704 



Weights of potatoes affected irith lihok and soil rots, 

 FIRST EXPEKIMEXT. 



Plat. 



1 



2 



3 



4 



5 



6a 



66 



8<i 



9 j 



10 I 



11 I 



n 



13 : 

 14 



15 

 16 

 17 

 18 

 19 



Manures and fertilizers. 



Hen manure 



Xew Yr)rk manure* 



Xotliing 



Cow manure 



Pig manure 



Koyal bone (2 rows) 



Koyal bone (2 rows) 



Kothing 



Potato phosphate (2 rows) . 



Potato phosi)hato (2 rows). 



Sulphate of potash, bone- 

 black, nitrate of soda. 



Nothing 



Nitrate of sotla.boneblack. 



Nitrate of soda, 8ulpbat« 

 of pota.sb. 



Nothing 



Sulphate of potash, bone- 

 black. 



Nitrate of soda 



Nothing 



IJoiU'blaek 



Sulphate of potash 



Nothing 



Amount offer-' 

 tilizers per i 

 acre. 



Sound 

 firsts. 



Sound 

 seconds. 



Black rot. 



Soil rot 

 lirsts. 



Scil rot 

 seconds. 



120 bushels ... 

 10 tons 



10 tons 



15 tons , 



500 pound.'). . 

 l,UOOj).uniil.-« 



500 pounds 



1,000 pounds . 

 640 pounds. . . 



480 XM)un<ls... 

 320 ]H>unds... 



480 pounds 



160 pounds 



320 pounds 



ICO pounds 



Pounds. 

 3.5 

 11.5 

 10 



14.5 

 65 



50.5 

 41 

 25 

 43 



41.5 

 47 



6 

 22 



38 



30 

 47 



38 

 21 



m 



28 

 17 



Pom /I 



3. 



7 



11 



6 



16 



16 



111. 



32 



13 



13 



11 



10 

 13.5 



27 

 50 



32 

 31 

 18 

 35 

 31 



Total. 



Poundg. 



2.75 

 38 



9 

 16 

 70 

 17 

 11.5 



5 

 21.5 

 19.5 



9 



4 

 9.5 



4.5 

 1 



1.5 

 11 

 0.5 



261.25 



Pounds. 



97 

 122 



37 

 193 

 221 



37 



51 



70 



58 



59 

 158 



50 

 70 

 116.5 



41 

 105 



Pounds. 

 47 

 47 

 36 

 35 

 65 



3.S 

 58 

 35 

 16 

 52 



34 

 47 

 44 



36 

 58 



67 

 42 

 7."> 

 45 

 21 



1,741.5 



SFXOND EXPEUIMEXT. 



* This manure is made in tlie cities and is largely used by sweet potato growers. 



As rejjards black rot it \va.>< louiid that wliilc as a rule the most protl ac- 

 tive plat furnislicd the jiTcatest aiuoiiiit, there were sonic e.xeeptioiis. 

 The various kinds of fertilizers in jjeiieral materially increastHl the per- 

 centage of black rt»t, but this increase (-((uM ii<it be tlclinitcly attiibiited 

 to any one of the leatling fertilizing elements. As regartls .soil rot, the 

 indications were that the manures used favored the development of the 

 rot much more than the commercial fertilizers did. The greatest eHect 

 was produced by cow manure, the next by lien manure, and the thinl 

 by New York manure, "triowers have for some time considered kainit 

 as a partial preventive of the soil rot, and while this single experi- 

 ment is not suftieient to establish its etbeieiicy, it certainly suggests 

 that further tests of kainit should l>e made. Aiiotlier apparent fact 

 brought out by these tests is the need of organic matter in the soil for 

 the i^rofitable growth of sweet iiotatocs." 



