4 in 1 Soil Test Solution Kit PH kalium Phosphorus Nitrogen Measuring Soil Test

Screw the cap tightly and shake the tube for a minute, lay the tube erectly for about 30 minutes. Ammonia nitrogen Put a small amount of soil (1--2g)into the 10ml tube,add 10 ml pure water. Screw the cap tightly and shake the tube for a minute, lay the tube erectly for about 30 minutes until.

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