xt7wwp9t3765 https://exploreuk.uky.edu/dips/xt7wwp9t3765/data/mets.xml   Kentucky Agricultural Experiment Station. 1921 journals kaes_circulars_001_1_097 English Lexington : The Service, 1913-1958. Contact the Special Collections Research Center for information regarding rights and use of this collection. Kentucky Agricultural Experiment Station Circular (Kentucky Agricultural Experiment Station) n. 097 text Circular (Kentucky Agricultural Experiment Station) n. 097 1921 2014 true xt7wwp9t3765 section xt7wwp9t3765 , ll //
/ / §
COLLEGE OF AGRICULTURE
Extension Division
THOMAS P. COOPER, Dean and Director
CIRCULAR NO. 97
PHOSPHATES FOR KENTUCKY SOILS
BY
R. E. STEPHENSON
FEBRUARY, 1921
Lcxington, Ky.
}’¤a1~lisI1··l in t··»r1m·¤-1i·»11 with ilu- :t:1·i<·ultut‘;11 t·x1¤·nsi»»n work t·z11‘1‘it~·1
111 1•)‘ <··¤-·>p··t·;t1i¤»n ··t` tli·· t'·»lI¢·;·· ¤·1` ,\;1·ii·uitu1·»~_ [`Ili\'t‘l`Si[}' of Kotlltlvk}'.
with thv I`. S. i‘(‘|>1ll`iIllt‘ill ini` .\::t·i¤·11lt11r¤·_ uml iiistriivtitotl in i`u1‘tl101‘:tnC0
01`thc wml; piwixitlt-tl my in tltr .\t·t wi` t’u1i;i1·ss ut` May S, 1t•1i,

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CIRCULAR NO. 97
PHOSPHATES FOR KENTUCKY SOILS
By R. E. STEPHENSON
1\1`11·1· lllll a1111li1·111i1111 11l` li1111·. 1l11· f1·1·1iliz1·1· 11111s1 11001l1·1l 1111
l{1‘Illlll‘l(}' s11ils 11111si1l1· 1l11· lil111·;z1·ass S(‘l'll<)ll is S()lll(‘ f<7I`lU of
Illlllillllilh`. 'l`lH‘ (‘UHllI]Ull s11Ill'1'(‘S (Il. l|ll(INlPll(|]`ll$ ill`? 2l('l(l l)ll()S‘
llllilill. l111si1· slag: l111111· 1111·;1l iillll g·1·1111111l I`|ll‘l{ ]1l11,s11l11111·.
'l`l11~ 11111·s1i1»11 ll2|llll`2lll}' ill'l$<‘$. \\'lll1*ll 1.1}].111 is 1l11· lllllsl 1l12si1‘-
L1l1l1‘ 111 11s1·. Ni111·1· 1·111·l; llllll>]lllill•‘ is l1y fill' lllll 1·l11·a111=st s11111‘cc
lll [lll11>[¤ll¤>l'\l$   1‘ll.¢‘1‘ll\`l‘ll\'S> llzls lN‘<’ll l(`$l¥`(l lll<‘1>ll1]lilI'lSUll \\'lll1
111·i1l 11l111s]1l11111· wl1i1·l1 is lll\* 11111s1 1·1_11111111111ly llS<‘ll 111' any pl111s-
11l11111· l'1·1·1iliz1·1*.
.\1·i1l Illl|Y>l*llEll(’ is 111111l1· l1_x· 11·1·a1i11g; il {[l\'(‘ll \\`(°l;Illt 11i` 1·111·k
Illlllillllillll wi1l1 illl 1‘<|\lill \\`t‘l{Illl 111` s11ll`111·i1· 111·i1l 111 ('ll2ll1§L‘ 1l1c
11l111s11l1z111- 111` lllll l'1)(‘l{ i11111 il 111111·1· S11llll1l1* l)1>l']l1 11f l1igl11·1· avail-
:1l1ili1y 111 1·1·1111s. .\ 11111 11l` raw ;:1·1111111l 11l111s11l11111~ 1·111·l; 111` 1l11—
gllillllx ;;1·111·1·all_x· ll$(`(l 1l11*1·1·l`111·1* 1·1111111i11s l\\'lL'<‘ as 111111,·l1 pl111s-
]>ll¤7l`llN 1l2 111 I4 111·1· 1‘<‘lll1 (rl. 1l11· 1~l1·1111·1111 as il 11111 11f Slilll(l2ll`(l
211·i1l 11l111spl11111·. 'l`l11· ]1l111s]1l1111·11s 11l` 1l11~ 1·111·l< will Q`l`il(l\l2lll}` l11*—
|'|>llll* il\'2lll&ll*l<‘. 1l11~ (}lll}v 11111~s1i1111 lwizig \\`ll<‘llIt‘1` i1 will a1·1 rap-
11lly 1·111111ul1 111 giw 111·11li111l1l1· l'(‘llll`l1S.
