Tamil terminology and scientific nature of humus
- Matku (மட்கு): The stable, colloidal organic substance formed when microorganisms completely decompose organic biomass.
- Karima Porul (கரிமப் பொருள்): Organic matter in general, which acts as the precursor raw material from which humus is derived.
- Humic and fulvic acids: Active biochemical fractions within humus that bind micronutrients and make them absorbable by crop roots.
Critical functions of humus in agricultural soils
- Improves water retention: Humus can absorb and hold several times its dry weight in water, helping crops withstand dry spells between irrigations.
- Enhances nutrient retention: Provides a high cation exchange capacity (CEC) that prevents vital nutrients from leaching away during heavy rains.
- Aerates soil structure: Binds loose sand particles into aggregates and loosens dense clay soils, encouraging vigorous root branching.
- Sustains soil biology: Serves as food and habitat for beneficial soil earthworms, mycorrhizal fungi, and nitrogen-fixing bacteria.
Practices to build soil humus in Tamil Nadu farmlands
High tropical temperatures accelerate the natural oxidation and loss of humus in Tamil Nadu soils. Farmers can replenish soil humus by regularly incorporating well-rotted Farmyard Manure (FYM), vermicompost, cultivating green manure crops like Sunnhemp and Dhaincha, and mulching with crop residues rather than burning stubble.
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Common questions
What is the Tamil meaning of humus?
Humus is called 'மட்கு' (Matku) or 'மட்கிய கரிமப் பொருள்' in Tamil.
Why is humus important for red and sandy soils in Tamil Nadu?
Humus dramatically increases the water-holding capacity and nutrient retention of sandy and red soils, preventing fertilizers from washing away.
Which green manure crops help increase soil humus in Tamil Nadu?
Sunnhemp, Dhaincha, and Sesbania rostrata are commonly grown and incorporated into the soil to boost humus and nitrogen.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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