76 THE GRAPE ROOT-WOEM. 



of these operations was recognized at the outset of the experiment and 

 arrangements were made to give the vines thorough cultivation and 

 Hberal fertihzing in addition to thorough spraying with a poison and 

 a fungicide; in fact, to treat the vineyard according to the most 

 approved methods of vineyard management. 



That spring when the vineyard was pruned many of the badly 

 weakened vines were cut back to the ground and others to the lower 

 wire of the trellis. Even on the most vigorous vines, not more than 

 one to three fruit-bearing canes were left, it being thought desirable 

 to concentrate the remaining energies of the weakened vines and 

 force the vegetative growth rather than attempt to produce fruit of 

 an inferior quality such as was borne by the vines during the season 

 of 1906. In order that some light might be thrown on the effect of 

 different kinds and amounts of fertilizer used in restoring these 

 injured vines it was decided to divide the vineyard into seven plats 

 of one acre each and the following kinds and amounts of fertilizer 

 were applied : 



Plat I. Barnyard manure, 7 wagon loads. 



Plat II. Complete high grade commercial fertilizer, 1,000 pounds. 

 Plat III. Complete high grade commercial fertilizer, 1,000 pounds plus 100 pounds 

 sodium nitrate. 



Plat IV. Sodium nitrate, 400 pounds. 

 Plat V. High grade commercial fertilizer, 1,000 pounds. 

 Plat VI. High grade commercial fertilizer, 500 pounds. 

 Plat VII. No fertilizer; no spraying. 



The brand of fertilizer used in 1907-8 analyzed available phos- 

 phoric acid, 11.28 per cent; potash, 5.89 per cent; nitrogen, 3.41 

 per cent. In 1909 a brand of fertilizer was used analyzing phos- 

 phoric acid, 8 per cent; potash, 8 per cent; nitrogen, 5 per cent. 

 The plats commenced on the west side of the vineyard and ran east- 

 ward. Plats I, V, VI, and VII included seven rows measuring 

 approximately one acre in area. Plats II, III, and IV contained 14 

 rows each, but all the data here given are reduced to a 7-row or 1-acre 

 basis for convenience in comparison. The ground on which this 

 vineyard is planted is quite level and is of a stony loam on the west 

 side grading to an almost stoneless clay on the east side where it 

 has been somewhat enriched by wash from a slight elevation lying 

 immediately south, which doubtless is responsible for the greater 

 productivity of plats 5, 6, and 7, at the beginnmg of the experiment. 



The barnyard manure was spread broadcast over the rows of Plat 

 I during the month of April. The commercial fertilizer was dis- 

 tributed on the other plats in two equal applications, the first being 

 made May 21, when active growth of the vines commenced. The 

 second application was made June 18, about one month later. 



All of the fertilizer was applied with a broadcast fertilizer dis- 

 tributor and immediately followed by a spring-tooth cultivator. 



