If your NPK extractor shows N: 90ppm, P: 8ppm, K: 300ppm, you have a high nitrogen and potassium load but dangerously low phosphorus. Applying a balanced 10-10-10 fertilizer would make the potassium toxicity worse. Instead, you need a high-phosphorus supplement like bone meal or 0-20-0.
Lab cost: $15–40 per sample for full NPK. npk extractor
use water, filters, and pumps to wash beneficial organisms and nutrients off compost into a liquid form known as compost extract or "compost tea". If your NPK extractor shows N: 90ppm, P:
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