8 DEPAKTMENT OF AGRICULTUEE BULS. 676-700. 



Department Bulletin No. 698. — Grain-sorghum Experiments in the 



Panhandle of Texas: Page. 



Introduction 1 



The Panhandle 2 



Location 2 



Altitude and drainage 4 



Soil 4 



Climatic conditions 4 



Pecent agricultural history 16 



The cereal field stations 16 



The grain-sorghums 17 



Classification 17 



Experimental conditions 20 



Varietal experiments 25 



Conclusions 89 



Department Bulletin No. 699. — Analysis op Experimental Work With 

 Ground Raw-rock Phosphate as a Fertilizer: 



Introduction 1 



History 2 



Theoretical- considerations 3 



Methods of studying the subject 5 



Results of experiments 28 



Experience of farmers with raw-rock phosphate as a fertilizer 112 



Summary 115 



Conclusions '. 118 



Department Bulletin No. 700. — Climate and Plant Growth in Certain 

 Vegetativs Associations: 



The problem 1 



The experiments 3 



Preparation of plants 4 



Planting 5 



Measurement of plants 14 



Experimental error 14 



Measurement of physical factors 16 



Comparison of the climatic characteristics of the three plant types 27 



Correlation between growth and environmental factors 41 



Summary 69 



Conclusions 71 



