💚 Lucerne (*Medicago sativa*)

Lucerne, also known as alfalfa, is one of the oldest and most valuable perennial fodder legumes. It is widely appreciated for its high protein content, repeated cutting ability, and role in improving soil fertility through biological nitrogen fixation.

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Why Lucerne Matters

Lucerne is important because:

• it provides highly nutritious fodder
• it can be harvested repeatedly over a long period
• it supplies protein-rich feed for dairy animals
• it helps improve soil health through its legume character

This makes it one of the most respected fodder crops in irrigated and semi-irrigated systems.

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Crop Identity and Adaptation

Lucerne belongs to the species Medicago sativa. It is a perennial leguminous fodder crop and is especially useful where farmers need long-duration fodder supply from one establishment.

Agronomically, it is known for:

• deep rooting
• repeated regrowth
• strong response to good management

Because of this deep-rooted nature, lucerne is also recognized as a crop that can help rejuvenate tired soils when managed properly.

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Climate and Soil Requirements

Lucerne grows best under moderate climatic conditions. It does not perform well under very hot or very severe cold extremes.

The crop prefers:

• mild to moderate climate
• well-drained fields
• non-acidic soils

Deep loamy soils are especially suitable. Acidic soils are unfavorable, and the crop generally requires a soil reaction above about pH 6.5. Where soils are acidic, liming becomes important.

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Varietal Importance

Lucerne varieties differ in:

• vigor
• regeneration capacity
• number of cuttings
• herbage quality

In agronomy, the practical lesson is that varietal choice affects not only annual fodder yield, but also persistence and regrowth after each cut.

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Sowing and Establishment

Lucerne is generally established through seed. Important sowing principles include:

• use clean seed
• maintain suitable row spacing
• sow in a fine seedbed
• ensure proper field leveling and drainage

Because lucerne is a legume, Rhizobium inoculation is important, especially if the crop is being grown for the first time in that field.

Some references mention seed soaking to help establishment in hard-coated seed lots, but the core agronomic principle is that good seed quality and inoculation matter greatly.

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Nutrient and Water Management

Lucerne responds well to:

• farmyard manure
• phosphorus
• balanced fertility

Although the crop fixes nitrogen biologically, initial nutrition and proper phosphorus management are still essential for strong establishment and repeated regrowth.

Irrigation scheduling is important because lucerne is harvested multiple times. The crop must have enough moisture for regrowth, but waterlogging must be avoided.

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Cutting Management and Yield

Lucerne is managed as a repeated-cut fodder crop. Its productivity depends on:

• timely first cut
• correct interval between subsequent cuts
• avoiding severe stress between cuttings

If harvested too early, fodder quantity falls; if harvested too late, quality declines and regrowth may slow. So cutting management must balance:

• biomass production
• leafiness
• crude protein
• regrowth potential

This multi-cut management is the central agronomic feature of lucerne.

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Seed Production and Special Management

If the crop is intended for seed production, normal fodder-cutting schedules must be adjusted. Frequent cutting is not compatible with good seed set, so a specific seed-production phase is needed.

Lucerne also requires attention to parasitic weeds such as Cuscuta, which is a well-known exam fact linked to this crop.

Summary Cheat Sheet

• Lucerne is Medicago sativa.
• It is a perennial fodder legume.
• It is valued for high protein, multi-cut ability, and soil improvement.
• The crop prefers deep, well-drained loamy soils.
• Acidic soils are unsuitable unless corrected; lucerne generally needs soil pH above 6.5.
• Rhizobium inoculation is important in new fields.
• The crop responds well to FYM and phosphorus.
• Lucerne is managed as a repeated-cut fodder crop.
• Cutting stage must balance yield, quality, and regrowth.
• Cuscuta is an important parasitic weed associated with lucerne.

References

2 sources • [1] [2]

[1]

ICAR e-Course: Agronomy

[2]

Ministry of Agriculture & Farmers Welfare