Determine how many plants your planting rate will produce A farmer asked how many seeds he would have per square foot if he planted 5g thousand kernel weight (TKW) seed at 5.5 lb/acre. Here are the calculation steps: 1. Convert pounds per acre to grams per acre.
Multiplying 5.5 lb/acre by 454 (the amount of grams in a pound) yields 2,497 g/acre. Use TKW to compute the number of seeds per acre. Divide 2,497 by the TKW and multiply by 1,000 to obtain the number of seeds per acre.2,497 ÷ 5 x 1,000 = 499,400 seeds per acre.3. Divide by the number of square feet in an acre (43,560) to obtain the number of seeds per square foot.499,400 divided by 43,560 equals 11.5 seeds per square foot.
Determine how many plants your planting rate will produce
How do you calculate seed rate?
Sowing rate (kg/ha) = target plant population (p/m2) × TGW (g) x 100.0% germination x percentage of emergence.
Definition, Formula, Objectives, and Factors of Seed Rate Seed rate is the amount of seed required per unit area of land to successfully cultivate any crop. In other words, the amount of seed necessary to effectively cultivate a crop on a specific piece of land is known as the seed rate for that crop on that land.
How is the germination rate computed?
Calculating results To get the germination percentage, divide the number of healthy seedlings by the total number of seeds used in the experiment, then multiply by 100. If you began with 25 seeds and ended up with 20 healthy sprouts, your germination rate would be 80%.
The plant population per hectare was estimated using the following formula (Adebooye et al.2006) : Pp = /, with Pp = plant population per hectare.
Why is the seeding rate so crucial?
Why is it vital – When plants are too closely spaced, the stems are frequently weak, which can lead to lodging and yield loss during heading. Economic costs might be direct in terms of yield loss owing to poor crop stand (too many or too few plants) or indirect in terms of increased seed cost when high seed rates are utilized.
Why is seed calculation so important?
Tillage management: Establish a solid foundation and compute seeding rate This week, several cultivators have seed drills in operation. Many more people are purchasing seed; ensure that your calculations are accurate regardless of the task you are performing.
- No matter the crop, it is vital to calculate the seeding rate based on the expected plant establishment in order to create a plant stand with a good production potential.
- As the thousand grain weight (TGW) varies, the seeding rate will vary from year to year, between varieties, and with various seed lots.
Calculating seed rate involves the following:
- The desired plant density (plants/m2)
- The total seed weight
- The estimated proportion of plant establishment.
- As ground conditions are favorable and soil temperatures are on the rise, the establishment rate should be high under present conditions.
- March plantings of spring barley are anticipated to have an establishment rate of roughly 85 percent.
The goal plants/m2 for barley seeded until the middle of March is around 280, while the target plants/m2 for barley sown before the end of March is 300. In April, the target plants/m2 should rise. In addition, the percentage of establishments will climb at the end of April, when temperatures will be significantly higher. Target plants/m2 for spring barley (Teagasc source):
- Up till mid-March – 280 plants per square meter (85% establishment)
- Mid- to late-March: 300 plants/m2 (85 percent emergence)
- Early to mid-April: 300 plants per square meter (85 percent establishment)
- Late April – 325 plants/m² (90% establishment).
Target plants/m2 for spring oats (Teagasc):
- Up to mid-March – 325 plants per square meter (85% establishment)
- Mid- to late-March: 350 plants/m2 (85 percent emergence)
- Early to mid-April: 350 plants/m2 (85 percent emergence)
- Late April – 350 plants/m² (90% establishment).
Spring wheat plants/m2 (Source: Teagasc):
- February: 300 plants/m2 (80% emergence)
- Early to mid-March: 325 plants/m2 (85 percent emergence)
- Mid-March to early April: 350 plants per square meter (85% establishment).
Target plants/m2 for spring beans (Teagasc source):
- February: 30 plants/m2 (75 percent emergence)
- March – 30 plants per square meter (85% establishment)
- April – 35 plants/m² (95% establishment).
Tillage management: determine seed rate and get started to a strong start
