Soil And Fertilizer Testing

Soil and Fertilizer Testing: What it Checks and Why it Matters

Plants take what they need from the soil, and fertilizer puts some of it back. The trouble is that neither can be judged by eye. Soil that looks rich can be short of phosphorus, and a bag of fertilizer can hold less nutrient than the label says, or more heavy metals than it should. Guessing leads to wasted money, weak crops and, in the worst case, polluted land. 

At METS Laboratories, we offer soil and fertilizer testing so that growers, suppliers and land managers can see what the soil has, what the fertilizer contains, and what the crop actually needs.

Soil and Fertilizer Testing

Soil and fertilizer testing is the laboratory analysis of soil and fertilizer samples to measure their nutrients, their condition and any contaminants.

• Soil testing: shows what the soil holds and how well it can feed a crop.
• Fertilizer testing: checks what is in the product, so you know what you are putting on the land.
• Together: the two results let you match the right product to the right soil.

Why is Soil and Fertilizer Testing Important?

A test turns a guess into a plan.

• Right amount of nutrients: too little limits growth, and too much is wasted or washes into water.
• Lower costs: you only buy and apply what the soil needs.
• Product quality: testing confirms that fertilizer matches its label.
• Safer land and crops: it picks up contaminants, such as heavy metals, before they build up in the soil.
• Better yields: healthy, balanced soil supports stronger crops over time.

What Does Soil Testing Check?

• pH: controls how easily plants can take up nutrients (BS 1377-3). 
• Organic matter: affects soil structure, water holding and nutrient supply (BS 1377-3).
• Moisture content: the water held in the soil, measured by oven drying (ASTM D2216).
• Main nutrients: nitrogen, phosphorus and potassium.
• Secondary nutrients: calcium, magnesium and sulphur.
• Micronutrients: iron, zinc, manganese, copper and boron.
• Salinity: measured as electrical conductivity, since salty soil stunts growth.
• Texture: the mix of sand, silt and clay.
• Heavy metals: where contamination is a concern.

What Does Fertilizer Testing Check?

• Nutrient content: nitrogen, phosphorus and potassium compared with the label.
• Secondary nutrients and micronutrients: where the product claims them.
• Heavy metals: such as cadmium, lead, arsenic and mercury.
• Moisture: which affects weight, storage and the real nutrient value.
• Organic matter: for compost and manure-based products.
• Physical properties: such as particle size, which affects how evenly it spreads.

Soil and Fertilizer Testing Process

1. Sampling: a sample is collected that represents the field or the batch.
2. Preparation: the sample is dried, ground, and mixed, and soil samples are digested in acid to bring metals and nutrients into solution (USEPA 3050B).
3. Analysis: ICP measures the nutrients and metals (USEPA 6010C), and other methods measure pH and salinity.
4. Reporting: the results are written up, with guidance on reading them.

Who Needs Soil and Fertilizer Testing?

Farmers and growers, fertilizer manufacturers and suppliers, landscapers, golf courses and sports grounds, organic producers, and consultants advising any of them.

METS Laboratories for Soil and Fertilizer Testing

• Soil and fertilizer in one place: test both together and match the product to the land.
• Nutrients and contaminants in one report: see what the soil or product holds and what should not be there.
• Recognised methods: metals and nutrients by USEPA 3050B/6010C, chemical tests to BS 1377-3 and soil moisture to ASTM D2216. 
• Instrument-based accuracy: ICP and spectroscopy for nutrients and metals. 
• Help reading the results: advice on turning numbers into a fertilizer plan. 

Conclusion

Healthy crops start with knowing what is in the soil and what is in the bag. A soil test shows what the land needs, and a fertilizer test shows whether the product delivers it safely. Together they help you spend less, avoid waste and protect the land for the next season. If you have samples to check, send METS Laboratories the sample details and the crop you are growing, and our team will advise on the right tests. 

Frequently Asked Questions

1. How to test soil for fertilizer? 

Ans: A soil test tells you which nutrients are low, so you know which fertilizer to use. There are two ways. A home test kit gives a quick check of pH and the main nutrients. A laboratory test is more accurate and covers more nutrients. 

2. How often should soil be tested? 

Ans: Every three to five years is common, and more often for intensive crops or if yields start to drop.

3. Does soil pH affect fertilizer? 

Ans: Yes. If the pH is too high or too low, plants cannot take up nutrients properly, even when plenty is present.

Soil Testing

Fertilizer Testing