MELIWATER INPILTRATTON INTO UNCRACEID, CRACKED AND SUBSOILED SOILS

by

D.M. Gray and R.J. Granger

NOT FOR PUBLICATION

Do not reproduce or distribute any part of this document without thepermission of the authors.

This report was prepared for the National Hydrology Research Institute (NHRI),Environment Canada and forms part of the Memorandum of Understanding between theNHRI and the Division of Hydrology, University of Saskatchewan concerning ERDAProject 3.2—3. “Snow Management and Meltwater Enhancement” funded from theCanada/Saskatchewan Economic and Regional Development Assistance Pund. Duplication and/or use of any part(sI of this report are prohibited without priorconsent of the HRi or the Division of Hydrology.

•D.M. Gray, Chairman, and R.J. Granger. Research Officer. Division of Hydrology.University of Saskatchewan, Saskatoon, Saskatchewan, Canada, SIN OWO.

November, 1989

S

EXECUTIVE SUMMARY

The results rs €tirc.h on the net twater intl i rcr r:fiuranrpr of

COllWtElte3tV trozen uncrac000: OL1’’ romeo. cracsec ar1e I tee set is in a

.I&.rie. erir,s,ne,Jt are uresenree A eumniereIv-truzen SOt.) •].s u•ue. mat noes

nut thaw to arec able uenth dunn sOOweOve:r 85t1 at un

heir water intl itranun tutu sot I cracks maci rins were ouud to areraee

5 3 and 5 3 times the amounts to the same sot is in uncrarked and undtsmu.roeu

conot non i nuependo)nn ut awn labie snow water aaseo on inane findings ann

)r1Cfl field unser-vati one a simuie oractirai modei is derel orion which gtres the

averag-e nienth of intiltrarten uver a subsuiled fiele as a function of line

1 0 A t — a

monet snowfall statistics and renorted catch cit t cieitci 05 )t snijhn e management

practices it s suggesri.•.ro that sunsol i ing at depths between 400 ann 500 an en

soacings between 09 and 1 3 a shouid enhance th.e infiltration nruperti.es of

compieteiv—frozen soiis within the semi—arid Prairie region so that ai. iea.st

in tie first year they are capabie of absorbing most of the snow water

acoamuiated by st.ubbie management practices in a normai snow year.

There is. need for additional. research to estabiish the iongevimy of the

be.neficiai effects of it. snhsoiiing t.reatment on meitwater i.nfiifration

enhancement a:nd the yieid of spring wheat, Observed decreases in both

infiitration and yieid wi.th time suggest a usefai iife of the order of font to

five years.

In the first foot years foi iowing. treatment th.e arnnoai yieids or spri,ng

wheat from subsolied plots of continuous- stubble 4fl..... snow ma.nagement averaged

1033 kg/ha higher t.ha.n the yields, from piot s of on.distnrbed nrtobhi,.e and 4.23

kg/ha hi.gfier than those recorded en fa.liow. The i.ncreass. of tOSS kg. ha, when

oompated to an average a.nnua ncrea,se of 340 h.g]ha on suhsoi l.ed ole ts

snow management. ii. i.ostrat.:es the need to “co.snblne” the orac.t,i. res fur no amen

i..ete.mn An average increa.se in vi.cld ovn.r the study pc.rAod of 3 5 hs,n i:;a ten

each aeidim i.ona.I isa or avail able water and a maxin.r’.tn Increase 01 .10 Kit lilt net miii

— n’ z’ 5 I

T1 OF C:ONTENTS

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EXPERIMENTAL STUDIES

RESULTS AND 010 CUSS ION ..I I.t:ratlon Into End i started C noracked

nailsaenrr of NIPS; ..

Areal intl itraton and Line SoncngUJEICKSU S1j1j5,

e11Oso1Iec1 snisi,fe Exnectancv of SubsoI ii ng Pra.otfoe in

InfiltrationY.iei.d of Spring Wheat

SUMMARY

ACKNOWLEDLEMENTS

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