I just got the results of a soil test from a lab -- my garden soil has a PH of 7.3. I am guessing this s because my husband and son tilled some lime into it last year in an effort to be helpful. From what I've read, tomatoes, peppers, cucumbers, squash, and beans like a lower (more acidic) PH. The problem is, my garden is covered with landscape fabric and a system of drip hoses that I worked hard to install last year. I planned to plant in the holes (attached picture) or cut in new ones if needed. Is there a liquid I can apply to lower the PH -- or something I can spread on the fabric then turn on the hoses to have it soak in? What PH should I aim for? The garden is roughly 50 feet by 40 feet.