Updated plant nutrient range and made base algorithm to dictate nutrient uptake

Assets/Scenes/SampleScene.unity

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+  - {fileID: 8704148140120826694, guid: f89e947d8ef527b4a939de047e8e2817, type: 3}
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@@ -165,8 +165,8 @@ MonoBehaviour:
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   m_Name: 
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-  sizeX: 100
-  sizeY: 100
+  sizeX: 256
+  sizeY: 256
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@@ -567,7 +567,7 @@ GameObject:
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