'l`ll(‘ l`11ll11wi11g 1z1l1l1·s gin- 1l11~ lIll'l'\‘£\S1‘$ 11l` 1l11· 1li1l'1·1·1·111
1‘l'<’]>< i11 llllk l'Ul&lll1>ll l(*1>l'lI-N1i_\`lN‘ilIl$~\\`ll<‘ill-(‘l|I\'(‘l'\l 1111 six
Kl`lllll<‘l(}' s11il (‘XI)l‘I'llll<‘lIl i11·l1ls. 1·1—]11·1*s1—111i11g;· six 1li1l'1·1·1·111
TXPGS of s11il. 1\1·i1l [)ll1·l< ]7ll<\$[1ll&ll1‘ 1000 ll>s.. 2lll(l 111111-s111111¤ 2 11111s p1—1· 111*11* p1·1· 111121-
1i1111. l11 ('Ulllllllllllf 1l11* 1‘1*1111·11s_ l'(ll`ll was vz1l111*1l all $1.00 por
1

 -1 C1·I'(’1l]1II` N11. 97
b11sl11~1. 11*111-:11 :11 $1.50 1101* 11llN111‘1, :11111 11:11* 1.l'0lll s111*l10:111$ 1111.1 11,C
01111*01* $1.00 1101* 11111111I`L‘(1. ,111111 :11-111 1)1l1)N1)11l111‘ w:1s 1*:1111011 111 11111
$25.00 111*1* 11111, 111* $10,00 1101* i11‘l'1‘ 1·11l' 1111- 800 111s.: 1110 1*11111
. 11h11s11h:110 :11 $12.50 111‘1‘ 11111, 111* $10.01) 1)1‘1' il1‘l'1‘ 1`111· 1111* 1111111 M
. lbs., :11111 1110 1i1110s111110 :11 $2.50 1101* 11111, 111* $5.00 1)1‘I‘ :11·1·1· 1111 1
1110 111*11 11111s 1101* 1*0t:11i011. |:;\_I
'1`110 1111:11 \`il111C 111 1110 1·1*1111 11ll‘1`1‘i1S1‘$ is {f1\`1’1l, 11*i111 1111` 11·»*
4 1 1`L*1l11`I1S :11111 1101* 00111 11l'1>111. .1.111` 0:1011 111 1111- 1>111lS1)111111‘> 11*1.11 :11·»z.··
1 :11111 11*i111 1i1110s111110. 11 11111s1 111* 1`1‘ll11‘1I1111‘I'l‘11 111:11 1101 1*1~1111·11~
:11111 1101* 00111 111*11111 :11*0 1)11$1`l1. 11111111 1110 :111111*0 l)1'1\°l`$ (I1. 1-1-1111.
1 :11111 101*1i1iz01·s, :11111 will 1*:11*1*. 111: 1‘1ll1l'S1‘, \\'1111 \`i11'}'111Q 111-1 1-.· 1_ ..
N0 011:11*g0 is 111:1110 1111* 1110 1:111111* 111 111\`11° :111111i1·:11i1111, 11111 11··i11.»·:·
1 is :1111* 1*:11110 gi1*011 1110 1'1\1'll s1111*1·1· :11111 11*110:11 s11*:111* 111*111111 ···»~ 1.
