It all depends upon the type of farming you intend to practice.
Normally people use about 2.5 tons of sugarcane for seeding but I used 0.75 ton per acre with single budded setts.
the saplings were kept in plastic tea cups with holes and kept under shade for about a month . Then they were transplanted in the main field.
The more the distance between the crops the better the yield.
If you intend to employ machine cutting the space should be six feet minimum.
A practical suggestion is 6 feet between rows ( east - west ) and 4 feet between adjacent crops ( north - south ) in a row.
This arrangement helps the plants with sufficient sun light and air flow. The use of single budded setts as against the normal two or three budded setts avoids unnecessary competition for nutrients and results in stronger, taller and thicker sugar canes.
This is for row method of sugarcane cultivation.
If you want to employ pit method , you can dug pits at 5 feet intervals and replace the soil mixed with manure and use buds in a circular fashion ( about 32 buds for a single pit) .
Whatever method you use, don't burn the sugarcane trash but keep them on the oil which keeps the soil moist and avoids water evaporation. Normally sugarcane needs more water at weekly intervals. Initially water is to be made available near the roots and after 3 months you can make trenches farther apart so that the plants send their roots in search of water which will result in good production.
Hope this information helps.