When will the latest batch of corn be planted in Wenzhou?

The latest batch of winter maize seeds in Wenzhou (65438+1October 20th-65438+1October 10) have been sown.

Corn growing environment

Corn temperature

Corn is a thermophilic crop, which needs higher temperature during the whole growing period. The biologically effective temperature of maize is 65438 00℃. Seeds germinate at 6- 10℃, germinate slowly below 10℃, germinate vigorously at 16-2 1℃, and the optimum germination temperature is 28-35℃, and stop germination above 40℃. The seedling stage can withstand short-term temperature dependence of -2-3℃. It needs 15-27℃ at jointing stage, 25-26℃ at flowering stage and 20-24℃ at filling stage. Different corn varieties have different requirements for temperature, and the early-maturing varieties in China require a cumulative temperature of 2000-2200℃; Medium-mature varieties are 2300-2600℃; Late-maturing products and 25OO-28OO (3000)℃. Most corn producing areas in the world are concentrated in July 2 1-27℃, and the frost-free period is 120- 180 days.

? Corn illumination

Maize is a short-day plant, which can blossom and bear fruit in short-day (8- 10 hour). Spectral components have great influence on the development of maize. According to research, corn with short-wave light such as blue light develops rapidly in the daytime, while corn with wave light such as red light develops rapidly in the morning or at night. Maize is a C4 plant with strong photosynthetic capacity and high light saturation point. Generally, the photosynthetic intensity of maize is 35-80mg CO2/dm2 leaf hour.

Corn moisture

Corn plants are tall and have large leaf area, so it needs more water. The optimum precipitation during maize growth is 4 10-640 mm, and drought affects maize yield and quality. It is generally considered that the area below 150mm in summer is not suitable for planting corn, but too much precipitation will affect the light, increase the harm of diseases, lodging and weeds, and also affect the improvement of corn yield and quality. Although corn needs a lot of water, its relative water demand is not too high, and its transpiration coefficient is 240-370, which is lower than that of barley (280-400), oat (340-500), purple flower (83 1) and clover (797), so the water consumption is more economical. The root system of maize is developed, which can make full use of the moisture in the soil. When the temperature is high and the air is dry, the leaves curl upward, reducing the transpiration area and achieving a proper balance between water absorption and transpiration.

Corn soil

Corn is not very strict with the soil. Corn can be planted on chernozem, chestnut soil and sandy loam with loose soil, deep soil layer and rich organic matter, and the PH value is in the range of 6-8. Maize can grow in soil containing 0.2 1% NaCl at seedling stage, which is greater than plant death. Corn plants contain 16 elements, except for C and H2O2 from CO2. Both should be absorbed from the soil.