‘Typical’ CEC in a field soil (a clay loam), in meq per 100 g?

Issues with its use as it is an ingredient in meth manufacturing:

A K source not well suited for application to tobacco:

A long used source of organic P (especially by vegetable and rose growers):

Best method for applying Mn to a crop?

Rock phosphate is a suitable source of P during that cropping year in which it was applied:

27. Diffraction (the bending of light around corners) limits the ______ of a telescope.

4. List two reasons that a bigger telescope is better than a smaller telescope.

23. In the class demonstration, when viewed through the diffraction gratings, the tubes of gas excited by a high voltage source emitted

Explain why a scientific theory can never be proven. If that is true, are scientific theories no better than guesses?