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Water quality --- Nutrient pollution of water --- Plant nutrients --- Environmental aspects --- Pennsylvania.

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Plante de culture --- Crops --- Nutrition des plantes --- plant nutrition --- Fertilisation --- Fertilizer application --- Besoin nutritionnel --- nutritional requirements --- Modèle --- Models --- Productivité --- Productivity --- Rendement --- Yields --- Diversification --- Jachère --- fallow --- nutriënten --- 631.559 --- 631.81.031 --- 631.816 --- Crop yields --- -Crops --- -Plant nutrients --- -Nutrients, Plant --- Plant growing media --- Agricultural crops --- Crop plants --- Farm crops --- Industrial crops --- Farm produce --- Plants, Cultivated --- Agronomy --- Crop science --- Plant products --- Field crops --- Yields, Crop --- Agricultural productivity --- Soil productivity --- Harvest yield --- Absorption, uptake of nutrients --- Application and distribution of fertilizers --- Mathematical models --- Nutrition --- -Mathematical models --- crop production --- nutrients --- -Harvest yield --- 631.816 Application and distribution of fertilizers --- 631.81.031 Absorption, uptake of nutrients --- 631.559 Harvest yield --- -631.816 Application and distribution of fertilizers --- Nutrients, Plant --- Plant nutrients --- Nutrition&delete& --- Von liebig --- Mitscherlich --- Liebscher --- Michaelis-menten