L20 : Questions - Crop Production & Management, Science, Class 8 Video Lecture

hello friends this video on crop
production and management pack 20 is
brought to you by exam feel calm no more
fear from exam question number 6
what does irrigation describe two
methods of irrigation which conserve
water
so irrigation is artificial application
of water to soil to ensure growth of
agricultural crops so basically instead
of completely depending on drain so we
have introduced a method where we are
and it cannot completely dependent on it
even if there is no rain we can
artificially applied water to the soil
now the question is how do we apply
water to the so I there are many
different ways so here we will mention
two methods those two methods which have
to conserve water they are basically the
modern methods of irrigation which
happen introduced now to save water
because the traditional methods like
manually pouring water bringing the
quantity of water from the wells and
then scattering it 12 the fees that used
to involve a lot of water wastage so to
prevent that these modern methods have
come out so one of them is the print
sprinkler system so what happens here is
we have small we have these rotating
nozzles located at periodic intervals
and then water comes out of this like
this now these thousands are rotating so
the water gets spread over a particular
radius here it about begins to each
nozzle and that's how the entire will
get water so that is one system the
other system is the drip system where
water falls job-wise near the roots of
each locks here also you see from the
way there comes from a pipeline the
maintenance
to stop me biplane and from there these
perpendicular pipelines are located so
the water will be coming out in drops
and that is how this prevents any sort
of water wastage so these are the two
systems which are quite prevalent these
days and they also conserve water
question number seven
if wheat is shown in the karo season
what would happen discuss so wheat is
what kind of a crore it is a gabby crop
so it means less water but in kind of
season it is the rainy season so that is
their sort of rains a lot of water so
what will happen how do I need me to
needs moderate temperature and
irrigation for good growth so it doesn't
mean too much of water but in kind of
season rains would lead to water logging
which would adversely affect the beach
productivity so beach doesn't want their
water logging so if there is water
logging then the weed plants
productivity will reduce so if we do
sewn in the head of season then the
productivity will drastically reduce
question number needs explain how soil
is affected by continuous plantation of
crops in a field now what happens if you
continuously cultivate crops in a
particular field in the same you are
continuously planting crops so what may
happen if we tighten the crops will take
in the minerals and the nutrients from
the soil now there is no gap which is
getting which the soil is getting so the
soil is continuously being used up for
nutrients by the plants so either there
isn't over a period of time the soil
will have lack of nutrients because most
of the nutrients will get used up by the
plants so they are giving nutrients
depletion in the soil
lack of nutrients in the soil so that is
one thing the second thing is when there
will be no nutrients in the soil and the
soil fertility will also reduce so these
are the two major impacts that the soil
quality will decrease that
soil fertility will decrease and there
will be lack of nutrients in the soil so
these will be the two major impacts if
we continuously can tear it rocks in a
particular field question number nine
what are weeds and how can we control
them weeds are unwanted plants that
compete for nutrients peas water and
light and therefore the adversely affect
the crop root so they just grow on their
own but once they start growing they
also need the same basic things which
our desired crop needs for example in
this wheat field the weeds also need
nutrients Bayswater light and our d2 the
crops also need the same things so they
both have competition with each other
and as a result the weeds grow at the
cost of the nutrients which would have
gone to our wheat crops so how do we
control them by application of VD signs
which are chemicals that kill weeds
alone and they do not damage the crops
so that's how we can control them
question number 10 arranged evolving
boxes in proper order to make a flow
chart of sugarcane crop production so
but we don't see anything in the boxes
no we do have stops so these are there
in the boxes now we have to arrange them
in particular order that which is going
to happen at the first then what is what
happen so that means we have to arrange
it in a particular sequence so the first
thing that has to happen for sugarcane
crop production is first to buy we have
to contain the soil so this is going to
be the first step
so I preparation once the soil is
prepared then what do we do now in the
preparation of the soil what are the
activities that take place ploughing has
to take place with cloudy
so now once ploughing is done then what
will we do so we prepare the soil you
plow with it and then what do we do we
provide my mouse to the field so once
that is done then what do we do
we saw the sea
that is cattle disease so once once the
seeds are also scattered then what we do
then you have to provide water so we
have to alleviate the feed
so once irritation is also that then
comes the harvesting because now we are
props will gradually mature over a
period of night so you cut the crops
so once props are cut then they are then
the grains are separated from the straw
that is etching is done and after that
the crop is sent to the Sugar Factory
so this is how the entire process takes
place
now sometimes ploughing is formed by
sowing which in turn is followed by
manually but most of the times manual
instant before so that the soil first is
prepared completely by providing -
fertilizers etc so let us look at
question of any level give one mode for
the following providing water to the
cross so artificially how will be water
to do cross what is that process one yes
that is fine irrigation so the advantage
of this process is that we do not have
to depend completely on rain raining for
agriculture keeping crop drains for long
time under proper conditions so that is
what one has storage so that we can keep
it well protected from insects or micro
so that it can be used later
certain plants of the same kind room on
the not skin that is crop a machine used
for cutting the matured crop so the
value of much more proper squat
harvesting and this type of machine is
what I Western a rabbit rock that is
also one of the purposes some of the
examples of wrapping troughs are we eat
gram excetera
so we you can say gram is an example for
having crop which is also a pulse a
process of separating the draining from
shaft so the process of separating grain
from shaft is actually call threshing
this process is at
crashing so one such process could be
winnowing so be knowing is an example of
a threshing process where the grain gets
separated from the shack so these are
the one moves for each of the
description so with this we have reached
towards the end of this lesson I hope
that this very first lesson of science
on crop production and management would
have helped you so please go through it
over and again and then see you all in
the next lesson thank you please visit
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