Soil Health: Why Comprehensive Monitoring of Soil Matters

Soil Health: Need for Comprehensive Monitoring

• Soil is the foundation of food security, livelihoods and ecological stability. Healthy soil is not merely about the availability of nitrogen, phosphorus and potassium; it is a dynamic system comprising minerals, organic matter, microorganisms, water, air and physical structure. 
• Therefore, soil needs to be viewed not merely as an input-receiving medium but as a living natural resource.

Current Status of Soil Health Assessment

• India launched the Soil Health Card Scheme in 2015. Under the scheme, soil samples are tested for 12 parameters, including nitrogen (N), phosphorus (P), potassium (K), sulphur (S), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), boron (B), pH, electrical conductivity (EC) and organic carbon. Based on the results, farmers are provided with information on appropriate fertiliser application and soil amendments.
• The system aims to promote balanced fertiliser use and improve soil nutrient management. Government information has also indicated that soil-test-based fertiliser recommendations can contribute to savings in input costs and improvements in crop productivity.
• However, soil health assessment needs to go beyond chemical fertility. 
• Modern soil science recognises the importance of the physical and biological dimensions of soil health as well.

Why Is Biological Soil Health Important?

• Soil contains a wide range of organisms, including bacteria, fungi, algae, protozoa, earthworms and other soil fauna. These organisms contribute to nutrient cycling, decomposition of organic matter, soil aggregation and nutrient availability to plants.
• Therefore, it is not sufficient to know only the quantity of nutrients present in the soil. It is also important to understand how effectively biological processes are helping to cycle and make these nutrients available to plants.
• Organic carbon is an important indicator of soil condition. However, total soil organic carbon alone cannot fully capture the living biological processes operating within soil.

Major Concerns

• An analysis of Soil Health Card data covering a large number of soil samples has highlighted concerns regarding deficiencies in nutrients and organic carbon in Indian soils. Such findings underline the need for more balanced nutrient management and greater attention to soil organic matter.
• The issue is significant because declining soil quality can increase dependence on external inputs, raise cultivation costs and affect the long-term productivity and resilience of agricultural systems.

Need for Comprehensive Soil Health Assessment

• A comprehensive soil-health monitoring framework should incorporate three major dimensions:
• Chemical: pH, electrical conductivity, NPK, micronutrients and organic carbon.
• Physical: bulk density, soil structure, water-holding capacity, infiltration and erosion.
• Biological: microbial biomass, microbial diversity, enzyme activity, earthworm activity and active carbon.
• Such an integrated approach can provide a more accurate picture of the productive capacity and long-term resilience of agricultural soils.

Way Forward

• First, the Soil Health Card system should gradually evolve from a predominantly nutrient-recommendation system towards a broader soil-health assessment framework.
• Second, selected physical and biological indicators should be incorporated into regular soil testing in a phased manner. Digital platforms, GIS, remote sensing and emerging AI-based tools can support soil mapping and monitoring.
• Third, balanced fertiliser use should be complemented by practices such as composting, green manuring, biofertilisers, crop-residue management, crop diversification and appropriate crop rotation.
• Fourth, agricultural research and policy should give greater attention to soil organic matter, soil biodiversity, carbon sequestration and climate-resilient agriculture.

Conclusion

• The future of Indian agriculture depends not simply on increasing external inputs but on restoring and maintaining the natural productive capacity of soil. Healthy soil can support agricultural productivity, improve resource-use efficiency, contribute to carbon storage and strengthen ecological resilience.
• India therefore needs to move from a narrow focus on “soil fertility” towards comprehensive “soil health” and ultimately “soil ecosystem management.”
• Protecting the biological, physical and chemical foundations of soil is essential for ensuring food security and sustainable agriculture for future generations.

MCQ ENGLISH

Q. With reference to the Soil Health Card Scheme in India, consider the following statements:

1. It was launched in 2015.

2. It assesses soil parameters such as pH, electrical conductivity and organic carbon.

3. Its assessment is limited exclusively to nitrogen, phosphorus and potassium.

Which of the statements given above is/are correct?

(A) 1 and 2 only

(B) 2 and 3 only

(C) 1 and 3 only

(D) 1, 2 and 3

Answer: (A) 1 and 2 only

Explanation:

• The Soil Health Card Scheme was launched by the Government of India in 2015.
• The scheme assesses 12 parameters, including N, P, K, sulphur, micronutrients, pH, electrical conductivity and organic carbon.
• Therefore, its assessment is not limited to NPK.
• A comprehensive understanding of soil health also requires attention to physical and biological indicators.