Class 7 Exam > Class 7 Videos > Experiments to Study:Moisture in soil, Absorption of Water by Soil
Experiments to Study:Moisture in soil, Absorption of Water by Soil Video Lecture - Class 7
FAQs on Experiments to Study:Moisture in soil, Absorption of Water by Soil Video Lecture - Class 7
| 1. What is the importance of studying moisture in soil? |  |
Ans. Studying moisture in soil is important as it helps us understand the water content in soil, which is crucial for plant growth. It helps in determining irrigation requirements, optimizing water usage, and preventing waterlogging or drought conditions.
| 2. How can we measure the moisture content in soil? | |
Ans. The moisture content in soil can be measured using various methods such as the gravimetric method, where soil samples are weighed before and after drying to determine water loss, or using moisture sensors that provide instant readings based on electrical conductivity or capacitance.
| 3. What factors affect the absorption of water by soil? | |
Ans. Several factors influence the absorption of water by soil, including soil texture, organic matter content, compaction, temperature, and the presence of roots or vegetation. These factors affect the soil's ability to retain and release water, thereby impacting water absorption.
| 4. How does soil texture affect water absorption? | |
Ans. Soil texture, which refers to the relative proportions of sand, silt, and clay particles, plays a significant role in water absorption. Sandy soils have larger particles and drain water quickly, while clay soils have smaller particles and hold water for longer durations. Loam soils, which have a balanced mixture of particles, offer optimal water absorption and retention.
| 5. What are the consequences of improper moisture levels in soil? | |
Ans. Improper moisture levels in soil can have detrimental effects on plant growth and agricultural productivity. Insufficient moisture can lead to drought stress, wilting, and reduced yields, while excessive moisture can cause waterlogging, root rot, and hinder nutrient uptake. Maintaining the right moisture balance is essential for sustainable agriculture.
Text Transcript from Video
moisture and soil during a hot summer
day in a farmland have you ever noticed
that the air above the land is
shimmering this is due to the presence
of moisture in the soil due to the heat
the moisture from the soil evaporates
and the air above it seems to shimmer
because of the condensed water vapor let
us understand this clearly with the help
of an experiment for this experiment we
need a test tube two spoons of sand a
burner and a test tube stand fix the
test tube to the test tube stand and
place a burner below the test tube put
two spoons of sand in the test tube the
water in the soil evaporates on heating
the test tube and condenses on the
cooler parts of the tube this shows us
the presence of moisture in the sand we
can compare the soil sample with the
soil which has not been heated water
absorption by soil soil has the capacity
to absorb water but do all soils have
the same capacity to retain water let us
find out through the small experiment
for this experiment we need a funnel a
beaker filter paper soil samples and a
dropper take a funnel and place it on a
beaker
fold a filter paper and fill it with 50
grams of soil and place it in the funnel
measure a certain amount of water using
a measuring cylinder now pour this water
all over the soil using a dropper keep
pouring till the water begins to drip
from the funnel subtract the amount of
water from the measuring cylinder with
the amount you started with this gives
the water retained by the soil record
the results as follows date of the soil
50 grams initial volume of water in the
cylinder a ml final volume of water in
the cylinder BML volume of water
absorbed by the soil a minus b ml weight
of the water absorbed by the soil a
minus b grams percentage of water
absorbed a minus b by 50 in 200
repeat this experiment with different
soil samples and record all the results
we will notice that the water retention
capacity of all soils differ from each
other
find out which soil has the maximum
water retention capacity and which has
the minimum
day in a farmland have you ever noticed
that the air above the land is
shimmering this is due to the presence
of moisture in the soil due to the heat
the moisture from the soil evaporates
and the air above it seems to shimmer
because of the condensed water vapor let
us understand this clearly with the help
of an experiment for this experiment we
need a test tube two spoons of sand a
burner and a test tube stand fix the
test tube to the test tube stand and
place a burner below the test tube put
two spoons of sand in the test tube the
water in the soil evaporates on heating
the test tube and condenses on the
cooler parts of the tube this shows us
the presence of moisture in the sand we
can compare the soil sample with the
soil which has not been heated water
absorption by soil soil has the capacity
to absorb water but do all soils have
the same capacity to retain water let us
find out through the small experiment
for this experiment we need a funnel a
beaker filter paper soil samples and a
dropper take a funnel and place it on a
beaker
fold a filter paper and fill it with 50
grams of soil and place it in the funnel
measure a certain amount of water using
a measuring cylinder now pour this water
all over the soil using a dropper keep
pouring till the water begins to drip
from the funnel subtract the amount of
water from the measuring cylinder with
the amount you started with this gives
the water retained by the soil record
the results as follows date of the soil
50 grams initial volume of water in the
cylinder a ml final volume of water in
the cylinder BML volume of water
absorbed by the soil a minus b ml weight
of the water absorbed by the soil a
minus b grams percentage of water
absorbed a minus b by 50 in 200
repeat this experiment with different
soil samples and record all the results
we will notice that the water retention
capacity of all soils differ from each
other
find out which soil has the maximum
water retention capacity and which has
the minimum
About this Video
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Nov 08, 2024 Last updated |
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