Nitrogen level by observing the leaves


Several times there has been mention made that the best indicator of nitrogen 
levels in the pumpkin patch come from examining the tips of the newer pumpkin 
leaves. If the leaf tip is dark green then the grower should cut back on 
adding nitrogen to the garden and if light green then it is time to add 
nitrogen. I am wondering if anyone has used a color chart to do this? And if 
so what chart they used. What is the ideal "color" for the leaf tip? This 
gets even more difficult when you consider that some of the leaves may have a 
yellow tinge to them naturally. Comments????

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