Temporal nitrate uptake pattern by winter annual legumes and small grains

absorption de substances nutritives cover plants cultivos de grano georgia (eua) georgia (usa) grain crops hiver invierno leaching lessivage du sol nitrate nitrates nitratos nutrient uptake plantas de cobertura plante de couverture pollution by agriculture pollution par l'agriculture secale cereale trifolium incarnatum triticum aestivum vicia villosa winter