Hollow stem in broccoli
AuthorF. W. Zink
Author AffiliationsF. W. Zink is Specialist in the Experiment Station, Department of Vegetable Crops, University of California, Davis and Salinas.
Hilgardia 22(1):8-9. DOI:10.3733/ca.v022n01p8. January 1968.
Growers of sprouting broccoli, Brassica oleracea var. italica, find that plants developing during the summer and fall months have a high percentage of hollow stem. These experiments were conducted in the central coastal broccoli districts of California to study hollow stem and pith discoloration in relation to growth and environmental factors. Foliar applications of the trace nutrients boron, magnesium, manganese, copper, zinc, and iron during the growth of the crop had no effect on the incidence of hollow stem and pith discoloration. Close plant spacing reduced the percentage of hollow stem. Higher rates of application of nitrogen fertilizer increased the incidence of hollow stem. The hollow stem condition begins following the initiation of the central inflorescence, the “center bud.” At first these are elliptical transverse gaps in the tissues which gradually enlarge so much that the stem is hollow as shown in the photo. There is ordinarily no discoloration of the surfaces of these openings at harvest. However, pith breakdown and discoloration may develop during shipping and marketing.
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
Fertilizer trials with safflower in sacramento valley
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