Carrots

Tolerance of Carrots to Bicyclopyrone and Tolpyralate (2016)

Experiments in Corvallis, OR and Pasco, WA evaluated the potential of bicyclopyrone, tolpyralate, halosulfuron and EPTC for weed control in carrots. Bicyclopyrone and tolpyralate significantly reduced plant stand, injured carrots, and reduced yield at all three rates. Only bicyclopyrone at 0.875 oz/A and tolpyralate at 1 oz/A provided yield within range of linuron, prometryn, and EPTC treatments. The prometryn treatment yielded the most carrots, followed closely by linuron and EPTC. Halosulfuron killed all carrots. Weed control with bicyclopyrone and tolpyralate was similar when comparing within treatments with equal carrot injury. A possible exception was that tolpyralate may have controlled crabgrass better than bicyclopyrone. Prometryn control of hairy nightshade lasted longer than linuron.

Effects of nitrogen fertilizer rates and within-row spacing on carrot root yields and root characteristics

carrots

Objectives:

  • To evaluate the effects of 5 nitrogen rates and 2 within-row spacings on yield and root characteristics of Royal Chantenay carrots at North Willamette Experiment Station and Oregon State University Vegetable Research Farm.
  • To evaluate the effects of supplemental nitrogen rates, in addition to grower's base rates of N on yield at 5 grower locations (Red Cored Chantenay).
  • To determine N concentrations in carrot leaf sample from each of the experimental locations.

Effects of nitrogen fertilizer rates and tillage treatments (soil compaction) on carrot root yields and root characteristics

carrots

Objectives:

  • To evaluate effects of supplemental nitrogen rates, in addition to growers base rates, on yield and root characteristics.
  • To evaluate effects of four or five tillage treatments that result in various degrees of soil compaction on carrot root growth and yield of two varieties (O.S.U. Vegetable Research Farm).

Alternatives to Lorox in Carrot Production (1988)

carrots

Report to the Oregon Processed Vegetable Commission

Bill Braunworth
D. Curtis
Dan McGrath
Gavin Crabtree
OSU Dept. of Horticulture

Objectives:

  1. Obtain data on the weed control efficacy and crop safety of herbicides currently registered for usein carrots.
  2. Identify other herbicides not currently registered for use in carrots, which might serve as a substitute for Lorox.
  3. Obtain data which could be used toward the registration of suitable herbicides.