Plant Foods Must Be Soluble 
1. Nitrogen 12. Cobalt 23. Lead 
2. Phosphorus 13. Manganese 24. Aluminum 
3. Potassium 14. Iodine 25. Selenium 
4. Calcium 15. Zine 26. Copper 
5. Magnesium 16. Chlorine 27. Tin 
6. Sulphur 17. Arsenic 28. Barium 
7. Sodium 18. Silica 29. Strontium 
8. Iron 19. Oxygen 30. Molybdenum 
9. Boron 20. Hydrogen 31. Zirconium 
10. Carbon 21. Silver 32. Titanium 
11. Urea 22. Nickel 33. Vanadium 
Different kinds of plants require plant foods that 
are different. For example, the bean family; some 
varieties require much lime and other varieties grow 
well with little lime. Some varieties like water in 
large quantities, other varieties like a moderate 
amount. 
Earthworms will kill blueberries but seem to 
benefit most plants. 
Mushrooms can grow without any light, most 
plants cannot do so. 
I have heard of different kinds of strawberries 
growing from Mexico to within the Arctic Circle. 
The American Association of Nurserymen in- 
cludes over 1,400 nurserymen from the United States 
and Canada and perhaps a few associate members. 
I joined this association as a member several years 
ago. 
Our aim is to beautify America and make it fruit- 
ful. We also exchange ideas, seeds, plants, etc. 
Nebraska has about a dozen members. We will 
help you in various ways to make the Parks and 
Roadsides more beautiful as well as planting or- 
chards and landscaping your home whether in town 
or in the country. 
Our first job is to gather seed and see that it is 
correctly labeled and of good quality. Seed collectors 
help collect and distribute the seed but the growing 
is done exclusively by nurserymen who specialize in 
growing seedlings. Some of these we sell, others we 
transplant one or more times and sell them as trees. 
Sometimes we find marked variations in foliage or 
fruit. When we consider these variations of value, 
we propagate by root or twig cutting, other times 
by budding or grafting. Then these grafts are shaded 
and watered as needed and transplanted to grow 
larger until they are ready for sale. These trees are 
generally transplanted when one year old or root-cut 
every two years. That system forms a compact root 
system that can be transplanted much more readily 
than a seedling tree that has never been transplanted. 
