Carrot (Danvers)/research

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Planting Season[edit]

Type Purpose Spring Summer Source
General Gardner Mar-15 Jun-30 [1] (*)
Danvers Gardner Late April Late June [2]
Danvers Gardner April Mid July [3]
Danvers Gardner 3 wk before last frost n/a [4]
Danvers Gardner 2-4 wk before last frost 60 days before first frost [5]
n/a n/a n/a n/a n/a

(*): Customized for Manchester UK

Soil Requirements[edit]

Fertilizer[edit]

Gardeners[edit]

Type Amount N-P-K Per Area Comments Source
n/a n/a n/a n/a n/a n/a
n/a n/a n/a n/a n/a n/a

Avoid using fertilizer or too much manure when planting.

Fertilize with a balanced fertilizer 5-6 weeks after sowing.

Commercial[edit]

Type N P K Comments Units Source
General 50 50 200 Sidedress (30-50N) assuming 400 cwt/acre yield [6] (*)
General 50 100 100 Sidedress (20-60N) Total lbs/acre [7]
General 50 50 100 Sidedress (25-30N) Total lbs/acre [8] (*)
General 50 100 200 Sidedress (25N) Total lbs/acre [9]
n/a n/a n/a n/a n/a n/a n/a
n/a n/a n/a n/a n/a n/a n/a

(*): Indicates that the value was optimized for the NUF Garden's Soil Test.

Seeds[edit]

Type Seed Weight Germination Time Time to Maturity Source
Danvers 18,000/oz 6-17 days 75 days [10]
Danvers n/a 14-21 days 70 days [11]
Danvers 20,000/oz n/a 65 days [12]
Danvers n/a 10-25 days 60 days [13]
n/a n/a n/a n/a n/a

Planting[edit]

Type Purpose Depth Trench Spacing Seeding Spacing Thinning Seed Rate Source
Danvers Gardener n/a rows (~5.4 seeds/inch) 1" 1 oz per 280 linear ft [14]
Danvers Gardener 1/4" rows 4 seeds/inch 1.5-4" 2.4M/100 ft row or 1044M/acre [15]
Danvers Gardener 1/4" 8" n/a 2-4" n/a [16]
Danvers Gardener 1/4" 6" 1" 3" n/a [17]
General Gardener n/a 12" n/a 1.5-2" n/a [18]
General Commercial Fresh 1/8-3/8" 18" 18-24 seeds/ft 12-14 roots/ft 2-4 lbs/acre [19]
General Commercial Baby 1/8-3/8" 18" 24-35 seeds/ft 18-24 roots/ft 4-6 lbs/acre [20]
General Commercial Processing 1/8-3/8" 18" 12-18 seeds/ft 8-9 roots/ft 1-2 lbs/ft [21]
n/a n/a n/a n/a n/a n/a n/a n/a
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Some sources say to thin twice - once at 2" high (to 1" apart), and again 2 weeks later (to 3-4" apart)

Maintenance[edit]

The trick with carrot seeds is to sow them shallowly and then maintain moisture in that top layer of soil until they germinate. Because they may take as long as three weeks to germinate, this can be challenging, especially in hot weather when the surface of the soil is nearly always dry. The way to achieve this is to water very deeply prior to planting, and then either water very regularly or employ some other means to reduce evaporation. Some growers like to use lightweight row cover, which helps to maintain moisture and has the added benefit of keeping away the dreaded carrot rust fly. But we’ve also seen some growers simply lay a 2×4 beam, or even plywood, over the damp seedbed. This is lifted every few days to check on progress, and then removed at germination.

Water at least one inch per week.

Danvers carrots are quite heat tolerant and resist splitting.

Young carrot seedlings can withstand light frosts, but hard frosts heave the soil and break the taproots, which results in stubby and forked carrots. Young seedlings are burned off easily by high temperatures that occur before the plants are 1 inch high.

Although mature carrot leaves can tolerate several nights of frosts with temperatures in the mid-20°F range, they will be killed when temperatures fall below 20°F for several hours. Because leaves are needed for harvest, recoverable yields of roots decrease as leaves are killed by frost. Healthy tops resist frost better than blighted tops.

Irrigation must be used to get good carrot stands. Apply 1⁄2- to 3⁄4-inch of water every 4 to 7 days to prevent soil drying until carrots emerge. After emergence, irrigate weekly for the first 3 weeks. After the crop is established, irrigate occasionally to keep the crop growing rapidly.

Yield[edit]

Harvest at least ½ inch in diameter.

Can be harvested smaller (as baby carrots), but is 1.5 inches in diameter (6-7" in length) at maturity is ideal for processing.

For fresh market, 0.75-1.25 is ideal length.

Peak harvest period lasts about 3 weeks. Late summer sown carrots are sweetened after having been kissed by light frost, but please harvest before soil freezes, which would destroy the crop.

Type Purpose Time Point Total Area Source
General Gardener n/a 7-10 lbs 10 ft row (1.5-2" spacing) [22]
General Commercial Fresh n/a 8.8 (avg) 15 tons (high) per acre (2-3 lb seed) [23]
General Commercial Mini n/a 11 tons per acre (4-5 lb seed) [24]
General Commercial Processing n/a 35-40 tons per acre (1-2 lb seed) [25]
General Commercial Fresh n/a 8-12 tons (20 high) per acre (2-4 lbs seed) [26]
General Commercial Processing n/a 12-14 tons (30 high) per acre (1-2 lbs seed) [27]
General Commercial Baby n/a 4-6 tons (8-10 high) per acre (4-6 lbs seed) [28]
n/a n/a n/a n/a n/a n/a
n/a n/a n/a n/a n/a n/a

Storage[edit]

You may leave mature carrots in the soil for temporary storage if the ground will not freeze and pests aren’t a problem.

To save harvested carrots for winter use, prepare them by twisting off the tops and removing excess soil, but don’t wash them. Layer undamaged roots (so they’re not touching) with damp sand or peat in boxes topped with straw. Or store your fall carrot crop right in the garden by mulching the bed with several inches of dry leaves or straw.

References[edit]