Multiply 43.56 by the pounds of grass seed for each 1,000 square feet (92.9 square m) to get the amount of grass seed needed per acre (hectare). For example, if you have a grass seed mixture that recommends 4 lbs. (1.8 kg) per 1,000 square feet (92.9 square m), then you would need 43.56 x 4 = 174.24 lbs.
http://www.wikihow.com/Calculate-Grass-Seed-Per-Acre
The range is from 100,000 to 300,000 seeds per acre. A major seed company recently recommended planting 200,000 to 230,000 seeds per acre. Research at Iowa State University has shown that a lower seeding rate will give top yields.
http://www.ipm.iastate.edu/ipm/icm/1998/4-27-1998/soyseed.html
1 The average range for cool season grass seed is 35 to 60 seeds per square foot (0.09 m).  The average range for warm season grass seed is 20 to 50 seeds per square foot (0.09 m).
http://www.wikihow.com/Calculate-Grass-Seed-Per-Acre
How much grass seed per square foot should I use? Water the newly seeded area every two days until the grass is 6 inches tall, then reduce watering to three times a week. Apply 250 pounds of fertilizer per acre three months after planting, and apply the same amount three times each year. Maintain established pasture grass at 6 to 10 inches high.
https://www.reference.com/home-garden/much-grass-seed-need-per-acre-95c6acc548390912
Seed costs range from about $10 to more than $20 for a 50-pound bag of seed in today's market. For example, if the seed size is 2,500 seeds per pound, there would be 25,000 less seeds in a 50-pound bag than in a 60-pound bushel of soybean seed.
http://www.ipm.iastate.edu/ipm/icm/1998/4-27-1998/soyseed.html
A reduction in seeding rate of 50,000 seeds per acre could reduce seed costs by as much as $8 per acre if the seed cost is $20 per bag and the seed size is 2,500 seeds per pound. The savings per farm could be significant if a large number of acres is planted. For example, $8 ¥ 500 acres equals a savings of $4,000.
http://www.ipm.iastate.edu/ipm/icm/1998/4-27-1998/soyseed.html
1 The average range for cool season grass seed is 35 to 60 seeds per square foot (0.09 m). 2  The average range for warm season grass seed is 20 to 50 seeds per square foot (0.09 m).  Consider attributes of the land in order to fine tune grass seed calculations.
http://www.wikihow.com/Calculate-Grass-Seed-Per-Acre
Currently, production of pumpkin in the United States is more than 1 billion pounds annually, generating over $100 million in farm receipts from around 50,000 acres. Production in the northeastern United States is estimated at almost 25,000 acres.
http://extension.psu.edu/business/ag-alternatives/horticulture/melons-and-pumpkins/pumpkin-production
A newly seeded pasture or large field requires 50 to 100 pounds of grass seed per acre. For an established field that has bare patches, use 20 to 30 pounds of grass seed to over-seed each acre. Rake the seed so that it is lightly covered up to 1/2 inch.
https://www.reference.com/home-garden/much-grass-seed-need-per-acre-95c6acc548390912
Check the grass seed rate on the bag or with the grass seed manufacturer. 1  For example, Kentucky bluegrass is often recommended at 1.5 to 2 lbs. (680 to 907 g)per 1,000 square feet (92.9 square m); tall fescue is 6 to 8 lbs. (2.7 kg to 3.6 kg).  Most grass seed mixes recommend 4 to 5 lbs.
http://www.wikihow.com/Calculate-Grass-Seed-Per-Acre
how many seeds per acre
There are 100,000 to 300,000 seeds per acre.