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Seed rate calculation

K
Krishnamayee Sethi

This document provides examples of how to calculate the seed rate per hectare for different crops. It lists the key factors needed for calculation such as spacing, germination percentage, purity percentage, 1000 grain weight, and plant population per hectare. It then shows step-by-step calculations for seed rates of various crops like mung bean, pigeon pea, groundnut, green gram, jute, maize, upland rice, and rice. The calculations follow a consistent formula and take into account additional needs like seeds for gap filling.

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Seed rate calculation
How do I calculate seed per hectare?
Quantity of seed sown per unit area. The seed rate depends on spacing or plant population, test weight, germination percentage. Seed rate (kg/ha)= 巨巨巨. 諮諮諮諮諮諮諮 ( )
1. Calculate the seed rate of mung bean for sowing 1 hectare of crop from the following: spacing=30cm10cm germination %=92% purity %=85% 1000 grain weight =36g Solution: Plant population= 10000 0.30.1 =333333.33 Seed rate = 333333.3336100100 928510001000 =15.34 kg/ha (Ans).
2. Calculate the seed rate of pigeon pea for sowing 1 hectare of crop from the following: spacing=60cm25cm germination %=87% purity %=86% 1000 grain weight =70g Solution: Plant population= 10000 0.60.25 =66666.67 Seed rate = 66666.6770100100 878610001000 =6.23 kg/ha (Ans).
3. Calculate the seed rate of ground nut for sowing 1 hectare of crop from the following: spacing=50cm20cm germination %=92% purity %=95% 1000 grain weight =200g shelling%=60% Solution: Plant population= 10000 0.50.2 =100000 Seed rate of kernels= 100000200100100 929510001000 =22.8823 kg/ha Quantity of unshelled pods needed for sowing in kg/ha = 100/6023=38.33 kg/ha (Ans).
4. Calculate the seed rate of green gram for sowing 1 hectare of crop from the following: spacing=45cm10cm germination %=80% 1000 grain weight =48g Solution: Plant population= 10000 0.450.1 =222222.22 Seed rate= 222222.2248100 8010001000 =13.33 kg (Ans).
5. Calculate the seed rate of Jute for sowing 1 hectare of crop from the following: spacing=25cm10cm germination %=90% purity percentage= 85% test weight =6.5g Solution: Plant population= 10000 0.250.1 =400000 Seed rate= 4000006.5100100 908510001000 =3.39 kg (Ans).
6. Calculate the quantity of maize seed for sowing 1 hectare of crop from the following: spacing=75cm20cm germination %=90% purity percentage= 90% test weight =250g seed required for gap filling=5% of total weight of seeds. Solution: Plant population= 10000 0.750.2 =66666.67 Seed rate= 66666.67250100100 909010001000 =20.576 kg Amount of seed required for Gap filling= 5 100 20.576= 1.028 kg Total seed required for 1 hectare area= 20.576+1.028=21.604 22kg/ha (Ans).
7. Calculate the seed requirement for upland rice for sowing 1 hectare of crop from the following: spacing=20cm30cm germination %=95% purity percentage= 90% test weight =25g No. of damaged seeds by birds, which are to be replaced 10seeds per square meter i.e., 10/m族. Solution: Plant population= 10000 0.20.3 =166666.67 Replacing bird damaged seeds, 1m族 area= 10 seeds 10000m族 area= 100000seeds Total no. of plant population= 166666.67 +100000=266666.67 Seed rate= 266666.6725100100 959010001000 = 7.798 kg/ha (Ans).
8. Calculate the seed requirement for rice in kg/ha for sowing 1 hectare of crop from the following: spacing of hill=20cm20cm No. of seedlings per hill=3 germination %=95% purity percentage= 90% test weight =25g seedlings required for gap filling=12/5 m族 area Solution: Plant population= 10000 0.20.2 =2500003= 750000 Seedlings required for gap filling. For 5m族 seedlings required= 12 For 10000m族= 12/510000=24000 seedlings. Total plant population= 750000+24000=774000 Seed rate= 77400025100100 959010001000 =22.63 kg/ha (Ans).
Seed rate calculation

