Tight subsoils and crop responses to irrigation

Also in this issue:

Hay harvesting by self-propelled swather compared with mowing and raking

Range fertilization of annual forage plants aids plant use of available soil moisture

California mastitis test for dairy herd improvement

Laboratory and field trials with sorptive dusts and dibrom for control of animal and household pests

Size and growth habits of trifoliate orange selections

Relationship between trees and cattle in ponderosa pine

Control tests for tomato insects

A modified nitric acid process for wood pulping

Copper chelates and copper enzymes

Application of plant analysis to cotton fertilization

Biochemical studies in fruit development

The California State Land Settlements at Durham and Delhi,