sufficient oxygen in the soil is regulated by maintaining the topsheet in its loose state. The carbon dioxide content in the soil increases as amended organic fertilizers.
need flowering plants warm in different periods of their growth and development varies. In the early stages of growth and development when hard root system develops, the most favorable moderate temperatures. In the period of active growth of the vegetative mass and the formation of generative organs require elevated temperatures, and higher in the afternoon than at night. To maintain optimal growth and development, a temperature in the range 15-25 ° C. At elevated temperatures 14 to 36 ° C accelerates the growth of plants, but at a reduced from 14 to 4,5 ° C. slows. Prolonged deficiency or excess heat Venet death of plants. Individual parts of plants react differently to the minimum and maximum temperatures. Buds are more sensitive to low temperatures in comparison with the vegetative plant part. Root system -compared to aboveground.Such
important life processes such as photosynthesis, respiration, and delivery of soil movement in the plant mineral nutrients, rest period, temperature dependent. With respect to heat plants divided into warm-and cold-resistant. Stability of the same plants to fluctuations and low temperatures depends on the growing conditions. For example, seedlings of annuals annuals grown in greenhouses or hotbeds and planted in open ground without any preparation, suffers greatly or dies at a temperature of about 1 ° C. A series of annuals planted in open ground, tolerates frost to minus 2-3 ° C. Hardening seedlings before planting in open ground to prevent it from damage and death.