2. Explain one modern method of irrigation.
Answers
Answer:
drip system , sprinkler system
Answer:
Explanation:Surface Irrigation Methods
The practice of surface irrigation is thousands of years
old, and as much as 95% of irrigation in the world is by
surface methods. Classifying surface irrigation methods by
the slope, the size and shape of the field, the end
conditions, and how water flows into and over the field,
they may be named as basin irrigation, border irrigation,
furrow irrigation, and uncontrolled flooding.
Basin irrigation is the most common form of irrigation,
particularly in regions with small layouts of fields. It is
generally favoured by moderate to slow intake soils, and
deeprooted and closely-spaced crops. There are a few crops
and soils not amenable to basin irrigation. Crops which are
sensitive to flooding and soils which form a hard crust can
be basin irrigated by adding furrowing or using raised bed
planting. Reclamation of salt affected soils is easily
accomplished with basin irrigation. Precision land levelling
is very important to achieving high irrigation efficiency in
basin irrigation.
In border irrigation, the field is divided into graded
strips by constructing parallel dikes or border ridges, the
ends of the strips being usually not closed. Water is turned
in at the upper end and flows as a sheet down the strip.
Border irrigation can be used on most soils, but is best
suited to soils with moderately low to moderately high
intake rate. It is suitable for nearly all crops except those
that require prolonged ponding. The precision of field
topography in border irrigation is critical.