Soil fertility and the nutritive value of crops.
D005308:Fertilizers; D005523:Food Supply / Q000592:standards; D009747:Nutritional Physiological Phenomena; D010940:Plant Proteins / Q000378:metabolism; D010945:Plants, Edible / Q000378:metabolism; D012987:Soil
D005308:Fertilizers; D010940:Plant Proteins; D012987:Soil