Ask about the xin giay phep san xuat phan bon
1. Ask about the temperature
xin giay phep san xuat phan bon
Temperature is the main factor affecting the growth and nutrition of the plant reproductive growth cloth. Lychees grow well in areas with average annual temperature of 21 - 250C. Later varieties at 00C and 40C, the early varieties stop growing in nutrients. When the temperature from 8 - 100C, the growth recovery, 10 - 120C slow growth, good growth and above 210C, 23 - 260C strongest growth.
Original fabric flowers can be mixed sprouts, flowers, leaves. High temperatures inhibit the formation of institutions that favor the growth of flowers nutrition, promote the development of the leaves. In contrast, low temperature differentiation promoting small flowers and floral organs, inhibit the growth of leaves original physical education, student penchant for real.
The process of differentiation fabric flower sprout closely related to temperature, the temperature is from 0 - 100C facilitate branched inflorescences and the flower. At 11 - 140C stems and leaves can develop into the inflorescences have economic value, at 18 - 190C or less still can form small bunches of flowers, many leaves but no economic value.
Temperature also affects the male female ratio of fabric flowers. Relationship between daily average temperature of the month 1-2 and percentage female flowers in inverse correlation, r = - 0.86 means that the lower the temperature, the higher the proportion of female flowers.
In addition, temperatures also affect flowering period and the development of the fruit. The average temperature higher effective development results in faster growth, in contrast, a low temperature, the slower the growth of the fruit. Temperature is one of the main climate factors are not controllable, it determines the area of cultivation and significantly affect crop yields.
The summer and autumn months are the time of strong growth lychees required large amounts of water. The winter months and rainy, winter buds fabric easy to play, are not conducive to the flower. in the flower stage, enough water, the total number of flower / flower cluster and the male / female flowers cluster decreased, but the number is not affected should flower the increased rate. More rain flowers are blooming in time lead to rotten flowers, fruit setting rate is very low can lead to crop failure.
Litchi trees are native to areas with an annual rainfall of 1250-1700 mm, air humidity is 75-85% should it withstand high humidity air in the shoot growth period. During the rainy months, the leaves are still green. Fabrics less tolerant than other trees like guava, jujube, longan but have better drought tolerance. Tháng 11-12, lychees need dry weather and cold to the flower
Plants need light fabric all year round, especially the period of formation, the flower, bloom and fruit development. Total hours lighting / year from 1,800 hours or more is quite suitable for lychees. Full light for photosynthesis help and assimilation of substances happen to be favorable increase nutrient accumulation, the growth and differentiation as well as sprouts flowers fruiting flowering well, much sunshine hours female flowers on the average amount increased beam respectively.
4. Land.
Lychees adapt on many soils. Soils as red soil, yellow soil, sandy, alluvial soil, soil ... can lychees growth and good results. Roots with mycorrhizal symbiosis cloth, slightly acidic soils preferred.
