For example, an individual can be AB, D positive, and at the same time M and N positive (MNS system), K positive (Kell system), Lea or Leb negative (Lewis system), and so on, being positive or negative for each blood group system antigen.
Nearly every list of easy-to-grow vegetables starts with lettuce, and with good reason: so long as you plant it at the right time, it will grow from seed with little attention. The right time is when the soil is cool, in the spring and fall. In Arkansas, you can plant lettuce seeds from February to April, and again in September for a fall harvest.
Test the soil Get a soil sample for testing. Preventing blossom end rot in tomatoes requires a soil pH of 6.5 to 6.8. Test the soil early in the year to allow time for results and to give any soil additions time to be effective. Adjust the soil's pH Based on the soil test, apply the recommended soil additions.