Farmers' Cooperative Experiments. 473 



(b) Lime. Trials may be made of the effect of one or more forms 

 of lime in one or more amounts per acre. 



(c) Green manures. Trial may be made of one or more crops 

 used as green manure to determine the effect of the humus produced 

 upon the succeeding crops and the returns from such practice. 



The above experiments with fertilizers may very well be combined 

 with some of the experiments with crops or with the study of crop rota- 

 tions, thereby reducing the area of land which might be used by the two 

 experiments run separately and increasing the information obtained. 

 It is particularly desirable that some such combination be arranged. The 

 two or more phases of such an investigation would still be directed by 

 the person at the College having charge of such work, but the combination 

 should be indicated in the application for co-operative work. 



No. 3. Tillage experiments. — (a) Study of ridge as compared with 

 level culture of hoed crops. 



(b) Study of deep as compared with shallow cultivation. 



(c) Study of the value of a soil mulch properly and continuously 

 maintained as compared with ordinary cultivation designed to keep 

 down weeds. 



(d) Study of the disc harrow or Meeker harrow and planker as 

 compared with the roller as clod crushers on clay soil. 



(e) Study of fall plowing as compared with spring plowing on clay 



soil. 



(f) Study of early spring plowing as compared with late spring 

 plowing on summer crops. 



X. UNPRODUCTIVE FIELDS OR SPOTS. 



T. L. Lyon. 



" It is requested that any one having a piece of soil on his farm that 

 is unproductive as compared with surrounding soil, communicate with 

 the department of Experimental Agronomy, New York State College of 

 Agriculture. An inquiry will be made into the cause of the difficulty and 

 if it is a matter of more than local importance, a careful investigation will 

 be made and an effort put forth to make the land productive." 



