DESCRIPTION OF COURSES

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AP 611/SSAC 611 SOIL PHYSICAL ENVIRONMENT AND PLANT GROWTH                                                                                 (3L+1P) III

Objective
  To impart knowledge about characterization and management of soil physical environment in relation to plant growth and yield.

Theory

UNIT I
  Introduction: Effect of soil physical properties on plant growth - soil water, soil air, soil temperature, mechanical impedance and tillage practices.

UNIT II
  Soil water: Soil moisture – plant water relations, available water, newer concepts of water availability, least limiting water range, soil-plant-atmosphere system as a physical continuum, plant uptake of soil moisture, evaporation, transpiration and evapotranspiration, dynamics of water in the soil- plant-atmosphere continuum.

UNIT III
  Root growth – germination and seedling emergence, hydraulic properties of roots, characterization of root growth parameters, water balance of the root zone, soil physical properties and root growth, flow of water to roots.

UNIT IV
  Soil Temperature – effect of soil temperature on plant growth, soil temperature management, thermal regimes, mulching, radiation – heat budget and energy balance in the field, radiation use efficiency, radiation exchange in the field, exchange of heat and vapour to the atmosphere.

UNIT V
  Aeration – critical oxygen concentration and factors affecting.

UNIT VI
  Field water balance – field water balance, irrigation and water use efficiency, consumptive use, plant uptake of soil moisture

UNIT VII
  Nutrient- nutrient uptake and use by plants, managing soil physical condition for improved nutrient use efficiency, Integrated nutrient management in relation to soil physical condition.

UNIT VIII
  Resource conservation technologies- bed planting & zero-tillage - types, suitability and effect on soil physical properties, other resource conservation technologies and the impact (short and long term ) on soil health.

UNIT IX
  Modelling: Interactions of soil, management and climatic factors on plant growth, development of sustainability indices.

Practicals