Question

Give three disadvantages of using conventional system of irrigation.

Answer 1

Hey...


Overhead Irrigation
From watering cans to sprinklers, overhead watering systems enjoy wide popularity. Overhead irrigation rains down to cleanse and hydrate gardens and lawns. Easily installed and moved, versatile sprinklers often include programmable features to minimize labor. Overhead systems benefit any terrain, no matter how uneven or rough, and easily adjust to suit different areas. Disadvantages include increased risk of plant disease due to wet foliage, although early morning watering reduces that risk. Also, winds often blow overhead sprays off target, wasting misdirected water and increasing evaporation. Runoff due to overwatering and nearby concrete add to water loss.

Surface Irrigation
Ancient farmers used surface irrigation, and many modern gardeners follow suit. Surface methods include flooding and furrow irrigation, as well as basins around trees and shrubs. Smooth, graded, gravity-driven slopes suit surface irrigation best. Advantages include low costs and minimal labor. A hose and a garden hoe are all it takes to have functioning furrows between vegetable rows. Water stays in the root zone, and foliage stays dry. Drawbacks to surface irrigation include potential overwatering and wasteful runoff. If soil lacks proper sloping or doesn't absorb readily, water can't move through the garden. Standing water damages plants and reduces yields for edible crops.

Answer 2

Excessive seepage and leakage of water create marshes and ponds all along the channels. The marshes and the ponds in some time become the colonies of the mosquito, which gives rise to a disease like malaria.

It lowers the temperature and makes the locality damp due to the presence of irrigation water.
Excessive seepage into the ground raises the water, hence causing water logging of the area.