Effect of Nitrates on Plant Growth
Data Processing and Presentation:
Results:
Raw Data:
Relationship Between Distilled Water and the Growth of Duckweed
Relationship Between 10mg/ml Nitrate Concentration and the Growth of Duckweed
Relationship Between 25mg/ml Nitrate Concentration and the Growth of Duckweed
Relationship Between 50mg/ml Nitrate Concentration and the Growth of Duckweed
Relationship Between 100mg/ml Nitrate Concentration and the Growth of Duckweed
Relationship Between 150mg/ml Nitrate Concentration and the Growth of Duckweed
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Relationship Between 50mg/ml Nitrate Concentration and the Growth of Duckweed
Relationship Between 100mg/ml Nitrate Concentration and the Growth of Duckweed
Relationship Between 150mg/ml Nitrate Concentration and the Growth of Duckweed
Qualitative Data:
Distilled Water
Roots shows general trend of growth through out experiment. Many of the fronds also turned grey during the experiment. Some also turned yellow. However in particular in beaker 2 and 3 the fronds began to dissolve with in the beaker. Also some of the fronds had shrunk during the experiment and on the very last day an insect appeared in beaker 10.
10mg/ml Nitrate Concentration
There is a general steady increase in growth of duckweed. Also many fronds had turned grey during the experiment. And beaker 3 was broken during the experiment so no data was recorded after day 3.
25mg/ml Nitrate Concentration
There is also a general increasing trend of the growth of duckweed. Many of the fronds had turned grey during the experiment.
50mg/ml Nitrate Concentration
As the steady increase of duckweeds during the experiment there has been a recorded amount of fronds either turning transparent or translucent. Also green moss was found on all beakers except for beaker 7. Beaker 5 also had the most moss present. Roots length has also increased through out the experiment.
100mg/ml Nitrate Concentration
From day three in beaker 5 all the fronds had die. Also there is an increasing trend in the growth of fronds.
150mg/ml Nitrate Concentration
Many of the fronds turned grey during the experiment also there is significant growth on the roots of fronds. And in beaker 6 an insect was found inside the beaker along with the duckweed. Beaker 1 and 9 was broken during the experiment. There is also a steady increase in growth of fronds.
Averages On the Effect On Different Nitrate Concentration On Plant Growth
Calculations:
Calculating averages for different days in data recording
Where:
x = sum of the days results
n = amount of data recorded that day
y = average of that days recording
All of the grey fronds were not counted therefore only counting the fronds that was healthy and green.
This formula is used to calculate all the averages for all the data collected resulting in the graph above. A constant of two decimal places is used.
Graph:
This graph shows a general increasing trend in all solutions of potassium nitrate and distilled water. Distilled water has the least amount of plant growth compared to all the other different concentrations of nitrate solution. It also shows a general trend that as nitrate concentration increase the amount of plant growth also increase. However there is an anomaly, regarding the significant drop on day 8 of 50mg/ml nitrate concentration.
Conclusion & Evaluation:
Conclusion:
After observing the growth of duckweed in different nitrate concentration for 20 days. It can be seen from the graph that there is a clear correlation between the plant growth in an aquatic environment and different nitrate concentration. As seen on the graph it shows that as amount of nitrate concentration increased the amount of fronds also increased significantly. As can been justified by determining the difference between the distilled water sample and the rest of the samples containing potassium nitrate. Showing that potassium nitrate has a positive correlation on the plant growth, increasing the plant growth.
However there are a few anomalies in the data. As probably the most significant is the drop on day 8 of collection of data at 50mg/ml nitrate concentration. Which is most likely to be a miscount in fronds as the fronds are not likely to disappear. Even though the most significant growth is seen with the highest nitrate concentration solution, however it also shows that 25mg/ml nitrate concentration has a very similar to the 100mg/ml nitrate concentration. Showing that the concentration may not have an effect on the growth of the duckweed. However it definitely demonstrates that the nitrate solution has an effect on plant growth.
Also since the solution is rich in potassium it is commonly used as a fertilizer. As potassium is vital in plant growth, further supporting the data collected. Therefore it is reasonable to conclude that nitrate has an effect on plant growth as it increases the plant growth of duckweed in aquatic environment.
Evaluation:
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