SWEET POTATOES. tl 



.^■. -rio-q. ■ • . ci2..K^E;W-'^ER^EY, 1886. , ,.,,:.,,..., 



By P. A/A'^NOLD, viNELAND,''CyMBERLANp Co. FiftH Annual Report. 



''Plots 4, 8, 9 and 1 1 have given cash retui^ns) ranging from four 

 to eleven times as great as those from the unmanured plots; said plots 

 have also only one point in common, for six consecutive years each 

 fias received a heavy dressing annually of potash in a soluble form. 



"The conclusion is, therefore, positive, thdt for raising profitable 

 crops upon this farm witli.the present rotation potash is absolutely 

 indispensable. . , 



1888. 



r- r- ^" :;'-fv .■ : "•... 'H' ' -K, ' ■ v:' ■■ 



By G. H. Cooke, Director.^ .Budletin No. 54. 



•;s "A field experiment with/fertilizers was begun in 1882, by Mr. A. 

 P. Arnold, of Vineland, which shows very cleary two points in regard! 

 to potash: First, its directly favorable effect on sweet potatoes, as 

 indicated by the crop of 1883, and second, effect in improving the 

 CjTop-prOducing power of the soil as indicated by the second crop of 

 ^weet:potatoes in 1887.^^^ r: ^ 



•TV *^*At the close of the^rstuotation in xS8^, the following conclu- 

 sions in reference to potash were reached: 



; c "i. Potash used alone on plot 4 influenced the profits in a very 

 marked manner. The increased returns from its use were sufficient 

 to leave a balance of $21.59 after fertilizer charges had been met, and 

 due credit allowed for the produce from the unmanured ground. 

 $21.59 is 180 per cent, of $12, the cost of 600 ibs. of muriate of potash. 

 :. . "2. Plots 7 and 8, upon which potash was used in combination 

 with nitrogen and phosphoric acid, respectively, also gave profitable 

 crops, the net gains being $23.1 6 in one case and $24.48 in the other. 

 The combination of nitrogen, phosphoric acid and potash (plot 9) 

 called for the largest investment, but yielded the largest net profit, 

 viz., $47.03, or no per cent, of $42.80, the miarket value of 2600 lbs. of 

 a complete potato manure. > 



i^l^ "The sweet potato crop of 1887, compared with the similar crop 

 upon the same plots in 1883, shows the gain or loss of fertility of the 

 plots due to a continued use of manure and fertilizers. : i; 



r- . I'Whejever potash was i*sed, the improvement in the value of the 

 crop varies from 8 per cent, to 107 per cent. In ail cases where 

 potash was excluded the decrease in: the value : of- the second potato 

 crop is serious, ranging from 36 to 63 per cent. 



