Improving nitrogen fixation

Also in this issue:

Hard tomatoes and hardy myths

Energy needs of pregnant heifers

Predicting meat quality

Smog hurts alfalfa

Ebbing timber supply

Iron deficiency in California crops

Devrinol and surflan: New selective weed control in young orchards and vineyards

Rose powdery mildew control in outdoor roses

Liquid protein supplement in dairy cattle rations

Maps of soil erosion potential — an aid in land-use planning in range and wildlands

Survival of the sugarbeet cyst nematode in the alimentary canal of cattle

Drip irrigation for plants grown in containers

Occurrence of in periwinkle in California

Ocypus olens: A predator of brown garden snail

Some physiological responses in two tomato varieties associated with levels of soil bulk density