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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001110783-08-000139.txt : 20080903
<SEC-HEADER>0001110783-08-000139.hdr.sgml : 20080903
<ACCEPTANCE-DATETIME>20080903143350
ACCESSION NUMBER:		0001110783-08-000139
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080901
FILED AS OF DATE:		20080903
DATE AS OF CHANGE:		20080903

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MONSANTO CO /NEW/
		CENTRAL INDEX KEY:			0001110783
		STANDARD INDUSTRIAL CLASSIFICATION:	AGRICULTURE CHEMICALS [2870]
		IRS NUMBER:				431878297
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0831

	BUSINESS ADDRESS:	
		STREET 1:		800 N LINDBERGH BLVD
		CITY:			ST LOUIS
		STATE:			MO
		ZIP:			63167
		BUSINESS PHONE:		3146941000

	MAIL ADDRESS:	
		STREET 1:		800 NORTH LINDBERGH BLVD
		CITY:			ST LOUIS
		STATE:			MO
		ZIP:			63167

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ATLEE FRANK V III
		CENTRAL INDEX KEY:			0001126217
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-16167
		FILM NUMBER:		081053628

	BUSINESS ADDRESS:	
		STREET 1:		800 N. LINDBERGH BLVD.
		CITY:			ST. LOUIS
		STATE:			MO
		ZIP:			63167
		BUSINESS PHONE:		3146941000

	MAIL ADDRESS:	
		STREET 1:		800 N. LINDBERG BOULEVARD
		STREET 2:		MAIL STOP E2NK
		CITY:			ST. LOUIS
		STATE:			MO
		ZIP:			63167
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-09-01</periodOfReport>

    <issuer>
        <issuerCik>0001110783</issuerCik>
        <issuerName>MONSANTO CO /NEW/</issuerName>
        <issuerTradingSymbol>MON</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001126217</rptOwnerCik>
            <rptOwnerName>ATLEE FRANK V III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>800 N. LINDBERGH BLVD.</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. LOUIS</rptOwnerCity>
            <rptOwnerState>MO</rptOwnerState>
            <rptOwnerZipCode>63167</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-09-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>897</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>114.25</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>73135</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of deferred common stock deliverable upon termination as a director under the Monsanto Company Non-Employee Director Equity Incentive Compensation Plan.  Shares of deferred stock are credited in the form of hypothetical shares to a stock unit account in installments on the last day of each plan month during the director's term and for the payment of dividends.  Shares of deferred stock not credited to the stock unit account because of termination as a director before the end of the director's term are forfeited.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Christopher A. Martin, Attorney-in-Fact</signatureName>
        <signatureDate>2008-09-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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