312 ... Elementary Principles of Agriculture 



449. Green Manuring. (See f 131). Prof. Shaw of 

 the California Experiment Station, reports the following 

 results which show the possibilities of deep plowing, and 



a single green manur- 

 ing on sandy soils 

 naturally lacking in 

 the qualities that 

 humus gives. First 

 a number of plots were 

 summer fallowed, and 

 in the fall plowed to 

 a depth of 6 inches, 

 harrowed and seeded 

 as indicated in the 

 table, except No. 1, 

 which was sown to 

 wheat continuously 

 and only double disced 

 after each harvest. 

 The other plots were 

 deeply plowed after 

 each harvest and sum- 

 mer fallowed. Com- 

 pare Figs. 199, 200 

 and 201. Also f 143. 



Fig. 201. Wheat plants from six plots treated 

 differently, showing comparative develop- 

 ment: 1, plot continuously seeded to wheat; 

 2, baref allowed; 3, horse beans grown and 

 plowed under after previous crop; 4, Can- 

 adian field peas grown and plowed under; 5, 

 rye and vetch grown and plowed under; 6, 

 rye grown and plowed under. 



YIELD OF WHEAT UNDER DIFFERENT SOIL TREATMENTS 



Yield per Acre 