T110 11110 $111111111 :11111111 1111.51*1 1110 1111l1‘l`. 111111* 1'1I1l11l111'1\\¤11\ 1t*··
111:1110 1111 40 0111*11 01*1111s, 311 S1)}`11<‘1l11 1·1*1111s. 2T 11*110:11 1·1·1111~. 11;,1
21 01111*01* 01*1111s 111:11 11:11*0 110011 1l1`1>l1\1<‘1‘l1 11\lI`11I1_L' 1111* 21 111 > 1··11:·~
i11 11*111011 1110 1i0111s 11:11*0 1101*11 1l1l111‘l' 0x1101*i1110111. **
'1‘h0 soils 111 1110 001111*:11 B1110;:1*:1ss 1`l‘1f1¤¤1l :11*0 11111 1'1|'11 E:. (11*
11110s1111111*11s 101* 111111s11h:110 1I`Q2l11111‘ll1S 111 S11(l\\' l`1‘$1l11\; 1*4111**-
- (1l1Cl111}’ 11:11:1 f1`1)l11 1110 L<‘X11lg‘1U1l s11i1 L‘X1>1‘l'1Il11‘1l1 110111 :11*0 11C L1,
111*0s0111011. O111}` 01*1111 i1101*0:1s0s :11*0 g`1\`1‘11 111 1110 s1111111111:j.*
1:111105, but 1110 }`11`5111S 0f 1110 011001; 1111115 :11*0 gi1*1·11 i11 1110 1.1~t
1:11110 10 which 11113 i1101*0:1s0s 111:11* 110 :11111011 111 11111:1111 1111:11 y11`11i‘. M
\Y11Cll 1101 1*01111*11s :11*0 01111si1101*011 1\'il111C 1111 i1101*1·:1~1·  
— 00st 0f f01*1i1iz01*s) 1110 1*11011 111111s1111:110 11:1s 1I1\'1‘1l $21.01 111‘1`111‘I'*‘ RU
1 1101* }`Ci11' 01111111:11*011 wi111 $1.111 1:11l‘ :11.-111 1>1111S111lil1<’. :11*1-1*:101110 1.2
fi0111s :11111 :111 }'1‘k1l‘S. (111 1110 s:11110 11:1sis 111111* :11111 l`1P1'1{ 1111·~— BC
1111:110 11:11*0 gi1*011 $5.06 01111111:11*011 11*1111 $11.12 1.1>1' 11Il11‘ :11111 :1~·E1
111111s1111:110 1101* :101*0 1101* 1*0:11*. N1‘111lL‘1` 2l(‘111 11h11s11h:111· ll111` 1·~·Z1
p110s11h:110 il1()11C g*:11*0 s111`1i0i011t. 11l1‘I‘1‘&1S1‘ 111 11:11* its 1·11~1   FH
i 1.110 L0110 0:11; 110111, :11111 :10111 111111s1111:110 1:1i1011 111 11:11* 1`111`  
00s1 011 1110 M:1y1i0111 110111. L0:11*i11g 1h0s0 111*11 i`i0l11s 11111. 1i»· ,1,
showing is m11011 1)C1tC1‘ 1111* 1110 011101* 1i0111s, :1s 111:11* 1.)1‘ 1111s01·1*1·1
from thc t£l1)1,€ 1101011*. \V11C1`C\`CI` 111110 was 115011 with 1110 111111** `
ph:1t0s 11101*0 was :1 p1*0‘111:1.b10 1`011l1'11, tho 01.1 1110 F:11*is11111 111111

 I'hox lhulws or lx'¢·ul1u·/ra Soils 5
I J
as uml thc returns wvrc gl'(‘2ll(‘l‘ l.l'Ulll rock plmsplizntc when lime was
INI III ]l(It. 11SC(l.
I` l`*II‘Ii The fnllliwirng iublcs giving yiclcls on the various soil cx-
` lI—I'III I.I·I·ihiI·ut livllls Im: in<·lI1lll ull lI'i1·lj I · 3 ;] I`y‘I4
» A I . IE   2. z _ : '
L LE I·* E I: E i ‘: 1.611
E   :   . I · . . # > ¤ 2 .: 11..1
— » Iw M E Z m 1 3 z ;. T
'E ` F I-? E U > $2 1 : i I{ll<
·¤ 5   "‘ F .2 *·· ; ·· `6 5 i- I,_.
