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Introduction. Water is an essential resource affecting growth, development and yield of crops. Potato is very sensitive to water availability as potatoes have shallow root system. pre-sowing irrigation is advantageous for uniform germination.

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Presentation Transcript
introduction
Introduction
  • Water is an essential resource affecting growth, development and yield of crops.
  • Potato is very sensitive to water availability as potatoes have shallow root system. pre-sowing irrigation is advantageous for uniform germination.
  • Total water requirement of crop at seedling stage varies between 350-550mm depending upon soil type, climate and crop duration. Lack or excess of soil moisture affects tuber yield and quality.
irrigation methods
Irrigation Methods

Water requirement of a TPS nursery can be fulfilled by various methods including,

  • Sprinkler irrigation,
  • Trickle/Drip Irrigation and
  • Furrow Irrigation
sprinkler irrigation
Sprinkler Irrigation:

Sprinkler irrigation system provides irrigation water like rain fall. Sprinkler irrigation system has characters such as,

  • It saves around 30-35% water than flood irrigation system.
  • It can be used to improve the microclimate of the nursery.
  • Irrigates a large area uniformly and at a time.
  • Minimizes soil erosion and prevents damage to soil structure.
  • The initial cost of establishment is high.
drip irrigation
Drip Irrigation:

Drip irrigation system is system of irrigation where water is supplied directly into the root zone of the plant.

Drip Irrigation system has following characters:

  • It saves around 50% water than flood irrigation system.
  • Fertilizers can be applied to seedlings along with water.
  • Minimizes soil erosion but may causes soil salinity.
  • Evaporation losses are minimum but initial cost is high.
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Drip Irrigation System

Furrow Irrigation System

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Furrow Irrigation System:

Furrow Irrigation System is a traditional system of applying water to the nursery. True potato seeds are sown on ridges and furrows prepared before sowing.

This system of irrigation has characters such as,

  • Wastage of precious irrigation water.
  • Water logging conditions may occur in heavy soils.
  • Not suitable for TPS nursery.
  • There are chances of soil erosion and soil salinity problems.
quality of irrigation water
Quality of Irrigation Water
  • Availability of good quality water is a very important input in nursery business. Potential sources of water include lakes, ponds, streams, wells and municipal water supplies.
  • Potato is very susceptible to salinity of soil or water. Sprinkler irrigation with salt containing water may cause water burn damage to foliage.
  • Most of the anions are phytotoxic and cations like Na+ damages soil structure.
selection of irrigation source
Selection of Irrigation Source

Potato is a sensitive crop therefore, following criteria may be considered while finalizing the irrigation water source:

  • Minimum Level ofcontaminants and debris in water.
  • Water Storage facility in most demanding period (June-August).
  • Duration of the water availability from irrigation sources.
  • Environmental and legal limitations for using the water source.
  • Quality and quantity of the irrigation water.
water quality parameters for different sources
Water Quality Parameters for Different Sources

Note: SS: suspended solids, DO: dissolved oxygen, EC: electrical conductivity, TN: Total Nitrogen, TP: Total Phosphorous, BOD: Biological Oxygen Demand, COD: Chemical Oxygen Demand

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