Mr Farmer:
Super! As I am still unable to view pictures from certain sources where I am (sigh), I will need to get back to you about the cotyledon germinating before root growth. Normally, some expansion of the seed coat will take place, and moderate expansion of the cotyledon is to be expected.
Seed rot will take place if the seeds are dead. Usually, undamaged and healthy seeds would be able to twart most diseases, except maybe phytophtora and fusarium rot lar. Two-three inches deep is too deep for most seeds.... a 1 inch depth is more than sufficient actually. Don't worry about sturdiness; durian tap roots are very agressive in the early stages.
As for field planting, this depends on your planning part. If you're going to do grafting, it would be best to wait till the seedlings are at least 4 months old, do the graft, and keep for another 4 months before planting out. For such instances, you will need a large polybag to keep the seedlings prior to field planting.
optimus_shine:
Hmm... this is a trickier question to answer.
(1) If you get the right breed and the right market, it can be phenomenally good. I've kept Muscovy (large white duck) and Khaki Campbells (small brown duck) before, and both have their pros and cons.
(2) Your mom is right. Most duck breeds have not been inbred very much, so they do not have deleterious (diseased) genes retained in them. Also, ducks are naturally resistant to most common poultry diseases, again due to better genetics compared to chickens. As for growth rate, that is contentious; good tilapia breeds which are properly fed can reach 800g weights in 3-4 months, while ducks take similar durations as well.
Some information on ducks:
Muscovies bear very large, white eggs which are really value for money; and they are quite good layers, but don't expect more than 150 eggs a year.
Khaki Campbells are the most consistent egg laying duck breed, averaging 300 eggs a year. The eggs are medium to small, bluish tinged, and have a rather fishy smell (when raw).
Both produce very good salted eggs, just that for commercial scale, the Khaki Campbells are the more sought after breed due to the quantity produced, and the fact that it's a small bird (so can keep more per area space). Price-wise, the Muscovy salted eggs can fetch up to RM1 each; the Khaki Campbell salted eggs average at RM0.30-0.40 each.
Read this link for some comparison between ducks and chickens:
http://kit94.tripod.com/eDvsC.html Although I applaud your sense of entrepreneurship, I would like to caution against seeking for profits at the onset of your project. I mean, if you already have some hands-on experiences, then fine enough; but I'm guessing this is not the case.
For a good experience, try keeping 30 ducks in a 1000 square feet space, free range style. Do note that unlike chickens that need only about a few square feet space to remain happy layers, ducks won't lay eggs if they feel cooped up.
You will need to sex the ducks (through) venting so you get mostly females. Some people might contend this, but I find having 1 male to every 5 females help maintain the egg laying condition of the females.
To make sure you can find the eggs, prepare suitable nesting spots for the females before hand. Do remember that ducks like privacy when nesting, so each nest has to be significantly distant from the other. For Muscovies, I used a disused dog kennel kept about 1 foot above the soil, and a lined basket as a nest; for Khaki Campbells, they prefer nesting on the ground, so a shaded, slightly padded area would appeal to them.