I L: I u 1m 5 ;. L: Z :2 "I
 i 7   I I · I`.1l`1
I Greenville     l{l‘*I 11.2 1516 5.2 1171 $51.66 SI16.66 ;;·:I
I AP 16.7 1626 7.7 1676 67.:12 52.::2 :;;~ 1 ~II‘•‘
I I _ I _ I _ I I
Lone Oak ...... . ........ RP ..1 .21-1 5.-1 11Nl 217.65 22 65 ITI1~
` AP 1.21 1157 6.5 lS25 :1s.S7 2Z1.§7 12II 1
l I ` I I IIIII
Mnytlelal ...................... RP 11.6 1661 6.6 2652 62.76 17.76 21l*Q `II"
I AP 12.6 786 7.5 2S216 56.56 1-1.56 2;··ri ;II·I.
I I I I I I I . lla.!
Russellville ................ RP 6.6 6215 1.:< 1611:1 :16.16 2»1.l¤ 16;; .
I AP $.8 712 7.5 2672 1516 :1:1.16 fjl `"U
I I  
I I _I _ _ I I __
Berea .......................... RP 11.6 11.1 5.s 16:16 ....21-1 12.21-1 2~2“
I AP ` 12.8 1568 6.6 216:1 6:1.61 ·1$.III :I2»·T
I I I I I I  
‘ Fzlrismn ............ . ....... RP 121.1 1626 2.6 721 Z13.121 26.131 111.11 I·I1I
I ` AP_ 28.7 1651 7.7 16S2 76.61 61.61 1.1IIT ;g..j
_—_v y-   + IW"` K my H W   IIILI
Average _.....   ........ RP 11.2 1686   1761 17.216 212.216 EIN I
xZ¢1’
I AP I 121.6I 12721 7.6 21121 56.16 11.16 21··12 ‘*
* .\I‘;r.\¤·Is1·I1:11¤·. I`1';1
Minus Sllill <—1 lI1•‘2lll$ 1I1·l'l'<·21S¤‘<1 yi`-III or loss. _..
\'1I\
l'1*»
EIIII
¥·‘I

 l'lm.wp/mlrx for /\'¢n/u¢·/ry Soils 7
Yields on Check Plots of All Fields.
I   I I 2 I z· I ¤
· :   77 : *·: I E
=¤ 2 5 J ‘ ” I >
· ~ EZ 4-: I {Q wi I uz
F I s >: 2 ‘ > ¤ ~ ¤~
E :· z-: :*‘ I .2 A I E
~ I L1 1 J; : I 5 I 0 CJ
W I _ _ I I I I
llm·11v11le . . .i<».:. 1x-in 7.4. 679 $66.79
__ l.Ia1e()ak.. .. . . .. 34.8 2574i lll,3 1772i 93.71
EE Nlzlyllelml   . .. .   . . {Z5.?} 2;!•iEl 7.fl 368 64.02
" E llussellville .. .. 34.5 2t••i4 12.0 1707 90.21
EZ` llere:1 . .. .. .. 26.4 2384 5.2 116 61.20
_ — l`.n*istun .     . .... . 13.3 1174 3.3 137 31.36
jlnil i _ __ _" x R F _
M4" .\vera;:e   . . ...... .. ..   2t.:»:» {IMM t.I lll? $67.88
lil" l·`1·<»n1 the talnles almve it may l»e lll>S(‘I'\'l‘l`lll}` nl. nnte tllat ll<‘lllll‘1` aeitl llllllS1>llill(’ nor rock plmspliate
1•`lf . . . .
_mI1_, `lIII“4* illly l"’ll\llll`l'Zll)l\' l`ll('l'l llll llllllllll°ll Slfll lll] lll\* l4(Ill(‘ llilk
Heltl.
