208 



GENERAL INDEX TO ROYAL AGRICULTURAL JOURNAL. 



WHEAT. 



.searches on vegetation, 97; origin of 

 tlie Kothamsted experiments, ih. ; selec- 

 tion and character of the trial field, 9:5, 

 97 ; Professor Magnus's analyses of soils, 

 9S ; chemical and iihy.»ical qualities not 

 yet accurately dct<rmined, ih. ; account 

 of field experiments, it'.); .see also aji- 

 pendix, 140-1(32 ; mode of ascertaining 

 the relative condition of exhaustion, 99 ; 

 inliuence of season, KM!; manures em- 

 ployed, ib.; moile of distribution, 101; 

 formation of trial jilots, (7). ; the fielil 

 results, amoinit and charai'ttr of the 

 )iro<luce oht;dned in dillerent seasons, 

 lO'ii; first season, 1843-4; ruinfnll and 

 t-emperature, ih.; the season adverse to 

 grass, but favourable to grain, 104; the 

 small yield of wheat on the trial jilots a 

 proof of low condition of lanil, /7). ; its 

 (leficieney in available nitrogen, lO."); 

 second .-reason, 1844; tiie weather and 

 crops, lO.i ; etifects of anunonia salts 

 ami influence of mineral manure, lOt! ; 

 third season, 184;"), weather and crops. 

 107 ; comjjamtive etl'ects of mineral 

 ami nitrogenous manures, 108; fourth 

 season, 184('>, wealiier and crojis, 109; 

 elfect of ammonia salts and superjilio.s- 

 phate, 110 ; fifth sea.son, 1847, weather 

 and crops. 111 ; defective action of am- 

 monia salts without minerals, ll'i; 

 .>*ixth .season, 1848, weather and crops, 

 112; action of nitrogenous manures, 

 IV.i: seventh 8ea.-ou, 1849, weather and 

 crops, ]i;>; tftect of high manuring, 

 115; eighth sea.son, 1850, 115; sum- 

 mary of results, lltj; table of cxixri- 

 mental results in the last twelve years, 

 Ui'l; jilan, description, and quantity of 

 nuinurc i)er acre pt r annum, 1 17 ; ninth 

 scai-on, 1851, 119; ti nth season, 1852, 

 121 ; eleventh season, 1853, 122 ; twelfth 

 .season, 1854, 124; thirteenth season, 

 1855, 125 ; qu;dity and condition of 

 crop, 12tj; foiuteenth .sta.son, 185G, il>.; 

 comparative results, tendency of ani- 

 moina salts and minerals to j)rodnce 

 grain rather than straw, 128; fifteenth 

 .stason, 1857, ih.; results, 129; limita- 

 tions to the productive qualities of am- 

 monia, loO ; feixtcentii .season, 1858, ib.: 

 ixsidts, i;il ; reduced application of 

 ))otass and soda, ib. ; seventeenth .season, 

 1859, lo2; eighteenth season, 18G0, ib.; 

 nineteenth season, 18(J1, 135 ; twentieth 

 season, 1802-3, 137 ; results fiom mixed 

 mhieral manure and ammonia salts, 

 139 ; influence of seasons on the action 

 of U rtili.sers, 140 ; ditlerent eflects on 

 land in high and low condition, 142; 

 tabk of average annu;>.l produce at dif- 



ferent periods, 143 ; general re.sults, 144 ; 

 maintenance of productiveness of un- 

 manured land, ih. Apjxndix : tabular 

 returns, 140; eff"ects of the unexhausted 

 resi<lue from previous manuring on suc- 

 ceeding crops, 449 ; produce and increase 

 <'f wheat tluring seven years" apjdicatiou 

 of ]jhi)sphatic and annnoniacal manures, 

 and fur twelve succeeding years without 

 manure, 450 ; purpose of the experi- 

 ments, 451 ; protluce and increase of 

 wheat, both in the year of application 

 j and during .seven succc-eding years, by 

 using ammonia salts alone for one year 

 1 after twelve crops without mamire, 452; 

 i results of twelve years with mixed 

 ' minend inanure after eight years of 

 I libeiid nitrogenous manuring, 454; re- 

 ' lation of available alkali to silica in the 

 .>i<iil, 455; Liebig's thtory questioned, 

 lb. ; resulls by mixe<l minerals each year 

 I after anunonia salts, compared with 

 mixcnl minends year after year, 450 ; 

 prfKluce 1mm ammonia .salts yearly with 

 mixed minerals as compari'd with that 

 from ammonia salts each yejir after 

 minerals, 458 ; Lieliig on the eft'i;cts of 

 accumulation, 459; his o])inion not 

 supi)oi-ted by analyses of .soils, i7*; per- 

 centage of nitrogen in surface .soils,/?).; 

 the innx'covered portion of nitrogen in 

 manure' api)litHl to wlieat, ib. ; elfect on 

 succeeding crops of unexhausted mineral 

 manures, 400; illustmtivi; diagrams. 

 op]i. 401 ; explanation, 401 ; jiroduce of 

 wlieat on plots dirt'ert-ntly dres^'d, 464 ; 

 average percentage of minend matter in 

 ditto, 4<'5 ; correction of Liebig's state- 

 ment as to amount of soluble pho.splioric 

 acid u.sed, n., ib. ; relation of annual pro- 

 duce and increase, and dili'erent eft'ects 

 of a given amount of anmionia according 

 to sujiply of available minerals in the 

 j soil, 400 ; effects of ammonia sjdts on 

 ] heavy loam, 407 ; jn-aetical cf>nclusions, 

 1 ib. ; tables of results over twelve years, 

 470 ; average annual jjroduce without 

 manure, 409 ; projwrtion of grain to 

 straw, ib. ; eftei-ts of pho.splioric acid, 

 472 ; proelucc liy lannyard manure, ib. ; 

 effects of accumulation on later crops, 

 i 473 ; Jiroduce by mineral manure alone, 

 ih. ; cause of defective ix'sults, 474 ; pro- 

 ' duct! by minerals and ammonia salts, 

 ' and proportion of increase, 475 ; yield of 

 corn and straw greater than from farm- 

 yard manure, 470 ; annual produce from 

 400 Ills, of ammonia salts per acre alone, 

 in altcrnaliou with mixed minerals, and 

 in combination with different kinds of 

 mineral manure, 477 ; results from 



