RE: Organic and mineral fertilization in grasslands/ Chapter II
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Interesting question and experiment! Great initiative! Just one little comment, be careful using the average of percentages, most of the times it doesn't give you an exact number I will give an example:
Plant 1 - 9g of protein in a total of 100 g that means 9% of protein
Plant 2 - 24g of protein in a total of 400g that means 6% of protein , right?
if we take the average of protein percentage (9 + 6) / 200 = 7.5%
However if we do the same with the raw weight of protein / total weight of plants we have a different number, but more precise:
9g+24g = 33g/ (100g+400g) = 6.6%
you can only use the average percentage if the total weight of each plant is the same something like that:
Plant 1 - 9g of protein in a total of 100 g --> 9%
Plant 2 - 24g of protein in a total of 100g --> 24%
9+24 / 200 = 16.5% it is the same calculation in either ways!
Good job anyways =)
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Greetings dear @gwajnberg, thank you for your valuable comment that undoubtedly enhances the content, we agree, that if we get the crude weight of protein among the total weight of plants we will get different results.
Generally to determine the quality of the pastures, the sampling is carried out by launching a square of one square meter in 10 luegares within the area equivalent to 1 hectare to be representative, in previous investigations the percentage of protein was determined for each square meter sampled and the weight was also taken, to be more exact.
At present, due to the costs of the analyzes in our country, a sample composed of all the launched quadrats is taken and sent to the laboratory, we are sure that it is less accurate at the experimental level but they are less costs.
These are small tests, the percentage of leaves and stems that are sent also influences the size of the sample, taking into account that the stems are more lignified and have a lower value in terms of the protein present.
Grateful for your comment, have a great week.