22 BOARD OF AGRICULTURE. [Pub. Doc. 



Plat 1 was planted to beans in April of 1908, 1909, 1910, 1911 and 1912, 

 with millet following the beans in July, 1908, 1909, 1910 and 1911. 



Plat 2 was planted to potatoes in March, 1908, 1909, 1910 and 1911, 

 and crimson clover sown after the potatoes were dug each year. The 

 crimson clover was turned under for potatoes in the early spring of 1909, 

 1910 and 1911, and worked into the ground during the summer of 1912. 



Plat 3 was treated in all respects similar to plat 2, except that an ap- 

 plication of 1,500 pounds of hydrated lime per acre was given before 

 planting the potatoes in 1908, 1909, 1910 and 1911. 



Plat 4 was given an application of 15 tons of well-rotted stable manure 

 per acre before plowing for the potatoes in 1908, 1909, 1910 and 1911, 

 and for the corn in 1912. The potatoes were planted in March, and fol- 

 lowed by corn in July of each year. In 1912 the potatoes were omitted 

 from the rotation, and corn planted in May. The stable manure was 

 apphed immediately before planting the corn. 



Plat 5 was treated in all respects similar to plat 4, except an applica- 

 tion of 1,500 pounds of hydrated hme was given per acre after the manure 

 was turned under, and before the potatoes were planted in 1908, 1909, 

 1910 and 1911. 



All plats received equal amounts of commercial fertihzer during the 

 entire experiment. 



Plat 1 produced 6,829.71 pounds of kale per acre. 



Plat 2 produced 8,919.71 pounds of kale per acre. 



Plat 3 produced 13,824.00 pounds of kale per acre. 



Plat 4 produced 13,834.28 pounds of kale per acre. 



Plat 5 produced 16,893.91 pounds of kale per acre. 



Using the yield on plat 1, from which both the beans and miUet were 

 harvested, as the basis of comparison, the use of crimson clover in the 

 rotation inci'eased the yield 30.16 per cent, crimson clover and hme 102.4 

 per cent, stable manure 102.5 per cent, and stable manure and lime 145.9 

 per cent. 



The work on artificial manure should include a study of 

 the source of the various ingredients used. For instance, in 

 our work in Virginia W'e have found that the nitrogen for cer- 

 tain crops grown in the winter or early spring should be ob- 

 tained from one set of combinations, while for the same crop 

 growai in the later summer a different combination is desirable. 

 The form of phosphoric acid to be used depends quite as much 

 upon the condition of the soil as upon the crop which is to 

 receive it. There is still much work to be done on the various 

 sources of potash best suited for the different crops in any line 

 of agriculture. Where large quantities of commercial ferti- 

 lizers are used, there are almost certain to be deleterious re- 



