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Image 6 of Kentucky farm and home science, vol. 2 No. 4 fall 1956

Part of Kentucky Agricultural Experiment Station

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Variation in yield and quality A of [0133600 gPOWI1 011 different plots reveals J I t f S °l St t IIlpOI' EIHCB O O1 I`llC llI°€ _; Q By WILLIAM G. SURVANT *7 It is probable that deteriorated soil structure is lim- , •• _ iting the income received from many Kentucky farms. , cf), 5 V 7; Recent studies at the Kentucky Agricultural Experi- _ * ment Station have shown that yield and quality of '°‘*” Z if tl ° _ I tobacco are lowered when structure and related phys- 3 - ‘z>-. $_r · ag, -._; r ‘· \ _ Fw . . · . . . `. H V '`AA ' ” " `¤_ M ical properties of soil have deteriorated. These stuthes { .. *2 .a. Q7 , e Li . . . - , . ~ =>; ’ " I av ` ii—r . so · also reveal that intensive use of land for row crops * xy {JQ-..__§ ****2 w e t; P results in less favorable structural conditions in so1ls. a··_‘ g ¤· ~·~ On the Experiment Station Farm at Lexington, com- ’ ‘ ‘.`‘ j ` · __-_ __,_ ( parisons were made of yields and acre-value of to- M - { bacco grown on a soil when structure and related ir .3, V E _= I i ls physical properties varied. There was a close correla- _j Y V` _ “ _-`r 1 tion of yield and quality of tobacco with such Soil j_ j 1 A ..‘·° ‘ t properties as permeability ( rate at which water moves `. j' .-._ ‘·° 1 _ ``.-. A r through the soil) and degree of aggregation (propor- if Y '7 lplpp — . tion of the fine soil particles formed into stable crumbs \/;#° ...·-i ‘ st or granules). The data in Table 1 show these rela- " °’ ‘° `“ ` ‘ r tiOuShipg_ Good yields of high quality tobacco like this require l`avor· ‘ V able physical conditions in the soil in order for the plant , _ te use the su > alv of nutriems effectively. Table I.- The Response of Burley Tobacco to Variations ) ll ' ' in Degree of Aggregation and Permeability of a Maury Silt Loan; Soil Table 2.-— The Influence on Degree oi` Aggregation and L ii;i* "¤¤‘; ---- is--rr T;T; i"Ti' Permeability of a Maury Silt Loam Soil of Diiierent . I)l:¥°`° p(,nm,umh,\. B`"l°`Y1°l”`°°" Intensities of Cropping ¢_ .~\g1Lre1.{ation to water U Yield .~\ere—value mee cc‘o m*4·‘m·"*r"c r4·re"*L—·rm · ~ , , 6 . ——~—f n-· . °Z 65.6% 4.62 mem/1.r 2266 ii) $12.33 ,_-w¥2i‘*#£>&E-e2..-..2 ...... .. . -i?*’*"i***`“*-‘· ew .[2_Q¢%, r;_()1 " [888 " (Ogg lobacco after 50-yr. old bluegrass sod .... 65.6% LH., lr. _ W] gg_5% 26;; " [757 " 714 Rotation of Tobacco-small grain-sod ........ 42.9% ‘. ( ifi *%@fY'l 165% {gg " (gh] " 474 Tobacco each year for 18 years .................. 29.5% in $.01* —- --——— — —--— ~ — -— - - - Tobacco each year for 50 years ................ 16.5% mfé ri . . . . . . . TQTTT T IT Y T T. .' Y m’* 'lhe intensity of use of land for row crops influences on 5omc PhY$*c¤l P1oPc1Uc$ et the ¤o1l 1* 511oWo io y the physical properties of soil. The extent of deteriora- Tablc 2- ‘ _.( tion of structure and related properties was determined Chcmgcs io fcmhtY r€S¤1¤¤g from thc ci`oPP1US SYS" b on plots used for burley tobacco. These plots included; tcm mc not cUUYclY Ycspooslblc for dlgcrcoccs m gi` (1) tobacco after a bluegrass sod over 50 years old; yields after Sed ci'oP$· This was mdlcatcd by comPm" ,- (2) tobacco grown in a rotation with small grain and ing thc i`c$Poo$c of thc tobacco cl`oP to <1ift€r€r¤t fcc A ()I·Chnr(l grass vyith {Cd Cloygy; tobacco vyhcsrg llllty levels ()ll plots 1Iz`t\’lIlg 1l1Tl`21.VO1°}.1.l)l(i` Physical COI]- ` crop hm] hwh gl-hwh ouch yuh- fm- 18 Yams with H ditions resulting from intensive use with the response 4, Cover Cmp hftm- Ouch Crop of thimcch. nm] (4) tO_ of the crop on unfertilized land on which physical l` bacco wm.!-C this Crop hud hhhh gmwh (inch yeh]- fm- conditions were favorable. Table 3 summarizes the (_" about 50 years with a cover crop after each crop of dum from fills comparison- _ tobacco. The influence of these cropping programs ((;(mmm(,(] 7,,, pugt, 12) N., ~. 6 l