POTATO EXPERIMENTS IX I9O3. I45 



BOVEE. 



Unsfrayed. 1 Sprayed. 



Aug. 21. Vines small, good color. A | Aug. 21. Merlin 111 vine. Probably no 



few leaves blackened by ; blight, 

 blight. 



Aug. 26. A good deal of blight. 



Sept. 1. Leaves all dead. Stems yel- 

 lowish green. 



Sept. 8. Dead. 



Sept. 10. Harvested 55 hills. 



Oct. 7. Harvested 55 bills. 



Aug. 26. Some blight. 



Sept. 1. Leaves three-fourths dead. 

 Stems dying. 



Sept. 8. Dead. 



Sept. 10. Harvested 55 hills. 



Oct. 7. Harvested 55 hills. 



YIELDS OF THE DIFFERENT VARIETIES FROM UNSPRAYED AND 



SPRAYED PLOTS. 



The stand was poor and very uneven, as pointed out on page 

 141. For this reason the yield from a given area could not be 

 taken as the measure and it was necessary to take the yield from 

 a definite number of hills. This is obviously unfair, since with 

 only half a stand, other things being equal, the yield should be 

 more than half as much as would be obtained with a perfect 

 stand. But as the best stand was onlv two-thirds of a full num- 

 ber of plants, this can be accepted as a more or less accurate 

 measure of the comparative yields. At the distance apart the 

 potatoes were planted there would be about 16,500 hills to the 

 acre, and 55 hills would represent about 1-300 of an acre and this 

 number of hills was therefore taken as the unit for comparison. 



In order to compare the early and late digging upon the 

 amount of rot, 55 hills of all varieties that were ripe or nearly 

 ripe enough for digging, were harvested on September 8. A 

 month later (October 7) 55 hills of all the varieties were har- 

 vested. The yields at time of digging are given in the table 

 which follows. The Rose was made up of two varieties, one 

 early and one late, and is omitted. The Queen is also omitted 

 because of its poor stand (i per cent). 



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