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PROBLEM: How can we effectively
kill weeds with the lowest concentration…
PROBLEM: How can we effectively
kill weeds with the lowest concentration of salt
without affecting the surrounding environment?
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Temperature
High temperatures
Effects the heat on photosynthesis and when temperatures rise, so do photosynthesis and respiration.
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Low temperatures
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As temperatures approach freezing, the plant growth stops and becomes dormant.
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Therefore, room temperature is the best option.
Soil
Salt raises soil salinity which dehydrate the roots of plants and keeps them from absorbing nutrients if too much salt is added or the concentration is too high.
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Water
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If the weeds are around plants with large or thin leaves than they need more water than succulent plants.
We must consider the weather and environment conditions such as rain fall because if the rainfall levels are high, we cannot use a lot of water. But if rainfall levels are low then we must use a substantial amount of water.
Cost
“Salt poising is costing the world $27.3 billion (USD) in lost crop production” (Stallard, 2014).
This issue is leading to major problems including decreased employment opportunities, increased health problems in humans and animals, infrastructure deterioration and the reduction of a farms property value if it contains degraded land.
Environmental Impact
On soil
Salt in the soil can cause “reduced infiltration, [the process in which water enters the soil], affects the rate which water flows through the soil and can cause the blockage of avenues for water and roots to move through the soil” (Pearson, Montana State University, 2003)
Over time, the salt can cause extensive damage to the soil, making it unusable for farming and other uses, as most plants are unable to survive in these conditions.
On plants
“The accumulation of dissolved salts in the soil water inhibits plant growth” (Munns, CSIRO).
Therefore, increased amounts of salt in the soil can affect the ability of plants to effectively germinate and grow.
Other Factors
Controllable Factors
The amount of water poured within each bed plant will be kept the same in order to allow the results to be reliable.
The experiment will be conducted inside at room temperature and applies to every garden bed being utilised.
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