Fertilizer trials with safflower in sacramento valley
AuthorsC. H. E. Werkhoven
K. H. Ingebretsen
T. E. Kearney
L. L. Buschmann
R. L. Sailsbery
M. D. Miller
B. A. Krantz
Authors AffiliationsC. H. E. Werkhoven is Lecturer and Assistant Agronomist, Department of Agronomy, University of California at Davis; K. H. Ingebretsen is Farm Advisor-at-Large, Davis; T. E. Kearney is Farm Advisor, Yolo County; L. L. Buschmann is Farm Advisor, Sutter County; R. L. Sailsbery is Farm Advisor, Glenn County; M. D. Miller is Extension Agronmist, Davis; B. A. Krantz is Extension Soils Specialist, Davis.
Hilgardia 22(1):6-7. DOI:10.3733/ca.v022n01p6. January 1968.
These tests, and other field observations, indicate that moisture is a key consideration in selecting a fertilizer program for safflower in the Valley. For dry-land soils or soils with low sub-surface moisture levels, 20 to 60 lbs per acre of N appear to be sufficient. Excess N may reduce yields.
Greater amounts of N may be utilized when safflower is grown under irrigation, or on soils with a high water table, or on deep soils filled with moisture. The effect of the previous crop is important here: when safflower follows rice or sorghum, up to 150 lbs per acre of N are generally adequate. However, when it follows a nitrogen-fixing crop such as alfalfa or vetch, smaller amounts may be sufficient. No reduction in safflower yield has been observed from excess N under highmoisture conditions.
Because safflower may not be irrigated, fertilizers should be placed in the moist root zone, at least 4 inches deep. If a nitrogen fertilizer is broadcast, at least 1 inch of rain or its equivalent in irrigation is needed to move it into the root zone.
Spring applications are preferable to fall applications. In a dry spring, aqua or anhydrous ammonia placed at a depth of from 4 to 8 inches can be expected to be more effective than broadcast dry materials. If dry materials are to be used, applications early in the spring are desirable to take advantage of spring rains.
Also in this issue:Influences of forests on snow in the ponderosa-sugar pine-fir zone of the central Sierra Nevada
Mobile gamma irradiator
Orchard heating with solid fuel heating bricks — under minimum favorable conditions
Hollow stem in broccoli
Decline of quince-rooted pear trees in Santa Clara County
Washing citrus leaves for leaf analysis
Vegetative propagation of quaking aspen
Soil desiccation and fumigation for armillaria root rot in citrus
Sugar beet yields increased by phosphorus fertilization