  \\ lien linnestnne is nsell with tlte plnlspliate treatnients. the
ii I iesnlts are l`t*\`t‘l'St‘nt their
elleet is not elnnpletely t‘XllilllSll‘ll in that time. \\vll0l1 crop
l't‘¤ltlll('S I_Sll`2l\\', stalks. ele.I or lllillllll'0 are 1`(‘llll'll(‘(l. quite an
iIl*]ll'l‘ei;ll>le p¤n·ti<»n nl` the pl1<»splnn‘ns nseil in llie gl‘<>\\’i1lg e1‘0pS
Qels liaelc in the soil.
a

 ‘
L
S Circular No. I)?
Calculation of the phosphorus required for average yields . rea~
produced shows that about. two-thirds of the phosphorus appli.·`[ solll
y in acid phosphate is used each rotation by the crops gi·o—.xit_
This gives in round mnnbers lit) pounds ol` phosphorus in cx.
cess of the retptirement. lf the application were halved there
` would still be enough phosphorus to supply tln·ce-fourths of
the total requirements, and more than enough to supply the fu"
I actual crop increase. lf then three-fourths of the pliosphorut mi
A ` used by the crops produced is turned back to the soil tin the wu
form of manure and residues) phosphorus is being supplied ax
rates approximately 1 1/3 times as fast. as used, a reserve is Nw
i being stored up in the soil, and the soil should get better each yp.
rotation. thi
\ In the ease of rock phosphate, four titties as much ph··~- llai
phorus is actually applied to the soil, in 1600 lhs. ot` 1·aw i··»·:l;. will
as in 800 lbs. of acid phosphate; an excess of approximately l~T» illot
pounds of phosphorus is applied each rotation, or more than
six times the actual crop demands. lf the application wcr·· mv
y halved there would still be 1l10l't‘ than three times the 1·o·.a:iu:i `
demands. Add to this the phosphorus turned back to the soil my
in manure (approximately three—fourths of the amount ll:~;»l
by the crops) and it is easy to see that the soil is rapidly huilil- We
ing up in phosphorus co11te11t. Applications at this smalcr tht
rate should double the phosphorus content of the soil in lt) ri 'l`o·`
15 years. \Vhen only residues instead of manure are returnctl, l»··r;
phosphorus does not accumulate in the soil as rapidly liecau~·.·
· from half to three-fourths of the phosphorus used by crops i~ prn-
i removed in the grain. crm
Tlie large amount of phosphorus obtained in the r·»t·E; lire
phosphate is the strong argument. for its use. `liveryone is well lla
aware of the fertility of the soils of the central Bluegrass sec. Let
tion. That the chief reason for their superior fertility lies in llo
` their high phosphorus content is likewise fully understood, liu: Wa
the phosphorus in these soils is mostly in exactly the same cliciir
ical combination as that in the ground raw rock used in tltc
field tests above. Rock phosphate therefore is quite ettectiw
· where it is a natural constituent of the soil and there is no

  `
1'}z0sphaf{·s for Ii'e1z/ue/ry Soils 9
ields reason why it should not he etleetive where rightly used   a
plied souree of phosphorus on poor soils.
own.
l VY WHERE THE RESULTS ARE APPLICABLE
  The results ohtained on the Berea field will apply to the
_ lh, knoll regions of Bath, Bullitt, listvill, l"l('llllllg, (jarrard, Jef-
mm fc;-son, Lewis, Madison, Marion, I\elson, Oldham and Powell
I mv counties.
_·,{ iu Those of the Russellville field will apply to the limestone
ye is region ot` southwestern l{entu<·ky, whieh ineludes parts of Adair,
eaeh .\llen. llarreu. llreekenridgge, Bullitt. Caldwell, Casey, Christian,
t`linton, (`rittendeu, ('lllIll)(‘1'lilIltl, lidnionson, Grayson, Green,
plat,. llartlin, llart. Larue, liiyingxston, Logan, Lyon, Meade, Met-
rot·l;_ t·all`e, Monroe. l’ulaski, l(o<·k<·astl<·, Russell, Simpson, Taylor,
v l—3 lllodtl. Trigg, \Yarren aud \\'ayue counties.
