580 Report of the Department of Horticulture of the 



following years the dried blood and nitrate of soda were withheld 

 from the mixtures and two applications of them made, one shortly 

 after growth started and the second two or three weeks later. In both, 

 the fertilizer was broadcasted and lightly harrowed in. The acid 

 phosphate and sulphate of potash were applied early and plowed 

 under. 



Using these materials at the rates just given, in 1909 we applied 

 72 pounds of nitrogen, 25.3 pounds of phosphorus (58 pounds of 

 phosphoric acid), and 59.3 pounds of potassium (108 pounds of 

 potash) per acre. In 1910, 1911, 1912 and 1913 we applied 56 

 pounds of nitrogen, 18.3 pounds of phosphorus (42 pounds of phos- 

 phoric acid), and 52.7 pounds of potassium (96 pounds of potash). 



COVER CROPS. 



Table IV shows the cover crops that have been used in this experi- 

 ment, the rates of seeding, the dates of. seeding and the time they 

 were turned under. 



Table IV. — Cover Crops Used in Grape Fertilizer Experiments. 



The time of sowing depended largely upon the amount of moisture 

 in the soil. The cover crops were turned under at the time the soil 

 was fit for working, though if the growth was not large the plow- 

 ing was delayed a little. Ordinarily the three-gang plow was used 

 in turning the crop under but if the work could not be thoroughly 

 so done, a two-horse plow with a chain was employed. 



CULTIVATION. 



The first detail of cultivation each year was the turning under 

 of cover crops. The plowing was up to the vines one year and the 



