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Maturity

Maturity of a variety is often described as early, mid-season and late. Differences will occur between regions but the general rule of thumb that I follow is early - 60 days, mid season - 90 days, and late - 120 days measured from the time of planting until harvest. Potatoes will emerge anywhere from 3-5 weeks after planting. It is important to have frost-free days from the time of emergence until harvest.


Green Sprouting

Whole seed can be Green Sprouted (Chitted) prior to planting, this will ensure earlier emergence. 2-3 weeks prior to your desired planting date place your potatoes in a well lit area of the house, but not in direct sunlight. 16 Degrees Celsius is ideal.

Instead of producing long sprouts like those you will find during the spring in your cellar, the potatoes will produce strong short green sprouts which will be ready to grow into plants as soon as you get them in warm soil.


Green Sprouting How warm should the soil at planting time be? The soil temperature should be at least 5°C. Ideally the soil temp at the depth that the seed piece will be placed should be 10°C. It is also very important that the temperature of the seed piece is close to being the same as the temperature of the soil at planting time.
Green Sprouting

What is the best seed spacing when planting? The machinery on our farm is set up to plant the potato rows 3ft apart (1m). It seems far when you are planting, however by mid July the canopy of the plants will touch between the rows creating a solid mat of potato leaves.

How much space between potatoes within a row depends on the variety. Early varieties can be planted close together (4"-8"), as they tend to have a low number of tubers per hill. Planting them close restricts the nutrition and light each plant can access, which helps to keep the size of those nice new potatoes to a minimum. Mid season varieties are generally planted 8" to 12" apart. Late Season Varieties & Fingerling Varieties should be planted 12" or more.


Scab

The following varieties are considered susceptible:
Banana, Shepody, Agria and Yukon Gold

The following are considered moderately resistant:
Kennebec, Norland, Russet Burbank
, Pacific Russet and Purple Viking.

 

pH :

It is possible to amend the pH of your soil using both organic and no-organic methods. The ideal pH for potatoes is between 4.8 - 5.5, which is slightly more acidic than most vegetables prefer. In less Acidic soils, potatoes are more prone to scab.

 

A number of people have asked about scab. Bacteria that are present in most soils cause scab. The incidence of scab is dependent on the following factors: variety, soil, pH, and moisture.

Soil:
-High levels of organic mater increase the risk of scab, regardless of variety. If you have added large quantities of straw or manure to your garden site you have raised the percentage of organic matter and raised the risk of scab. Recently tilled pastures usually have higher levels of organic matter.
-Sandy soil, which is low in organic matter, has a low risk of scab.
-Dry years tend to be worse than wet years for scab. Scab only affects the appearance of the potato and does not affect the eating quality of the flesh of the tuber.
-In a dry year keeping the soil moist with watering is an excellent tool to reduce scab.


Green Sprouting

 

Growing without Synthetic Fertilizers
It has been 6 years that we have grown potatoes in our market garden without any fertilizers. It is possible to obtain yields similar to those archived with the use of synthetic fertilizers, it just takes a little more work. There are a couple options. Adding compost to the garden and mixing it in well is the easier option, if you have a good source of compost. Unfortunately I can not give you advice on how much to add to your garden as all compost will have different levels of nutrition.

Growing a cover crop "green manure" the year before you plant potatoes and tilling that into the soil. Legumes are often recommended as cover crops. Many of the vegetable seed companies now sell cover crop mixes that are great for building organic matter and improving soil nutrition.

 

Potatoes are heavy feeders. Over the next 3 years we plan to phase out the use of fertilizers in our Seed Potato Fields, but this is what we have been using for nutrition. If you want to use a synthetic fertilizer we recommend a 21-22-6-5. Important Micro Nutrients are .5% Boron and 1% Magnesium. It may be hard to find a fertilizer that contains this exact mix, do not worry. This formulation is only a base line that commercial potato growers use to maximize production. An important component to a good synthetic fertilizer mix is a combination of both readily available and slow release nitrogen. Too much nitrogen early on in the growth will result in an excess of leaves and plants lacking in tuber growth.

Mix in your nutrition. It doesn't matter if it is compost or synthetic fertilizers, it is very important to add your source of nutrition then stir up the soil where you will plant your potatoes. It is not healthy for the plants to be in close contact with excess amounts of concentrated minerals.


 


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