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Seed rate calculation

  • 2. How do I calculate seed per hectare?
  • 3. Quantity of seed sown per unit area. The seed rate depends on spacing or plant population, test weight, germination percentage. Seed rate (kg/ha)= 巨巨巨. 諮諮諮諮諮諮諮 ( )
  • 4. 1. Calculate the seed rate of mung bean for sowing 1 hectare of crop from the following: spacing=30cm10cm germination %=92% purity %=85% 1000 grain weight =36g Solution: Plant population= 10000 0.30.1 =333333.33 Seed rate = 333333.3336100100 928510001000 =15.34 kg/ha (Ans).
  • 5. 2. Calculate the seed rate of pigeon pea for sowing 1 hectare of crop from the following: spacing=60cm25cm germination %=87% purity %=86% 1000 grain weight =70g Solution: Plant population= 10000 0.60.25 =66666.67 Seed rate = 66666.6770100100 878610001000 =6.23 kg/ha (Ans).
  • 6. 3. Calculate the seed rate of ground nut for sowing 1 hectare of crop from the following: spacing=50cm20cm germination %=92% purity %=95% 1000 grain weight =200g shelling%=60% Solution: Plant population= 10000 0.50.2 =100000 Seed rate of kernels= 100000200100100 929510001000 =22.8823 kg/ha Quantity of unshelled pods needed for sowing in kg/ha = 100/6023=38.33 kg/ha (Ans).
  • 7. 4. Calculate the seed rate of green gram for sowing 1 hectare of crop from the following: spacing=45cm10cm germination %=80% 1000 grain weight =48g Solution: Plant population= 10000 0.450.1 =222222.22 Seed rate= 222222.2248100 8010001000 =13.33 kg (Ans).
  • 8. 5. Calculate the seed rate of Jute for sowing 1 hectare of crop from the following: spacing=25cm10cm germination %=90% purity percentage= 85% test weight =6.5g Solution: Plant population= 10000 0.250.1 =400000 Seed rate= 4000006.5100100 908510001000 =3.39 kg (Ans).
  • 9. 6. Calculate the quantity of maize seed for sowing 1 hectare of crop from the following: spacing=75cm20cm germination %=90% purity percentage= 90% test weight =250g seed required for gap filling=5% of total weight of seeds. Solution: Plant population= 10000 0.750.2 =66666.67 Seed rate= 66666.67250100100 909010001000 =20.576 kg Amount of seed required for Gap filling= 5 100 20.576= 1.028 kg Total seed required for 1 hectare area= 20.576+1.028=21.604 22kg/ha (Ans).
  • 10. 7. Calculate the seed requirement for upland rice for sowing 1 hectare of crop from the following: spacing=20cm30cm germination %=95% purity percentage= 90% test weight =25g No. of damaged seeds by birds, which are to be replaced 10seeds per square meter i.e., 10/m族. Solution: Plant population= 10000 0.20.3 =166666.67 Replacing bird damaged seeds, 1m族 area= 10 seeds 10000m族 area= 100000seeds Total no. of plant population= 166666.67 +100000=266666.67 Seed rate= 266666.6725100100 959010001000 = 7.798 kg/ha (Ans).
  • 11. 8. Calculate the seed requirement for rice in kg/ha for sowing 1 hectare of crop from the following: spacing of hill=20cm20cm No. of seedlings per hill=3 germination %=95% purity percentage= 90% test weight =25g seedlings required for gap filling=12/5 m族 area Solution: Plant population= 10000 0.20.2 =2500003= 750000 Seedlings required for gap filling. For 5m族 seedlings required= 12 For 10000m族= 12/510000=24000 seedlings. Total plant population= 750000+24000=774000 Seed rate= 77400025100100 959010001000 =22.63 kg/ha (Ans).