FIELD CROPS. 143 



After the beans were reniovtMl the plats were planted with sweet potatoes al)ont 

 the middle of Jnly. The yields on the different i)lats rantred from 140 to 1(14 hn. 

 per aere. 



The use of eotton-seed meal and avid phosphate for suirar eane .<rave yields vary- 

 ing from 22,140 lbs. to 24,711 lbs. of cane per acre, as compared with yields of 7,205 

 lbs. and 9,324 lbs. with no fertilizer. 



Drought seriously interfered with corn experiments, but the results of a variety 

 test show that under the conditions Mosby Prolific and Tatum Choice yielded the 

 most grain. Mosby Prolific also headed the list in the production of stalks. 



Fertilizer tests with cotton included 30 plats. The largest yield of seed cotton, 

 l,3(iO lbs. per acre, was obtained from an application of 300 lbs. per acre of each 

 cotton-seed meal and acid i)hosphate. Among 14 varieties King Improved gave the 

 highest yield, l,b59 lbs. of seed cotton per acre. This variety was followed by 

 Peterkin wifh 950 lbs. 



Culture tests with cluifas, sweet potatoes, Sjianish j)eanuts, sorghum, cowpeas, 

 fall potatoes, and se\-eral orchard and garden crops are briefly noted. 



General fertilizer experiments, (t. C. Watson {Pennsylraniu Sta. Rpt. IHO,:;, pp. 

 191-267, pJ>i. 7. <1(/ti>. 1). — The results obtained from experiments with commercial 

 fertilizers and barnyard manure, extending through a ])eriod of 2) years, are 

 re])orted at some length. The experiments were designed to test the comparative 

 effects of single fertilizer elements, complete and incomplete applications, and dif- 

 ferent forms and different (juantities of nitrogen; to compare conunercial fertilizers 

 with barnyard manure, and lime and plaster with conunercial fertilizers and barn- 

 yard manure; and to note the influence of lime, ground limestone, and plaster. 

 The commercial fertilizers supplying the essential elements of plant food w ere dried 

 blood, nijtrate of soda, sulphate of ammonia, dissolved boneblack, and muriate of 

 potash. The quantity of phosphoric acid and potash applied per acre every 2 years 

 was in general 48 and 100 lbs., resjaectively, while the nitrogen was given in most 

 instances in quantities of 24, 48, and 72 lbs. Barnyard manure was applied at the 

 rate of 12,000, 16,000, and 20,000 lbs. per acre. Corn, oats, wheat, and clover and 

 timothy were grown in rotation, and the fertilizers, save lime, which was applied 

 to corn only, were apjjlied to corn and wheat. 



CoDi. — In the test with the plant food elements used singly, phosphoric acid, 

 potash, and nitrogen ranked in the order mentioned in the iiroduction of grain, 

 while in the yield of stover potash stood first and })hosphoric acid second. Where 

 the 3 essential elements were given in combinations of 2, they ranked as follows: 

 Potash and phosphoric aci<l, phosphoric acid and nitrogen, and potash and nitrogen, 

 in the production of grain; and potash and phosphoric acid, potash and nitrogen, 

 and phosphoric acid and nitrogen in the production of stover. Different amounts 

 of dried blood in the complete application increased the yield of grain as the quan- 

 tity of nitrogen increased, while rations of nitrate of soda under the same condi- 

 ti(jns had the opposite effect. The intermediate quantity of nitrogen (48 lbs.) in 

 the form of sulphate of ammonia in the complete application gave the best results. 

 The largest yiehls of grain were obtained when the quantity of nitrogen in the com- 

 plete fertilizer varied inversely as its availability. The use of 12,000 lbs. of barnyard 

 manure per acre gave better yields of grain than the use of a larger application, 

 while a better yield of stover was secured from 20,000 lbs. than from a smaller 

 quantity. The total yieUls were greater with barnyard manure alone than when 

 the same was applied with lime, (iround limestone was moreeffective in increasing 

 the yield of grain than the same (|uantity of lime, and land plaster was more effective 

 in this respect than either lime or ground limestone. The application of 4,000 lbs. 

 of lime per acre reduced the total yield as compared with the use of no fertilizer. 



Odt.t. — Phosphoric acid, i)otash, and nitrogen used singly ranked in the order given 

 in the productit)n of grain and straw. The total yields on plats receiving nitrogen 



