IT AGRI

• concerned with the exploitation of plant morphological (or structural) and plant physiological (or functional) responses with a soil & and atmospheric environmentto produce a high yield per unit area of land

  Crop production
• enumerate the 5 factors that affects the environmetal agriculture

  Environmental factor

  Edaphic factor

  Biotic factor

  Genetic factor

  Economic factor
• includes all water thatfalls from the atmosphere such as rainfall, snow, hail, fog, and dew

  Precipitation
• one ofthe most important factors influencing the vegetation of a place

  rainfall
• this influences the crop plants and vegetation

  Temperature
• the ratio between the amount of moisture presentin the air to the saturation capacity ofthe air at a particular temp.

  relative humidity
• suitable relative humidity for most crop plants

  40-60%
• Biomass production by photosynthetic processes requires light

  solar radiation
• this causes soil erosion, increases evaporation, and spreads pest and disease

  wind velocity
• CO2 is for photosynthesis, while O2 is vital for the respiration and photosynthesis
• significant plant nutrientfixed in the soil by lightning, rainfall, and N-fixing microbes in pulse crops.

  Nitrogen
• Certain gases like SO2, CO, CH4, released to atmosphere are toxic to plants
• Human activities alter or influence the natural processes favorable for plant growth and development.
• Helps in the chemical and biological activities of soil including mineralization

  SOIL MOISTURE
• Clay soil holds more water than sandy soil
• influences the rate of absorption of water and solutes

  SOIL TEMPERATURE
• these controls the microbial activity of the soil

  soil temperature
• Cold soils are not conducive to the rapid growth of most agricultural crops
• These are the sources of plant nutrients

  soil minerals
• what is the meaning oh pH

  potential hydrogen
• Fe and Al are soluble in low pH
• It supplies all the major, minor and micronutrients to crops

  It improves the texture ofthe soil

  It increases soil water retention

  soil organic matter
• Organic acids released during the decomposition of organic matter enable mineralization
• these are Essential in decomposition and nutrient cycling

  soil organism
• Microbes in the soil fix N to plant usable form for plants through symbiotic (Rhizobium) or nonsymbiotic (Azospirillum) association
• enumerate the 3 biotic factors

  plants

  animals

  physiography