Fertilizer placement for rice: Ammonium-form nitrogen drilled into seedbed before flooding increased rice yields 25% to 50% in placement experiments
AuthorsD. S. Mikkelsen
D. C. Finfrock
Authors AffiliationsD. S. Mikkelsen is Assistant Professor of Agronomy, University of California, Davis; D. C. Finfrock is Associate Specialist in Agronomy, Biggs Rice Experiment Station, University of California.
Hilgardia 11(7):7-15. DOI:10.3733/ca.v011n07p7. July 1957.
Ammonium-form fertilizers have special significance in the production of the California rice crop because ammonium nitrogen is the only inorganic form that can be maintained in continuously flooded soils. However, the maintenance of ammonium nitrogen is dependent upon proper fertilizer placement. When ammonium nitrogen is placed at a depth of 2?-4? in a rice seedbed prior to flooding, its maximum utilization for increased rice yields is realized. Nitrogen which is converted to nitrate nitrogen before or after flooding will be denitrified and lost from the soil as nitrogen gas.
Also in this issue:Casing frozen strawberries: Automatic carton-casing and case sealing equipment effects substantial savings in fruit and vegetable freezing plants
Tree fruit cuttings propagated: Vegetative propagation of softwood cuttings of certain tree fruit rootstocks achieved by chemical and mist treatments
Weeds in drained rice fields: Early application of herbicides by air and by ground rig controlled weeds in drained rice fields in tests in 1956
Milled rice yields: Tests show yield and quality affected by drying-air temperature and humidity
Artichoke plume moth control: Experiments and field practices during 1949–1957 show value of properly timed parathion treatments and good sanitation
Artichoke production: Costs and returns to growers studied in survey conducted at Half Moon Bay
Imported parasites established: Natural enemies of the spotted alfalfa aphid brought from the Middle East in 1955–56 now established in California
Navel orangeworm: Summer infestations of codling moth on walnuts favorable to navel orangeworm
Effect of oil spray on lemons: Juice quality and yield were not affected by pest control sprays in tests made in two southern California orchards
Effect of storage on leaching of minerals and nitrogen from asparagus and peas during cooking
Buffering action of nonacid vegetables