{lm Those of the Mayfield aud Lone Oak tields will apply to
liv') the soils of Ballard, Calloway, Carlisle, 1·`ulton, Graves, lliek-
  man. Marshall aud Me(`raeken counties,
gmt The results froiu the (lreenyille field will apply to the
tuiltl- \\'estern (`oal l·`ield whieh iueludes parts of Butler, Caldwell.
nalier t`ln·istiau. Daviess, ]‘:(lIllOllS(}ll, Grayson, Haneoek, Henderson,
lt) in Todd aud Cniou eounties aud all of Hopkins, McLean, Muhlen-
trnetl. lrerg. Ohio and \Yebster eounties.
·eause 'l`h.»se from the l·`ariston tield will apply to the western
ips is part of the l·]astern (`oal l·`ield aud the worn lands of tl1e
eastern half of the liastern Coal Field in the counties of Bell,
roek llreatliitt, Boyd, Carter, Clay, Elliott, Floyd, Greenup,
s well llarlan, Jackson, Johnson, Knotts, Knox, Laurel, Lawrence,
ts see- Lee, Leslie, Leteher, MeCreary, Magotlin, Martin, Menifee,
ies in llorgan. Owsley, Perry, Pike, Pulaski, Roekeastle, Rowan,
l-hi: Wayne, Wliitley and \V0lfe.
elieni-
in the
'Ct'll\'l`
is iw
t

 5
I
ll) (.lz`ra·aaIaar Na}. .'/7
DIRECTIONS FOR THE USE OF PHOSPHATES Tim,.
Acid Phosphate lalirar
~ In fi`tI`llI praietis prailiaalily the inaist ea·a>1ia»1nia·ail waay tai aa`,. _ _‘
au·id pliospliaate is tn drill Illlll to »Ill(l pamnals per aaa·ra· aa-}a.._j lllllm
1 wheat or other sniaall graiin is sown. 'l`his will he snt`tia·ia·m alaa- llllilw
the wheaat amd for the a·la»va·r air graass eraap whia·h nsnaally   IW`
a lows wheait. lf this praietis is t`a»lla»wa·al ra~;:nlaarly with a·,a»»§_ llwl
a rotaatiani amd maamare is used am the lamd am whia·h ta»l»aaa·a·ai   lmll
»· eurn is graiwn faillaawing the elanver amd grass, it will nait lie 11···. i
essairy tai use aadalitiamaal pliaispliaate. [tl'lI\'l(ll‘ll the mamm·a· I;. ll`t"l·
. been eairefully saiveal. amd ais 11ma·h aas six tai eight taaais Iaer aa~·y·.· tlie r
hats been used. Fllll
I
\ If it is desired to use aaeid plianspliaata- in a·a»n1aa·a·ti·»ia alfa] mh.
]l1illllI1'L‘ fur corn, ta>liau·a·a»_ air other a·1·a>ps_ it uaaay l»a· aapyll-i   _
when the niamure is lieing slareaad. \\vIll‘ll laaaiding the sl»ra·aa·E· 
plaiee at laayer of IlliIllIlI'l‘ amd sprinkle a>va·r it nnil`a»rnily ~·»zi_·· mw
aieid pliespliaite. Two laayers of niamnre amd pliaasiiliaate sliamall lilllll
give am eve11sp1·ea1al of the plinslaliaite aan the lamal. 'l`h•· illll·ti}I,i —   hl
of pliawspliaite fair eaieh loud a»i` 1llillII'll't‘ is aleta~r1nina·al hy aliviilfng `ll_U_I
the aipplieaatiam of plmspliaite desired per aiere lay the muiil~··;· ?,`lj1
0f l0a1ds 01 niamure used per aaere.  
I·`a»1· inter-tilled eravps. sneh ais a·a»rn. ta»liaaa·a·a» amal l»1·aa~.~ ghjg
plamted in raaws, it is liest tan amply the aaeid plaaaspliaate l»i··»aa»E- 1.,wjl
eaist, nr drill it with the fertilizer a1tia1a·lm1ent a»t' aa graain ·l:£]
\\'itl1<>u1a alaauht. it is niaire eti`ea·tive aipplieal this waay aliaaai  
` the row, fair the feealin;3 raiaits laaave at l»a·tta·r l7lIII\¤I`Illllil".`i
I eanne in azaantaaet with the pliaaspliaate tlirnaaut the growing sa·a1~·»t¤a pim
B1‘<1a1dea1st aipplieaatiams shaiulal l»e niaaale am the l¤ra»laa·n g·a·»»aa:.E aime
so that it Illilf he tlianrnly 11 a»t` ais nmeli a¤~ •Q`·‘* amy
_ pounds or inaare per aaa·ra~ is used. tai laist t`<»r aa pa·ri¤»al all ilr··‘ a;a._·]l
01· four years or ]I1()l‘(‘, the plinspliaitv many he aapplia-al l»r·»aaet`a»re lara-aalaing.
