1, the temperature
Rapeseed is a cool and cold-resistant crop. The minimum temperature for seed germination is 3-5°C. It can emerge in 3 days at 20-25°C, the flowering period is 14-18°C, and the fruit development period is 12- 15 °C, and a large temperature difference between day and night, is conducive to flowering and fruit development, increase the accumulation of dry matter and oil.
2, moisture
The long growing period of rape, large vegetative body, the results of the number of organs, and therefore more water, the water requirements for each growth stage: the general soil moisture at the seedling stage should be maintained at about 65% of field capacity; Lei moss to flowering The period is 75-85% of the water holding capacity in the field, and the period of silt development is 70-80% of the field water holding capacity.
3, fertilizer
Rapeseed is a fat-tolerant crop and has strong fertilizer absorption capacity. During the entire growth process, it is necessary to continuously absorb large amounts of nutrients such as nitrogen, phosphorus, and potassium from the soil. According to the measurement, for every 100 kilograms of rapeseed produced, the ratio of nitrogen, phosphorus and potassium is 1 to 0.35 to 0.95, and the demand for three elements is equivalent to more than 3 times of cereal crops. Secondly, boron fertilizer is an indispensable trace element in the growth and development of rapeseed. After boron deficiency, flowers appear to be impractical. After rape is smallpox, the young horn is not enlarged or strong. General production cuts of 20% to 30%, serious particles are not received.
4, soil
Rape is a straight-rooted crop, with a well-developed root system. The main root is deep into the soil, and there are many branches and fine roots. It requires deep soil, good structure, and rich organic matter. It preserves both fertilizer and water, and also loosens ventilated loam or sandy loam in weak acid or neutral soil. Among them, it is more conducive to increasing production and raising the oil content of rapeseed.
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