Light green colour with yellowing of leaf base, reduced growth and sparse ground cover due to lack of nitrogen.
Reduced growth and tillering, sometimes attended with purple discoloration.
Made worse by Acidic or very alkaline (calcareaus) soils. Low organic matter. Cold or wet conditions. Crops with a poorly developed root system. Soils with low P reserves. Soils with a high phosphate capacity. Iron rich soils.
PotassiumOlder leaves show tip chloroses and dieback. Diffuse brown blotches disperse on the leaf blade and coalesce to further necrosis.
Made worse by Acidic soils (low pH). Sandy or light soils (leaching). Drought conditions. High rainfall (leaching). or heavy irrigation. Heavy clay (illite) soils. Soils with low K reserves. Magnesium rich soils.
All leaves show an even, yellowgreen chlorosis.
Made worse by Acidic soils. Light, sandy soils (leaching). Low organic matter. Poorly aerated soils (waterlogged soils.) Areas with low industrial emissions.
Where possible, fixing deficiency through organic principles uses less energy, and preserves biodiversity.
agriculture, fertility, grass, organic, pasture, biodiversity