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Seed rate calculation


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  • 1. Seed Rate CalculationBy: Sayed Mohammad Naim KHALIDJan 2012Kabul, AfghanistanWhat is seed rate?Seed rate is the number of seeds to be planted in a specified surface or area to achieve anadequate stand. Seeding rates for cereals are still commonly given in figures of kilograms of seedper hectare or Jirib. Such rates are both convenient and useful to indicate the approximatequantity of seed that is required.Why understanding seed is rate important?The correct plant population is an important factor in maximizing yield of crops. It will help theoverall health of the plant and vigor of the plant. To obtain the targeted population it is necessarynot only to have quality sowing seed but also be able to accurately calculate seeding rates. It issurprising the difference a slight variation in seed size or germination makes to the seeding raterequired to achieve a target plant density. Seed size, quality and germination vary betweenvarieties, from year to year, from field to field and should be checked for each seed line to beused.How to calculating seeding rate?Tools1. Balance2. Calculator3. Paper and penProcedure1. Know your target population goal or plants per hectare2. Know the results of a germination test which provides an indication of expected plantestablishment in the field,3. Know the expected plant establishment4. Know Thousand Kernel Weight (TKW) for the seed to be planted.5. Finally, use the following formula to calculate seed rate𝑃𝑙𝑎𝑛𝑡𝑖𝑛𝑔 𝑅𝑎𝑡𝑒 =𝑇𝑎𝑟𝑔𝑒𝑡 𝑝𝑜𝑝𝑢𝑙𝑎𝑡𝑖𝑜𝑛 (𝑃𝑙𝑎𝑛𝑡𝑠ℎ𝑎)𝑆𝑒𝑒𝑑 𝑝𝑒𝑟 𝑘𝑔 𝑋 𝐸𝑠𝑡𝑎𝑏𝑙𝑖𝑠ℎ𝑚𝑒𝑛𝑡 % 𝑋 𝐺𝑒𝑟𝑚𝑖𝑛𝑎𝑡𝑖𝑜𝑛 %For example if the target plant population is 800,000 , the germination % is 0.9 and expected fieldestablishment % is 0.75. In addition we assume that if the size of wheat seed is average so in 1kg there will be 27500 seeds. Thus the result will be calculated as follow:𝑃𝑙𝑎𝑛𝑡𝑖𝑛𝑔 𝑅𝑎𝑡𝑒 =800,00027500 𝑋 0.75 𝑋 0.9= 43 (𝑘𝑔ℎ𝑎)We can also calculate the seed rate through the following formulas:Seeds/ha = Target plant population (plants/ha) ÷ Germination % ÷ Expected fieldestablishment %Planting Rate (kg/ha)= Seeds/ha ÷ Seeds/kgFor exampleSeeds/ha = 800,000 ÷ 0.9 ÷ 0.75 = 1185185Planting rate = 1185185 ÷ 27 500 = 43 kg/ha