INDEX. 



Page. 



Introduction ^ 



Agricultural Science and its Main Objects 5 



Artificial Fertilization 6- 



What is Plant Growth ? 7 



Wherein Consists Rational Fertilization 7 



The Requirements of Nutrition and Fertilization are not the same 8 



Plant-Growth 8 



Nitrogen Consumers and Nitrogen Gatherers 9 



Nitrogen Regulates Plant-Growth 1 1 



Table showing how many pounds of the constituents mentioned are withdrawn per 



acre by an average crop 12 



One-sided Fertilization does not pay I4 



The Necessity of Phosphoric Acid I5 



Wherein Consists the Potash Question 16 



Prof. Wagner on the Potash Question 18 



Prof. Wagner's Conclusions 20 



What is the Effect of Soda ? 24 



Prominent German Farmers on Potash Fertilization 24 



How does Prof. Wagner sum up the Situation ? 26 



The Amount of Potash removed by each Crop 28 



Potash and Barley 28 



Never Use Potash Alone 30 



The Various Potash Salts and Their Composition 31 



Natural Products of the Mines 32 



Kainit 32 



Carnallite 33 



Kieserite and Sylvinite 33 



Manufactured Articles Concentrated Potash Salts 33 



Sulphate of Potash 33 



Sulphate of Potash (Kali) and Magnesia (Double Manure Salts 33 



Calcined Kieserite 33 



Muriate of Potash 33 



Calcined Potash (Kali) Salts (Manure Salts) 34 



No Fertilizer Can Guarantee a Crop 34 



Prof. Stutzer's Advice Regarding Artificial Fertilization 34 



Experience with Potash in the United States 36 



lyist of Works Quoted From 39 



Illustrations : 



Peas on Poor Soil 40 



" Rich " 41 



Oats Poor " , 42 



Rich " 43 



Rye Poor " '. 44 



" Rich " 45 



Barley Poor " 46 



'* Rich '* o 46 



" Average Soil <,.... e, 47 



" with Potash Increased ,.roi-.H., 73 ct 47 



