TABLE OF CONTENTS. 



PAGE, 



Preface '. 5 



Introduction . .*. * 6 



PART I. 



Profitable Manuring 9 



Green Manuring 15 



Potash-Phosphate Manuring 19 



Plant Food must be Available to be Useful... 24 



Soil Improvement 27 



PART II. 



How to Experiment 29 



Simple Plan for Experimenting 32 



A more Elaborate Plan for Experimenting 33 



Precautions necessary in Making Experiments with 



Fertilizers 36 



Time of Applying Fertilizers 38 



PART III. 



Experiment Farm at Southern Pines* N G.. . , . 39 



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