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Pesticide, Disinfectant, and Fertilizer Calculations and Waste Management (Common)

Agriculture (SSW 2) · 農業(2号) · Written by Tokutei Pass based on the official study texts; not copied verbatim.

Safe Pesticide Use Standards, Storage, and Protective Gear

Before applying pesticides, check the registered label and strictly follow the target crop, dilution ratio, application timing (pre-harvest interval), and maximum total applications.

Wear protective goggles, a respirator mask, impermeable gloves, and protective clothing, and spray in calm weather from upwind to prevent spray drift onto neighboring crops.

After application, record the date, location, crop, pesticide name, and amount/dilution, and store pesticides in a locked dedicated cabinet (never transfer them into beverage bottles).

Key points


  • Strictly observe the target crop, dilution ratio, pre-harvest interval, and total application count on the label.

  • Wear proper PPE, prevent pesticide drift, and maintain accurate application records.

  • Store pesticides in a locked cabinet and never transfer chemicals into drinking bottles.
WordMeaning
dilution ratio / factor
pre-harvest interval (PHI)
pesticide drift
dedicated locked storage cabinet

Dilution Calculations for Pesticides and Disinfectants

In pesticide and barn disinfectant dilution calculations, convert liters to milliliters (1 L = 1,000 mL) and use the formula: Required Concentrate = Total Solution Volume ÷ Dilution Ratio.

For example, preparing 100 L (100,000 mL) at 1,000x dilution requires 100,000 mL ÷ 1,000 = 100 mL; preparing 200 L at 500x dilution requires 200,000 mL ÷ 500 = 400 mL.

Conversely, diluting 50 mL of concentrate by 2,000x yields 50 mL × 2,000 = 100,000 mL = 100 L of solution. Preparing 40 L of a 200x footbath disinfectant requires 40,000 mL ÷ 200 = 200 mL of concentrate.

Dilution Calculations for Pesticides and Disinfectants

Key points


  • Basic dilution formula: Concentrate Volume (mL or g) = Total Solution Volume (mL) ÷ Dilution Factor.

  • 100 L at 1,000x dilution requires 100 mL of concentrate; 200 L at 500x dilution requires 400 mL.

  • To make 40 L of 200x disinfectant for a footbath trough, measure out 200 mL of undiluted concentrate.
WordMeaning
volume of undiluted concentrate
total spray solution volume
footbath disinfection trough
measuring / weighing

Three Primary Fertilizer Nutrients and Application Rate Calculations

The three primary fertilizer nutrients are Nitrogen (N: leaf/stem growth), Phosphorus/Phosphate (P: flowering and fruiting), and Potassium/Potash (K: root and tuber development).

Basal fertilizer (motogoe) is applied before planting, while topdressing (tsuihi) is applied during growth. The required actual fertilizer weight is calculated as: Required Nutrient Weight ÷ (Nutrient Percentage ÷ 100).

For example, applying 12 kg of nitrogen per 10a using a compound fertilizer containing 15% N requires 12 kg ÷ 0.15 = 80 kg of fertilizer. Applying 10 kg of N using a 20% N fertilizer requires 10 kg ÷ 0.20 = 50 kg.

Key points


  • The three primary elements are Nitrogen (N: leaf fertilizer), Phosphorus (P: fruit fertilizer), and Potassium (K: root fertilizer).

  • Formula: Actual Fertilizer Weight (kg) = Required Nutrient Amount (kg) ÷ (Nutrient Content % ÷ 100).

  • To supply 12 kg of nitrogen using a 15% N fertilizer, 12 ÷ 0.15 = 80 kg of actual fertilizer is required.
WordMeaning
three primary fertilizer elements (N-P-K)
basal fertilizer and topdressing
compound chemical fertilizer
nutrient content percentage

Disinfectant Properties and Agricultural & Livestock Waste Management

Before disinfecting barns, wash away manure and dirt (organic matter) thoroughly. Inverted soap (quaternary ammonium) and chlorine disinfectants rapidly lose effectiveness in the presence of organic matter.

Slaked lime (strongly alkaline) generates heat when wet and requires eye protection; against coccidial oocysts, ortho-dichlorobenzene disinfectants and steam/boiling water are effective.

Used agricultural plastics, empty pesticide containers, and used needles must never be burned in the open; dispose of them as regulated industrial/medical waste. Under the Livestock Excreta Act, manage manure in roofed, walled facilities with impermeable floors and purify wastewater via the activated sludge process.

Key points


  • Always wash off organic matter before disinfecting; wear eye protection when handling strongly alkaline slaked lime.

  • Open burning or illegal dumping of waste agricultural plastics, pesticide containers, and veterinary needles is strictly prohibited.

  • Under the Livestock Excreta Act, avoid open piling and unlined pits; use impermeable floors/tanks and aerobic composting.
WordMeaning
slaked lime (strongly alkaline)
industrial waste
Livestock Excreta Act
activated sludge process

Pesticides, Fertilizer Calculation and Waste

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Official references