Let’s Live! 1961
They include: Different Soils, Different Plant Compositions (Natural Laws Regarding Soils and Plant Compositions); Different Soils . . . (Depleted Soils--Species Extinction); Different Soils . . . (Soil Organic Matter Mobilizes the Phosphorus for Plants); Different Soils . . . (Soil Organic Matter Mobilizes the Phosphorus for Plants); Different Soils . . . (Depleted Soils Change Sugar, Starch, Proteins and Yields of Crop); Mobilizing the Natural Soil Potassium; Nitrates . . . Possible Poison Grown into Foods; To Keep the Soil a "Living" One; Soil's Resurrection in Three Years; Schedule of Soil Fertility Delivery and Crop Growth; Schedule of Soil Fertility Delivery and Crop Growth; An Old Problem--Loss of Applied Nitrogen.