Subject: Why did the liquids kill the plants? Why did the tea do well?

For my science fair project, I watered 1 inch tall plants with orange, 
apple, and grape juice, milk and tea.  I used 1/4 c of liquid diluted with 
3/4 c. water.  I also watered with plain water and Miracle Gro.  The 
plants watered with juice died immediately and developed a white mold on 
the soil.  The ones watered with milk died in five weeks.  Tea did the 
best.  What in tea would make them grow well?  Could the antioxidants in 
tea get into vegetable plants as they grow and make them healthier?

Re: Why did the liquids kill the plants? Why did the tea do well?