1. Shrimp period
The seeding period is from seed to secondary growth. In the long term, the spring valley takes 25 ~ 30 days, the summer valley takes 12 ~ 15 days, and the valley can grow a new leaf in 1 ~ 5 days. When valley seedlings have 3 to 4 leaves, the soil is moist, the seedlings can develop the root system twice and diversity begins to grow. The nutrients of the grains will be depleted soon after the seeding. Young rice seedlings rely on weak roots to absorb moisture and mineral nutrients from the soil to meet their developmental and developmental needs, and on seedlings and leaves for photocooperative use to produce organic matter. The abundance of seed grains and the poor environmental conditions of seedlings are highly correlated with the growth and development of seedlings。
2. Allocation period
The growth of the grains is secondary, and the rhythm begins at the throttle. In the long run, it takes 20-25 days in spring valley and 10-15 days in summer valley. When the seedlings grow up to about 10 leaves, they begin to grow. In the long term, millet can grow roots at 3-4 levels and 15-25 stubs. Embedded varieties occur at the same time as roots. As a result, this period, which is also referred to as the piloting and extraction periods, is the most drought-resilient period of the entire fertile period. Under suitable cold and early dry conditions, the secondary roots of the valleys are more robust. During this period, the development of the root system is affected by excessive soil moisture and poor ventilation。
3. Pregnancy
From the top to the ears, it is the gestation of the grain. Spring valley takes 25-28 days, summer valley takes 18-20 days. This period was one of most frequent growth in millet, tubers and leaves, as well as one in which millet larvae developed。
At the end of the pregnancy period, all the leaves had grown, and stretching and corrosiveness had been completed for all but the neck. Accumulation of stem matter amounts to 50 to 70 per cent of the total volume of dry material in whole. Root growth is the second peak of the entire reproductive life of the valley. The millet plant can take root at 4-6 levels, 60-90 for each. In parallel to the strong growth of the trophic organs of the valley, the development of the larvae is accompanied by the development of the trophic organs of the valley. In general, the division of the young cone sequence begins three to seven days after the graft. After 20-25 days of divided development, the cone sparrow stretches, branches form and flower organs are divided, i. E., enters the process of smelting。
Mi's pregnancy is a period of multi-centre growth. In the long run, there is not only a contradiction between developments on the ground and those under the ground, but also a balance between nutrition and reproductive development。
Due to the growth of roots, troughs, leaves and branches from the top to the first level, the cleavage of cones does not prevail, and nutrients and moisture absorption is still slow and long. From the first branching of the ear to the spiking period, it is mainly the growth of the young ear and the rapid increase in demand for moisture and fertilizers. This has led to the development characterizing the start-up phase。
Sugar slurry
Episode and slurry periods are the shortest period of the entire reproductive period of millet. In the valleys, the secondary roots of the whole plant have grown, only the roots are still growing, all the leaves are growing, 18-20 pieces of early and 20-24 pieces of medium and late. As seedlings and blades gradually shrink at the root, it can be seen that only 12 ~ 16 leaves remain at this time. It takes between three and five days to grow a cone sequence from the top. At the same time, the neurological section of the neck developed rapidly at the same time. It takes 10 to 20 days for a pore to fully bloom. Short-haired small-pee varieties have shorter flowering periods than long-haired small-pee varieties. The whole german flower is arranged in the order of the top, centre, top and foundation of the ear. The lax pollination and fertilization process was completed on the day the valley blooms. The fertilized eggs begin to develop. Seeds are first conjunctivated by the skin and the skin, then the particles begin to stretch vertically and then move in the direction of width and thickness. Seed sizes are fixed 12-16 days after flowering and do not increase。
During the slurry period, the growth centre of the valley is the long and coarseness of the ears, which completes the process of flowering, fertilization and premature embryo development. This life requires the highest temperature, fearing rain and drought. During this period, the demand for moisture and fertilizers in the valleys should be fully met, with a smoothing of the spiking period and the acceleration of the flowering process。
5. Particle period
From the beginning of the slurry to the full maturity of the seed grain, it is the stage of seed formation. It takes 35 to 40 days in spring valley and 30 to 35 days in summer valley. It is the longest period of the entire reproductive life. Food weight and quality formation is the development centre for this period. At this point, 60-70 per cent of the nutrients converted by the absorption of photocolyts and roots produced by green organs are imported into food. Storage in saps and foliage may also be transported to seed grains. The accumulation of photocoding during this period has determined more than 70 per cent of food production。
Since the order of flowering in the valley begins at the top and centre and then expands to both ends, the flowering in a grain field is also gradual at the top and so so is the filling and weighting of seeds. It takes 40 ~ 45 days for the whole ear to mature and 10 ~ 12 days for the slurry to determine production. During this reproductive period, the resilience of the valleys has been significantly reduced and neither drought nor flooding. Therefore, the main direction of cultivation and management should be to maximize the life of root systems, protect more green lands, prevent droughts and floods, and obtain more seed grains and full seed grains, thereby achieving strong ears。
There is no complete separation between nutrient growth and reproductive development, from extraction to flowering. Thus, based on the development characteristics, cultivation and management needs of millet, the five stages of its life are usually divided into three main stages of development, from seed seed seeding to throttle, which is a purely nutritional development stage, also referred to as pre-growth; the period between extraction and poaching is the period between nutritional and reproductive development. The period of maturity, i. E. The middle generation, from the time of poaching to the time of seed maturing, is a period of pure reproductive development known as the long term later in life. During grain cultivation, the pre-growth period is known as the decision period for the quality of the tree; the mid-growth period for the number of sugars and flowers; and the post-growth period for the weight of the grain per ear。
