STEM与日常科技·英语30篇（1）
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Agricultural Drones and Variable-Rate Fertilization
农业无人机喷洒与变量施肥
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Instead of applying fertilizer evenly across an entire field, modern drones use multispectral cameras to assess crop health zone by zone.
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Healthy green areas reflect more near-infrared light, while stressed or sparse patches show different spectral signatures.
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Based on this data, software generates precise application maps that tell drones exactly how much nitrogen or phosphorus each sub-area needs.
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Onboard GPS and real-time sensors allow drones to adjust spray nozzles mid-flight, matching dosage to plant density and soil type.
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This method cuts fertilizer use by 15–30%, reducing runoff into rivers and lowering farmers’ input costs.
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Drones also monitor pests and irrigation gaps, capturing changes faster than ground scouts or satellites.
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Small farms benefit especially — one drone operator can manage 200+ hectares daily, replacing hours of manual scouting.
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Regulations require certified pilots and approved chemicals, but battery life and weather sensitivity remain practical limits.