedlings, when indicated by the output out from the soil of the individual tops of the plants, and the seedlings, when at least half the field is covered with emergent plants (at planting member when clearly indicated by the rows of seedlings).
The appearance of seedlings can be very different. In cereals shoots — subulate, in the form of a coiled or folded sheet, embracing the rudiments of the next leaves and a Bud, which develops a stalk. In other agricultural plants (dicots) seedlings usually are stalk, bearing at the top of the open semental (or, if the latter remain in the soil, the first leaves) seed plants (kidney) between them.
Semental some of the plants not come out (for example, peas), in others they come out, sometimes very quickly fall off (like beans), sometimes remain and form the first leaves. Sementelli (or first leaves) are usually very different in shape from true leaves, and their form varies greatly. In some plants they are thick, fleshy, other — leaf, wide (for example, radish), narrow, elongated (e.g., tomato).
Signs for plant identification, the seedlings are usually form Amendola (or first leaves), pubescent, the color of the shoots, the character of the root system and so on. Sometimes on shoots you can define even the plants belonging to one or another intra-specific group (for example, common forms of spring wheat differs from winter pubescence of the first sheet).