Only with very s1na1ll annrinnts of aaeial pliamspliaile. my llll Us I]
pounds per 2lC1‘C or less, would we reeniiiinenal drilling: in tlar will

  K
I']l(}S])]l(l[I'S for ]\'ei1I11<·}ry Sails 11
mv. But we do not believe it advisable to use s11cl1 small ap-
plieatioiis.
Experiments on some of the Kentucky experiment fields
l;\_,l,l,i, gmlieate that it linahes very little dittercnee in yields whether
_ ]m·gt» ainounts of acid phosphate are applied at once for a rota-
ii ini- tion, o1· the same amount is divided into annual applications for
A Ni the same pe1·iod of time. Very little phosphate is lost by
_,_i,`w_i leaeliiiig.
U   When acid phosphate is to be used on land where lime is .
_,_ M tml, the lime should either he applied first and worked into
,_ M_ the soil, or the lime and acid phosphate may be applied to-
gether, provided they are worked into the soil before it rains.
__ These dircetiotns will apply to the use of bone meal and
  basic slag.
,,_,,,,' r V_ Where lime is badly needed and is difficult to obtain be-
, in cause of long haul or other reasons, it is suggested that 250
>,in,l,`,., pounds of acid phosphate be 111ixed with 500 to 750 pounds
  of tincly ground limestone, and that as large an application of
  the mixture as can be run thru the fertilizer 2lll2lCll1ll0llb of the
  grain drill be applied when wheat or other small grain is sown.
umm. The inaterials should be applied as S0Oll· as mired, preferably
the day they are mixed. Experimental results indicate that
l»t·ar.~ this treatment will greatly aid in getting a crop of clover fol-
l»i·~;t·i- lowiiig the grain.
i drill
han Et. Rock Phosphate
'll?·` if Rock phosphate should not be used in small annual ap-
"`~"‘"‘· plications. One thousand to 1500 pounds per acre, sufficient for
¥`*'*'lll·l three to tive years, should be applied broadcast on the un-
l`•`I’¤*l`¥*‘ lirolien ground and should be disked in before breilklllg. It
ie hill may be applied with a lime spreader, thru the fertilizer at-
l` th:   taielnnent. of a grain drill, or when manure is being spread, in
otitlinet the manner already indicated for acid phosphate.
lg' A good way to use rock phosphate is to apply it in the stalls
my Wl HS the manure aeeuinulates, using 2 or 3 pounds per day for an
lll ml] lllllllltll weigliing 1000 pounds, A pint of rock pllospltilte \\'Clgl1S
1

 <
, me {>
12 ('l'}'<‘1l[lII‘ N0. 5/7
about lil poumls. lt, is ll<>ul>tl`ul il` mixing: with lll2llllll‘e wie
mziteriully to the awziilziliilily of llie plmspliiiie over wlizii ii
p would be were the plmspliaiie uml iiizmiire zipplieml S<*|>1l]‘;{l.·l:;_
liut it is ll saving: of time to zipply iliem l¤»g¢·tI1e1·.
_ C0llll`2l1'}' to ll1lll‘ll llml liens lieeu ivrilteii mn the sul»_j.·.»i_ jp
has been fouml on the l{L‘lllll('l{}' experiment fielils them 1···i·l{
plmspliute gives good results mi tliiii l;iml tlie first yezir l···I`»·i·~
p zmimzil mauiiire or green mamiire emps lmve been us···l_ ng
. COllI'S(‘,Il1\lCll lairger yiellls will lie ll<)Sl>ll<)I`llS tliait is stlwell in tl1·· \.Q5
by its use is ill] llllp0l'ti\lll ('()llSl(lCl'&lllUll.
O
4