What kind of environmental conditions does pepper require for growth and development?

1. Temperature: The suitable temperature for pepper seed germination is 20-30°C; germination cannot occur above 35°C or below 10°C. Its growth temperature range is 15-34°C, with the optimum temperature being 23-28°C during the day and 16-20°C at night, and a soil temperature of 20-28°C. Different growth stages of peppers have slightly different temperature requirements. During the germination stage, 25-28°C is best; during the seedling stage, it can be slightly lower, with 23-25°C during the day and 15-22°C at night; during the flowering and fruiting stage, 23-27°C during the day and 18-23°C at night is best. Sometimes on cloudy days, when the night temperature drops to 13-17°C, it is still favorable for fruit growth. Peppers grow extremely slowly below 15°C and cannot set fruit; growth stops below 10°C; below 5°C, plants suffer varying degrees of freeze damage, causing plant death. However, if above 35°C, growth is delayed and flowers and fruits drop; above 36°C, growth basically stops.

2. Light: Peppers have a relatively wide adaptability to light. Generally speaking, peppers require sufficient light, but they are more tolerant of weak light than other fruit vegetables. The light requirements of peppers also differ depending on the growth stage. During germination, seeds require dark conditions, and germination is often poor under light conditions. The seedling stage requires good light conditions, and the flowering and fruiting stage requires sufficient light, which helps promote the growth and development of floral organs. Insufficient light will cause flower and fruit drop. Peppers are not sensitive to day length. As long as the temperature is suitable and nutritional conditions are good, they can flower and bear fruit under either long or short light conditions.

3. Water: Peppers are neither drought-tolerant nor waterlogging-tolerant. Although the water requirement per plant is not high, because the root system is relatively small and its absorption capacity is weak, water must be supplied frequently for good growth, so moist and loose soil is required. If the soil is dry, plants will be short and fruits will be small and hard. If the soil is waterlogged, root development will be affected due to a lack of soil oxygen. Air humidity also affects pepper growth. Generally, a relative air humidity of 60%-80% is favorable for stem and leaf growth and for flowering and fruit setting. If air humidity is too high, it is unfavorable for pollination and fertilization and prone to various diseases.

4. Soil: Peppers are suitable for cultivation in neutral or slightly acidic soil. They require fertile loam with deep soil layers, good structure, rich organic matter, complete nitrogen, phosphorus, and potassium, and easy irrigation and drainage. When peppers are cultivated on saline-alkali land, root development is poor, leaves are not plump, and they are susceptible to viral diseases.

5. Mineral nutrition: Peppers have relatively high requirements for the three major elements nitrogen, phosphorus, and potassium, and the fertilization ratio throughout their life is 1:0.5:1. Only when sufficient nitrogen fertilizer is supplied do plants grow vigorously, but if nitrogen fertilizer is applied excessively and phosphorus and potassium fertilizers are lacking, plants will grow excessively and be susceptible to diseases. Applying sufficient phosphorus fertilizer can promote root development and flower bud differentiation and advance flowering and fruiting. Sufficient potassium fertilizer can promote the plant's absorption of nitrogen and phosphorus, accelerate the transport of nutrients, make stems thick and strong, enhance plant stress resistance, and also increase yield and improve product quality.