Soil Temperature and Seed Germination
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Judul : Soil Temperature and Seed Germination
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Many of the plants we grow I prefer to sow directly outside and one of the most important things to consider when sowing is that the temperature of the soil is high enough for the seed to germinate.
Other important considerations include:
This post we'll focus on soil temperature for germinating seeds. We'll look at why this is important, how to take soil temperature, and I've included a table showing the minimum and preferred soil temperatures for germination of some common plants.
Often you will find a monthly guide on a seed pack indicating when to sow seeds and this generally works okay, but can be misleading. If you have a long cold winter and the soil is cold, germination will be delayed and in some cases the seeds may rot in the ground. On the other hand, if the soil is unusually warm in the spring, it's possible to seed earlier. Being able to tell the soil temperature and being aware of the preferences of each plant will result in more or your seeds germinating.
You want to measure the temperature at seeding depth and this will differ for each seed you sow. The general rule is sow to a depth of no more than twice the diameter of the seed, but like I said above it's better to go too shallow than too deep.
Any thermometer that will measure temperature at a specific depth can be used to measure soil temperature. Insert the thermometer into the area where the seeds will be sown and wait a few minutes before you take a reading.
Bear in mind that each area of your garden will probably have a different temperature. The soil temperature is influenced by the following factors:
As the air temperature starts to warm up in early spring you may like to get a head start with your sowing and accelerate the warming of the soil. If you have a mulch on your soil for the winter you can temporarily remove the mulch. The dark coloured soil will absorb all wavelengths of light and convert them into heat, warming the soil much faster. Another alternative is to leave the mulch on and cover the bed with a plastic sheet or glass pane. On a sunny day this will provide considerable heat. Of course you can also remove the mulch and use the sheet or glass on the bare soil and this has the added benefit of germinating any seeds in the patch that can be pulled before you start sowing.
Here's a table providing the minimum and preferred soil temperature for a number of crop seeds and the estimated time it takes the seeds to germinate
Anda sekarang membaca artikel Soil Temperature and Seed Germination dengan alamat link https://howtoplanvegetable.blogspot.com/2017/02/soil-temperature-and-seed-germination.html
Judul : Soil Temperature and Seed Germination
link : Soil Temperature and Seed Germination
Soil Temperature and Seed Germination
A few days ago we sowed the tomato seeds for this season's market and home garden. It never ceases to amaze me what little indoor space you need to rear thousands of seedlings. We use two 50 cm x 30 cm x 15 cm trays to germinate approx 150 seedlings from 10 cultivars. When they get bigger we move them into two 1.3 x 8 m beds covered with polythene to rear them before they take their permanent positions in the gardens in early - mid April. |
| Tomato seedlings |
Many of the plants we grow I prefer to sow directly outside and one of the most important things to consider when sowing is that the temperature of the soil is high enough for the seed to germinate.
Other important considerations include:
- whether the seed requires any pre-treatment before it will germinate, i.e stratification and scarification (mainly relevant for perennial plants particularly trees and shrubs).
- how deep you sow the seed - too shallow is better than too deep.
- that the correct moisture levels are kept constant during the germination phase - not too wet, not too dry and with the ideal moisture levels similar to that of a wrung out cloth.
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| Elaeagnus commutata - Epigeal germination |
This post we'll focus on soil temperature for germinating seeds. We'll look at why this is important, how to take soil temperature, and I've included a table showing the minimum and preferred soil temperatures for germination of some common plants.
 |
| Eruca sativa - Rocket germinating |
Often you will find a monthly guide on a seed pack indicating when to sow seeds and this generally works okay, but can be misleading. If you have a long cold winter and the soil is cold, germination will be delayed and in some cases the seeds may rot in the ground. On the other hand, if the soil is unusually warm in the spring, it's possible to seed earlier. Being able to tell the soil temperature and being aware of the preferences of each plant will result in more or your seeds germinating.
Measuring Soil Temperature
Any thermometer that will measure temperature at a specific depth can be used to measure soil temperature. Insert the thermometer into the area where the seeds will be sown and wait a few minutes before you take a reading.
Bear in mind that each area of your garden will probably have a different temperature. The soil temperature is influenced by the following factors:
- Bare soil warms much faster than mulched soil and vegetated soil.
- Dry soil will be warmer than wet soils.
- South facing soils will be warmer than north facing, and the amount of shade cast on the soil will affect the temperature considerably.
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| Gingko biloba seedling |
Warming up the Soil
Here's a table providing the minimum and preferred soil temperature for a number of crop seeds and the estimated time it takes the seeds to germinate
Minimum and Preferred Temperatures for Common Crops
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| Basil Seedlings |
If you would like to create a forest garden and gain some practical hands on experience join us this Spring. We'll be covering site surveying, landscape design software, installing access, beds, irrigation channels, planting tree, shrub, herb and ground layers and making a small wildlife pond. All in 3 days! And plenty of follow up material to take away with you to digest slowly.
We offer a diversity of plants and seeds for permaculture and forest gardens including a range of fruit and nut cultivars. We Deliver all over Europe from Nov - March. Give a happy plant a happy home :)
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| The Bionursery |
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If you appreciate the work we are doing you can show your support in several ways.
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References
http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex1203
http://www.rodalesorganiclife.com/garden/plant-seeds-right-depth
http://www.rodalesorganiclife.com/garden/plant-seeds-right-depth
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