Can Crop Rotation Improve Soil Health? What Farmers Should Know Before Repeating the Same Crop

the same crop repeatedly can make nutrient management harder and increase pressure from some pests and diseases. ICAR has recently urged farmers to use crop diversification, balanced fertilisation and resource-based crop planning to protect soil health and maintain farm productivity.

Crop rotation offers one way to change this pattern. Instead of growing the same crop season after season, farmers can alternate crops with different nutrient needs and rooting patterns. The right rotation can also include legumes, green manure and crop residues as part of wider soil management.

Different crops remove nutrients from soil in different quantities. When farmers repeatedly grow the same crop, certain nutrients can become depleted while others may accumulate, especially when fertiliser use does not match actual soil requirements.

ICAR-MGIFRI has advised farmers against continuous cereal-based cultivation because it can contribute to declining soil fertility, nutrient imbalance and greater dependence on fertilisers. Scientists have encouraged farmers to diversify crops and nutrient sources.

How does crop rotation change the field?

Rotation changes the crop growing in the field and therefore changes its nutrient demand, root system and residue characteristics. A cereal followed by a pulse, for example, creates a different sequence from growing cereals continuously.

This change can also affect pest and disease cycles. ICAR’s recent guidance on integrated pest management stresses prevention, regular monitoring and combining different control methods rather than relying on pesticides alone.

Legumes such as green gram and other pulses can work with nitrogen-fixing bacteria associated with their roots. This biological process can contribute nitrogen to the farming system and reduce the fertiliser requirement of a following crop under suitable conditions.

ICAR-MGIFRI has specifically encouraged farmers to include at least one legume in annual cropping systems. Scientists have also highlighted summer green gram and Dhaincha as options for improving soil fertility.

The amount depends on crop, variety, biomass, soil conditions and management. ICAR-MGIFRI reports that summer mungbean can fix around 25–30 kilograms of nitrogen per hectare, while Sesbania used as green manure can contribute around 50–60 kilograms under suitable conditions.

These figures should not be treated as a direct replacement for fertiliser on every farm. Farmers should still use soil tests and crop-specific recommendations to determine nutrient requirements for the following crop and avoid reducing fertiliser blindly.

Can green manure help?

Green manure crops are grown mainly to improve the soil rather than for harvesting grain. Dhaincha and sunhemp are examples that can be incorporated into the field before the next crop, adding organic material and supporting nutrient cycling.

ICAR-CRIDA lists green manuring with Dhaincha and sunhemp among soil-health practices. The institute also recommends combining crop rotation with soil testing, organic amendments, biofertilisers, compost and vermicompost.

Crop residues, roots and organic amendments add carbon-containing material to soil. Keeping suitable residues in the field can support soil structure, moisture conservation and biological activity, depending on how the material is managed.

ICAR-MGIFRI has highlighted residue retention and recycling as practices that can improve soil organic carbon, conserve moisture, support beneficial microorganisms and reduce nutrient losses. Farmers should select residue-management methods suited to their equipment and crop calendar.

Changing crops can interrupt the continuous availability of a preferred host for some pests and diseases. The effect depends on the particular pest, crop sequence, local climate and how long the alternative crop occupies the field.

Rotation is not a guarantee against pests. ICAR’s latest integrated pest-management guidance recommends combining crop planning with monitoring, cultural, biological, physical and chemical methods when needed.

Does rotation reduce fertiliser use?

It can reduce some nutrient requirements when the rotation includes legumes or green manure, but the result varies between farms. Farmers should not assume that adding one pulse crop automatically eliminates the need for nitrogen or other fertilisers.

ICAR recommends soil-test-based fertiliser management alongside crop diversification. Scientists in Bihar have specifically linked legumes, biological nutrient sources and balanced fertiliser use with lower dependence on chemical fertilisers.

The choice depends on the region, soil, irrigation and market. A farmer may combine cereals with pulses, oilseeds, vegetables or fodder crops where the crop calendar allows.

Farmers should consider the complete sequence rather than selecting crops individually. The following crop should fit the previous harvest date, available moisture, field preparation time, labour availability and local market demand.

Rice-based farmers can introduce pulses or other suitable crops where soil moisture and the growing period permit. ICAR-MGIFRI has promoted crop planning for rice-based systems and highlighted summer green gram as one option within diversified sequences.

The timing of rice also matters. Farmers need to select varieties and succeeding crops according to local planting windows. A rotation that leaves too little time between harvest and the next sowing can increase costs and reduce the benefit.

Soil testing helps farmers understand available nutrients before deciding how much fertiliser to apply. It can prevent farmers from following the same fertiliser schedule every year without knowing whether nutrient levels have changed.

ICAR-CRIDA has urged farmers to adopt soil-test-based balanced fertilisation. Its 2026 campaign also promoted soil sampling, organic amendments and biofertilisers as part of broader soil-health management.

Does crop rotation work everywhere?

There is no single rotation that suits every farm. Soil type, rainfall, irrigation, temperature, crop duration, machinery and market access all influence which sequence will work.

The Union Agriculture Minister recently stressed that crop planning should match local soil and water resources, agro-climatic conditions and local requirements. This means farmers should adapt rotations to their own farming conditions rather than copy a sequence from another region.

Farmers should avoid changing crops without checking water availability, planting windows and market demand. They should also avoid replacing fertiliser recommendations with assumptions about what a rotation will provide.

A diversified rotation works best when combined with balanced nutrition, suitable residue management, pest monitoring and timely sowing. Farmers should use recommendations from KVKs, agricultural universities or state agriculture departments for crop-specific decisions.

How can a farmer start?

A farmer does not need to redesign the entire farm at once. One practical approach is to introduce a suitable pulse or green manure crop into one field and compare soil conditions, input use and crop performance with fields under continuous cultivation.

Farmers can record fertiliser use, irrigation, pest incidence, yield and production costs for each sequence. Such records can show whether the rotation is improving the farm’s actual performance rather than relying only on general expectations.

Crop rotation is not simply about changing crops. It is about matching different crops, nutrient sources and field-management practices to the soil and water available on a farm.

ICAR’s recent soil-health programmes repeatedly link crop diversification with balanced fertilisation, legumes, green manures, residue management and soil testing. For farmers, these practices work best as parts of one crop-management plan rather than as isolated measures.