1. take the grass (or other kinds of crops, such as peas, green, that must be the same for both groups of 2 experiments series)
2.It is grown in the Sun. Another group planted using zinc to cover does not receive sunlight (provided the control experiments and Chung are the same in all respects except to get the Sun to not receive the sunlight)
3.Control of the quantity of water in the Group 2 category is approximately equal to 2 weeks notice and record the results
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