One of the most important things you can/should do before planting your garden is to get a soil sample done. I have tried those test kits from the big box store and find them to be less than accurate. A good soil sample is important because if your PH is wrong then your plants will not be able to get the required nutrients from the soil, as a too high or too low PH will "lock" said nutrients into the soil. A soil test will also tell you what ratios of N, P and K to add to fix your soil and what amount of nutrients are in the soil. I use A&L Western Laboratories for all of my soil testing. They will do a comprehensive soil test for $33.00 that will be sufficient for most home gardener needs. This is my soil sample for this year.

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Here is a link that might be useful: Watch Me Grow A Giant Pumpkin