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physiological characteristics

Peanut on slightly acidic soils have a certain ability to adapt is a pioneer in the development of red loam crops; but high soil acidity, such as calcium lime to be applied fertilizer in crop and short duration of bright sunshine, but not too sensitive to light cycles. Need a higher heat stability of the daily average temperature above 12 íŠ in order to sow; main reproductive period of the requirements of 20 ~ 28 íŠ temperature, the temperature fall to about 11 íŠ, the pod that is to stop development. Production areas in China to spend an average of reproductive age in 3500 íŠ accumulated temperature around. Growth period from 100 to 150 days, individual up to 180 days late-maturing varieties. General early varieties of seeds for a short period of dormancy, dormant varieties Late Maturity long dormant dragon of the strongest variety. Seed dormancy of peanuts in addition to suffering from the effects of seed coat and embryo of certain hormone-related substances. By ethephon, chemical substances, such as Kinetin,and are able to remove dormancy germination temperature.
Peanut rhizobia in the soil by root exudates to attract, through the epidermal cells into the cortical cells to split the multiplication of the cells stimulated the formation of the nodule. That period was a parasitic relationship between the nitrogen-fixing activity of Rhizobium and then strengthened, and it has become symbiotic. Peanut late childbearing, as a result of root fracture, ruptured nodule, rhizobia also return to the soil saprophytic life business. Rhizobium appropriate temperature for breeding 18 ~ 30 íŠ, the maximum soil water holding capacity of 60%, pH5.5 ~ 7.2. Excessive soil nitrate-N when there is inhibition of nitrogen-fixing rhizobia, there should be proper control of the growth of the early application of nitrogen. By phosphorus, potassium, calcium can promote and enhance the nitrogen-fixing Rhizobium reproduction capacity.

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