CONTENTS. 



Department Bulletin No. 1039. — Experiments with Cereals on the 



Belle Fourche Experiment Farm, Newell, S. Dak.: Page. 



The cereal experiments 1 



Description of the field station 2 



Location 2 



History of the region 3 



Soil 4 



Native vegetation 4 



Climatic conditions 5 



Experimental methods 11 



Preparation of the land 11 



Plat experiments 11 



Nursery experiments 12 



Experiments on dry land 18 



Experiments with wheat 13 



Experiments with oats 27 



Experiments with barley 32 



Experiments with minor cereals 36 



Comparison of grain crops 41 



Experiments with flax 42 



Experiments on irrigated land 45 



Experiments with wheat 46 



Experiments with oats 52 



Experiments with barley 56 



Experiments with minor cereals 59 



Experiments with grain mixtures 62 



Comparison of grain crops 64 



Experiments with flax 65 



Tillage experiments , 69 



Summary 70 



Department Bulletin No. 1040. — Control of the Citrophilus Mealybug: 



Introduction 1 



History and distribution 2 



Economic importance 3 



Host plants 4 



Description and life history 4 



Seasonal history 6 



Relation to Argentine ant 8 



Comprehensive demonstrations of control 8 



Natural enemies 19 



Summary 20 



Department Bulletin No. 1041. — A Study op Sweet-potato Varieties, 

 with Special Reference to Their Canning Quality: 



Introduction 1 



Chemical composition of sweet potatoes 3 



Experimental canning tests 6 



Discoloration 13 



Heat penetration and sterilization 16 



Consistency 16 



Varieties and strains of sweet potatoes used in these tests 23 



Summary ^ 30 



Literature cited 33 



Department Bulletin No. 1042. — Effect op Winter Rations on Pasture 

 Gains of Calves: 



Outline of the experimental work 1 



The region and its problems 2 



Objects and plan of the work 3 



Kind of calves used 3 



Feeds used 3 



Character of pasture 5 



Method of feeding and handling the calves 5 



I . Winter rations and th eir influence on pasture gains of calves 6 



Quantity of feed consumed 6 



Gains during winter 7 



Gains during summer 8 



