1. When should a soil sample be taken?A soil sample should be collected after harvesting the crop.FertilizersStraight (Single) FertilizerExample: UreaUrea contains 46% Nitrogen (N).100 kg of urea contains 46 kg of nitrogen.Therefore, to obtain 1 kg of nitrogen, about 2.17 kg of urea is required.Calculation:100 kg urea → 46 kg Nitrogenx kg urea → 1 kg NitrogenSo, 2.17 kg of urea provides 1 kg of nitrogen.Example: If a crop requires 40 kg of nitrogen, then:40 × 2.17 = 86.8 kg of urea is needed.2. Water TestingWhy should we do water testing?Water testing is done to check whether water is safe and suitable for drinking, agriculture, or other uses.Reasons for water testingTo check whether harmful bacteria, microorganisms, or other contaminants are present.To prevent water-borne diseases such as Typhoid.To determine whether the water is suitable for agriculture, industries, and household use.To ensure safe and healthy living by using clean water.Four important water testspH – Potential of HydrogenEC – Electrical ConductivityTDS – Total Dissolved SolidsBT – Bacterial Test
