EXPERIMENTAL WORK WITH RAW ROCK PHOSPHATH. - 37 
At the beginning of these experiments limestone was applied on the 
plots indicated at the rate of 5 tons per acre at Ewing and 6 tons 
per -acre at Raleigh; no further applications were made during the 
first five years of the experiment. Rock phosphate (finely ground) 
was applied at the rate of from 500 to 2,000 pounds per acre on the 
 ‘Mdifferent series and kainit at rates varying from 200 to 800 pounds per 
acre, with subsequent applications every four years. It is not stated, 
however, which plots received the maximum and which the minimum 
amounts of these materials. 
The average yield of each crop during the five years of the experi- 
ment is given below in Tables XIII and XIV. 
Taste XIII.—Average results of five years’ work on four series of plots at 
Ewing, Franklin County—Four-year rotation, consisting of wheat, cowpeas (or 
other legume), oats, and corn. 
Average yield per acre. 
Treatment. 
Wheat, | Cowpeas,| Clover, Soy Oats Corn 
5 years. | 3 years 1 year beans, BS years. | 5 ‘ 
y : y : year. 1 year y years 
Bushels. Tons. Ton. Ton. | Bushels. | Bushels. 
INGUGEe Boe tones tee 5 FET eo 5.1 0. 63 0. 20 0. 27 14.3 16.4 
NIGIDUDIRS + 5 Coes ae Se oe eee 6.7 -o2 24 -23 19.8 23.3 
iMamune times. bi Sis ser sets 12.0' - 88 -40 -47 23.0 28.9 
Manure, lime, phosphate rock.....---...-- 13.7 98 -81 53 25.0 30.3 
Bushels 
IN@i ed: Seas dada s ek sess tc tee es 4.3 11.46 .19 2.0 14.6 18.0 
Bushels. | Bushels. 
IR GSIOIDIGRD oS Re 8 oe ee eee eae 4.1 1.2 . 00 2.3 16.4 18.7 
Residues time}: 2524 Fh ce sas Ek ees 12.4 2.4 . 50 4.0 25.4 29.7 
Residues, lime, phosphate rock.-....------- 14.0 3.2 1.08 4.0 24.0 28.4 
Residues, lime, phosphate rock, potash... 20.7 4.0 75 4.2 27.2 31.7 
Ton. 
IN@ITG Bs BSE eR tara a ee eerie see 5.7 1.3 0.31 2.0 16.9 20.0 
4 1 One year only. 
TaBLE XIV.—Average results of five years’ work on four series of plots at 
Raleigh, Saline County—Four-year rotation, consisting of wheat, cowpeas (or 
other legume), oats, and corn, 
Average yield per acre. 
Treatment. 
Wheat, | Cowpeas,| Clover, oe Oats, Corn, 
5 years. | 2 years. | 2 years. ty ae 5 years. | 5 years. 
Bushels. Tons. Ton. | Ton. | Bushels. | Bushels. 
INGnetese) Saaaots de ceccececsece es ceedaccee- 8.6 P83 0. 33 0. 28 ates? We2 
CTT ESAS Sse Se SOIR eee ee ee ae 7.4 1.8 Bod) - 30 11.7 24.3 
Meminernimerecses = it Sa. PO oS cakes 16.5 4.2 . 67 . 26 19.9 34.9 
Manure, lime, phosphate rock............- 17.8 3.9 . 68 323 19.0 33.8 
Bushels. 
INIGINE: S03. aR eHoe eee eO ene Sees 6.9 ley f23 57 10.2 16.6 
L2GS US Ee Se a Eee eee ee 8.4 | Turned. | Turned. 2.5 12.8 21.1 
eestdites meme nic a eet eh colo c cee | 18.6 | Turned. | Turned 2.5 19.7 31.3 
Residues, lime; phosphate rock.......-.--.. | 20.7 | Turned. | Turned Dad 20.0 33.0 
Residues, lime, phosphate rock, potash..-. 21.9 | Turned. | Turned 1.8 21.1 34.3 
NIQHG E53 Ae fe et ee ee ee | 7.4 a beak (2) ot 1D. 16.4 
1 One year only. : 2No weight. 
