Livres associés

Tobacco soils of the United States: a preliminary report upon the soils of the principal tobacco districts.

Talks about the soil in its relation to plants and business. A book of observations and experiments for the use of schools, students, and farmers.

Synopsis of a course of lectures on the origin, composition, and functions of soils, and their bearing on agriculture. Delivered at the University of California, during the first term, 1874-5

Sulphur as a factor in soil fertility ...

• Soil fertility and permanent agriculture
  Auteur(s): Hopkins, Cyril G.
• Laboratory manual for soil fertility
  
• For Better crops
  

• What birds have done with me
  Auteur(s): Kutchin, Victor.
• What birds have done with me
  Auteur(s): Kutchin, Victor.
• The unity of the organism or, The organismal conception of life
  Auteur(s): Ritter, William Emerson