RESPONSE OF CYPERUS ROTUNDUS L. TO FIVE MOISTURE LEVELS | Zendy

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RESPONSE OF CYPERUS ROTUNDUS L. TO FIVE MOISTURE LEVELS

Author(s) -

Charles H. Davis

Publication year - 1942

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.17.2.311

Subject(s) - cyperus rotundus , moisture , horticulture , water content , botany , biology , chemistry , environmental science , geology , geotechnical engineering , organic chemistry

Cyperus rotundts L.isafield weedknowninalltheSouthern States as nutgrass.Theplantproduces rhizomes, tubers, basalbulbsandfibrous roots belowground, androsettes ofleaves, scapes, andumbelsaboveground. Theresponse ofnutgrass tomoisture isanimportant factor infield eradi- cation andstudies werestarted inthegreenhouse todetermine thelevels at whichtheplant showeddifferential response tosoil moisture. Theresults reported herein constitute partofthedatacollected. Pear, corn, andlemonplants havebeenshowntorespond todifferences inmoisture wellabovetheso-called wilting pointbyALDRICH, WORK,and LEWIS(1), DAVIS(2), LOOMIS(4), andFURRandTAYLOR(3).Thedistance fromtheplanttomoisture wasalsoshownbyALDRICHetal., DAVIS, anid FURRandTAYLORtobeafactor intheavailability ofsoil moisture forplant growth.Intheexperiments cited, growthwasmeasured asthesoil moisture wasreduced, butbecause ofmechanical difficulties thesoilcouldnlotbe maintained atanyonemoisture level. Methods Theexperiment wasstarted August12,1940, with45squat-type gallon potsinwhichtherapidgrowthoftheroots minimized thefactors ofdis- tance.Onetuberwasplanted ineachpot.Thefresh weight ofthetubers varied from1.01to2.24gm.withanaverage weight of1.43gin.Therewas nosignificant difference intheweight oftubers planted, between themliois- tureseries orbetween replications. Aftertwenty-four weeksthere wasno correlation between theinitial weight oftuberandfinal weightoftubers, either within amoisture series orovertheentire experiment. Therealso wasnosignificant correlation between theinitial weight oftuberandeither total orinitial numberofshoots. Thepotsweredivided intoninereplications andsoplacedalong the length ofthegreenhouse benchastominimize variations inlight intensity andtemperature. Thesoil usedtofill thepotswasaheavysilt towhich organic material andsandhadbeenaddedayearbefore thepotswerefilled. Themoisture equivalent ofthemixture was16.93 percent. andthedeter- minedwilting percentage forcornwas8.22percent.Thesoilinthepots absorbed atleast 22percent. ofitsovendryweight ofwaterwhenwatered bystanding inpansofwaterfor24hoursoruntil thesurface waswet.The moisture differences wereobtained bywetting uniformly after thepotshad driedtodifferent levels ofmoisture tosimulate different periods between 311

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