January, 1919.] SOD, TILLAGE AND FERTILIZERS. 7 



chard have yielded sufficiently well, even under most adverse 

 conditions, to be profitable, that is, there is here the difference 

 between profit and loss. It would be useless for us to attempt to 

 deny the fact that there are sod orchards in the state that pay or 

 to argue that there are not certain advantages that pertain to 

 growing trees'in sod, but these are the exception and not the rule. 



THE EXPERIMENT. 



A description of the orchard together with the plots into which 

 it has been divided has been published in connection with the 

 various reports on this work which have appeared previously, 

 hence only a brief description of the plots need be repeated. 



Schedule of Treatment of Plots. 



Crimson clover is used as a cover crop in every case.* Seed 

 is sown July 10 at the rate of 20 pounds per plot. In seeding 

 plots 2 and 3 the following mixture is used: 



10 pounds red clover, 

 5 pounds white Dutch clover. 

 Plot 1 — Sod. To remain permanently in sod. Grass to be mown when in- 

 conveniently long and allowed to remain on the ground. No fertilizer 

 is applied. 

 Plot 2 — Cultivated the odd year, cover crop sown July 10, seeded the even. 



No fertilizer is applied. 

 Plot 3 — Cultivated the even year, cover crop sown July 10, seeded the odd. 



No fertilizer is applied. 

 Plot 4 — Clean Cultivation. This plot is plowed every spring and cultivated 

 every two weeks until September 1 . No cover crop is sown and no fer- 

 tilizer is apphed. 

 Plot 5 — Cultivation and Cover Crop. This plot is plowed each spring and 

 cultivated every two weeks. A cover crop consisting of 20 pounds of 

 crimson clover is then sown. No fertihzer is applied. 

 Plot 6 — Cultivation and cover crop with the following complete fertilizer per 

 tree: 



2 pounds nitrate of soda, 

 4 pounds sulphate of potash, 

 7 pounds basic skg. 

 Plot 7 — Cultivation and cover crop, with the following complete fertihzer 

 per tree: 



2 pounds nitrate of soda, 

 4 pounds sulphate of potash, 

 8 J pounds acid phosphate. 



* One season winter vetch was used with the clover and in another buck- 

 wheat was used. 



