FIELD CROPS. 139 



" Phosphoric acid and lime seem to be most effective in increasing the yield. 

 . . . lu the combination of nitrogen and phosphoric acid, unlimed, phosphoric 

 acid gives a gain of 1,030 lbs. over nitrogen alone. With nitrogen and potash, 

 phosphoric acid, unlimed, gives an increase of 2,080 lbs. over nitrogen and 

 potash alone ; when lime is added to both of the above combinations the increase 

 due to pliosphoric acid is 1,000 lbs. 



" Lime shows a marked effect in every case, except . . . when phosphoric 

 acid and manure were used. Phosphoric acid used with and without lime gave 

 a difference in favor of lime of 380 11)S. per acre. Where lime was used with 

 nitrogen as against nitrogen alone the gain due lime was 1,920 lbs. The effect 

 of phosphoric acid is seen in the combination of nitrogen and phosphoric acid 

 as against this with lime. Here the lime made an increase of only 350 lbs. 

 per acre. Nitrogen and potash combined, with and without lime, gave an in- 

 crease of 1,720 lbs. due to lime. Where nitrogen and phosphoric acid were com- 

 bined as against nitrogen, phosphoric acid, and lime the latter combination gave 

 an increase of only 600 lbs. On the plat where all three elements were com- 

 bined with and without lime the lime made an increase in yield of 640 lbs. 



" Where manure was applied lime made a very small increase in yield of hay 

 per acre. In combination with 5 tons of manure lime made an increase of 

 140 lbs. per acre; with 10 tons of manure 280 lbs. increase was made. The 

 reason for lime failing to show much effect is probably due to the fact that 

 manure is often alkaline in reaction, thus supplanting the lime in sweetening 

 the soil, or, if the soil lacks sufficient lime as direct plant food for the alfalfa, 

 the soluble lime in the manure may take the place of the applied lime, thus 

 accounting for the poor showing of the commercial lime. 



" Inoculation gave an increase in the yield of hay of 1,360 lbs. over no treat- 

 ment." 



The results of cooperative experiments with farmers throughout the State 

 were similar to those secured in the station fields. 



Alfalfa, C. K. McClelland (Georgia Sta. Circ. 72 (1915), pp. 4, figs. 2). — 

 This gives methods of production for Georgia conditions on the basis of the 

 station's work. 



Bur clover, C. V. Pipkr and R. McKee (U. S. Dept. Agr., Farmers' Bui. 693 

 (1915), pp. 14, figs. 7). — This publication gives the cultural requirements of 

 the bur clovers, discusses the value of bur clover as a pasture crop, cover and 

 green manure crop, and hay crop and in rotations, and notes some seed char- 

 acteristics of several varieties. Analyses of the plant are given showing its 

 great similarity to alfalfa. 



Experiments with com, C. F. Noll (Pennsylvania Sta. Rpt. 1912, pp. 33- 

 48). — This reports yields in variety tests of corn for grain, stover, and silage 

 covering the period from 1908 to 1911. Results of storing seed corn in a warm 

 room or a cold shed showed an increased yield of 4.2 bu. per acre from the warm 

 storage seed, the average of two years. 



Seed corn condition in Pennsylvania, spring of 1912, F. D. Gakdner 

 (Pennsylvania Sta. Rpt. 1912, pp. 29-33). — This reports the results of germina- 

 tion tests of .seed corn of the 1911 crop requested by farmers from all sections 

 of the State. A general average showed a germination of only 80.5 per cent. Of 

 the 126 samples received, 30 tested from 95 to 100 per cent. 



The feeding' of cotton, II, H. C. White (Georgia Sta. Bui. II4 (1915), pp. 

 257-268). — This bulletin reports the continuation of work previously noted 

 (E. S. R., 31, p. 433), and consists chiefly of data showing for the crops of 1911 

 and 1912 the analysis of cotton at four stages of development, namely, to the 

 first form, the first bloom, the first open boll, and maturity. The cotton plants 

 18833°— No. 2—16 4 



