Introduction
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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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Introduction

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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.


Introduction

Drip Irrigation System

Furrow Irrigation System


Introduction

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.


Favorable water quality parameters

Favorable Water Quality Parameters


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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