For fertiliser amounts its best to use the rate per ha divide by population per ha, that will give you the rate per plant. Its always wiser to split-apply the fertiliser though to avoid chances of burn because of the differences in micro-climatic conditions.

Dear Chapman koga

Thanks a lot for reply the question

For me your reply is little bit confusing. So,my question in another way,If I need to use only seed rate ,how can calculate the amount based on recommended dose by soil volume or by area of pot.

Well, the recommandation will differ in function of the seed you want to test. Tomato seeds will not be consiered as cereal seeds. But to avoid phytotoxicity, you may use volume of the container and the bulk density of the tested soil. You can also calculate the volume of the arable soil by multiplying the surface by the depth (10-15 cm for cereal, and 30 cm for tomato...). Then you can divide the amount of fertilizer by the volume obtained and report the result to the container volume.

I hope it helps

Khalid AZIM

Dear Khalid azim

Thanks a lot for reply the question

For me your reply is still need to be more clear. In my opinion for example you can adding fertilizer uses by volume soil because soil is resources of nutrient, but for seed rate I can calculate the amount based on area because different plant need different space to grow especially, if we like to grow plant from seed to seed .So, I am still I need strong justification for this issues or reference for this issue.

please check ur mail

Thanks alots

It depends on the crop you are targeting (its rooting depth).

Assuming you are simulating a situation of a wheat crop in a hectare of land:

If your rooting depth is 15 cm, your soil bulk density is = 1300 ton/m3

Then your soil mass in a hectare is 1,950,000 kg/ha

If your fertilizer rate is for instance 100 kg/ha of N, equivalent to 300 kg/ha of Ammonium nitrate (=300000 grams/ha), then the rate per kg of soil will be 300000/1,950,000=0,154 gr of Ammonium nitrate/kg of soil.

If you are working with a pot of 10 kg, your rate will be 1,54 gr Ammonium nitrate/pot

When working with pots it is difficult to add fertilizers as dry powder, it is preferable to dissolve the amont in distilled water and irrigate your pots with the equivalent of that brings you the rate you want.

Split if needed to avoid high salinity close to the seeds.

Dear professor Rachid Bouabid

Thanks a lot for reply the question

As far as I know we didn't calculate the depth of the soil/land when we conduct field experiments on a plot rather we calculate the plot area. I think we will follow the same procedure for pot experiments. Therefore, to calculate the seed rate and fertilizer rate for pot experiments, we will calculate the area of the pot using the formula: area of circle = π r².

In pot culture experiments we are stimulating actual field conditions. In actual field conditions, the fertiliser recommendation is per area basis. That is amount in kg/ha. But this amount is for one hectare area (10000 m2) with 15cm depth. This depth restriction also to be considered. In pot culture experiment, the depth of pots may vary. So entire volume of pot or weight of soil in the entire pot can not be considered while applying feetilisers, as this may lead to excess application. So the surface area of the pots need to be considered . First convert fertilizer rate in kg per ha area to g per cm2 area of the pot (πr2). Then apply the fertiliser. There should be a minimum depth of 15 cm for the pot. If not, we have to reduce the rate on rate per weight basis.