Document:

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                                                             Exhibit 4.ii(b)

                             SUPPLEMENTAL INDENTURE

            This Supplemental Indenture (this "SUPPLEMENTAL INDENTURE"),
dated as of August 2, 2001, by and among IMC Global Netherlands B.V. (the
"GUARANTEEING SUBSIDIARY"), a subsidiary of IMC Global Inc., a Delaware
corporation (the "COMPANY"), the Company and The Bank of New York, as trustee
under the Indenture referred to below (the "TRUSTEE").

                                W I T N E S E T H

            WHEREAS, the Company has heretofore executed and delivered to the
Trustee an indenture (the "SEVEN YEAR INDENTURE"), dated as of May 17, 2001
providing for the issuance of an aggregate principal amount of up to $400
million of 10.875% Senior Notes due 2008 (the "SEVEN YEAR NOTES");

            WHEREAS, the Company has heretofore executed and delivered to the
Trustee an indenture (the "TEN YEAR INDENTURE" and together with the Seven Year
Indenture, the "INDENTURE"), dated as of May 17, 2001 providing for the issuance
of an aggregate principal amount of up to $200 million of 11.250% Senior Notes
due 2011 (the "TEN YEAR NOTES"and together with the Seven Year Notes, the
"NOTES");

            WHEREAS, Section 10.04 of the Indenture provides that, if a Person
becomes obligated to guarantee the Notes pursuant to the Indenture, the new
guarantor must execute a supplemental indenture to which such Guarantor shall
unconditionally guarantee all of the Company's obligations under the Notes and
the Indenture on the terms and conditions set forth herein and in the Indenture;

            WHEREAS, pursuant to Section 8.06 of the Indenture, the Trustee is
authorized to execute and deliver this Supplemental Indenture.

            NOW THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the
parties hereto mutually covenant and agree for the equal and ratable benefit of
the Holders of the Notes as follows:

            1. CAPITALIZED TERMS.  Capitalized terms used herein without
definition shall have the meanings assigned to them in the Indenture.

            2. AGREEMENT TO GUARANTEE.  The Guaranteeing Subsidiary hereby
agrees to become subject to the terms of the Indenture as a Guarantor.

            3. INCORPORATION OF TERMS OF INDENTURE. The obligations of the
Guaranteeing Subsidiary under the Note Guarantees shall be governed in all
respects by the terms of the Indenture and shall constitute a Note Guarantee
thereunder. The Guaranteeing Subsidiary shall be bound by the terms of the
Indenture as they relate to the Note Guarantees.

            4. NO RECOURSE AGAINST OTHERS. No past, present or future
director, officer, employee, incorporator, stockholder or agent of the
Guaranteeing Subsidiary, as such, shall have any

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liability for any obligations of the Company or the Guaranteeing Subsidiary
under the Notes, any Note Guarantees, the Indenture or this Supplemental
Indenture or for any claim based on, in respect of, or by reason of, such
obligations or their creation. Each Holder of the Notes by accepting a Note
waives and releases all such liability. The waiver and release are part of
the consideration for issuance of the Notes. Such waiver may not be effective
to waive liabilities under the federal securities laws and it is the view of
the SEC that such a waiver is against public policy.

            5. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK
SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE BUT WITHOUT
GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT
THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

            6. COUNTERPARTS.  The parties may sign any number of copies of this
Supplemental Indenture.  Each signed copy shall be an original, but all of them
together represent the same agreement.

            7. EFFECT OF HEADINGS.  The Section headings herein are for
convenience only and shall not affect the construction hereof.

            8. TRUSTEE.  The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this
Supplemental Indenture or for or in respect of the recitals contained herein,
all of which recitals are made solely by the Guaranteeing Subsidiary and the
Company.

                                         * * *

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      IN WITNESS WHEREOF, the parties hereto have caused this First Supplemental
Indenture to be duly executed and attested, all as of the date first above
written.

                       IMC GLOBAL INC.

                       By:  /s/ J. Bradford James
                          --------------------------------------------
                          Name: J. Bradford James
                          Title: Executive Vice President

                       IMC GLOBAL NETHERLANDS B.V.

                       By: [illegible]
                          --------------------------------------------
                          Name: ABN AMRO Trust Company (Nederland) B.V.
                          Title: Director

                       THE BANK OF NEW YORK, AS TRUSTEE

                       By:  /s/ Robert Massimillo
                          --------------------------------------------
                          Name: Robert Massimillo
                          Title: Vice President<Page>

                             SUPPLEMENTAL INDENTURE

                  This Supplemental Indenture (this "SUPPLEMENTAL INDENTURE"),
dated as of November 6, 2001, by and among IMC Phosphates MP Inc. (the
"GUARANTEEING SUBSIDIARY"), a subsidiary of IMC Global Inc., a Delaware
corporation (the "COMPANY"), the Company and The Bank of New York, as trustee
under the Indenture referred to below (the "TRUSTEE").

                                W I T N E S E T H

                  WHEREAS, the Company has heretofore executed and delivered to
the Trustee an indenture (the "SEVEN YEAR INDENTURE"), dated as of May 17, 2001
providing for the issuance of an aggregate principal amount of up to $400
million of 10.875% Senior Notes due 2008 (the "SEVEN YEAR NOTES");

                  WHEREAS, the Company has heretofore executed and delivered to
the Trustee an indenture (the "TEN YEAR INDENTURE" and together with the Seven
Year Indenture, the "INDENTURE"), dated as of May 17, 2001 providing for the
issuance of an aggregate principal amount of up to $200 million of 11.250%
Senior Notes due 2011 (the "TEN YEAR NOTES"and together with the Seven Year
Notes, the "NOTES");

                  WHEREAS, Section 10.05 of the Indenture provides that any Note
Guarantee will automatically and unconditionally be released and discharged upon
the designation of a Restricted Subsidiary as an Unrestricted Subsidiary in
accordance with the Indenture; and

                  WHEREAS, pursuant to Section 8.06 of the Indenture, the
Trustee is authorized to execute and deliver this Supplemental Indenture.

                  NOW THEREFORE, in consideration of the foregoing and for other
good and valuable consideration, the receipt of which is hereby acknowledged,
the parties hereto mutually covenant and agree for the equal and ratable benefit
of the Holders of the Notes as follows:

                  1. CAPITALIZED TERMS.  Capitalized terms used herein without
definition shall have the meanings assigned to them in the Indenture.

                  2. RELEASE OF THE GUARANTEE. The Guaranteeing Subsidiary shall
hereby be designated as an Unrestricted Subsidiary under the Indenture and the
Note Guarantee of the Guaranteeing Subsidiary shall be automatically and
unconditionally released pursuant to the terms of the Indenture.

                  3. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF
NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE BUT
WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT
THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED
THEREBY.

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                  4. COUNTERPARTS. The parties may sign any number of copies of
this Supplemental Indenture. Each signed copy shall be an original, but all of
them together represent the same agreement.

                  5. EFFECT OF HEADINGS. The Section headings herein are for
convenience only and shall not affect the construction hereof.

                  6. TRUSTEE. The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this Supplemental
Indenture or for or in respect of the recitals contained herein, all of which
recitals are made solely by the Guaranteeing Subsidiary and the Company.

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         IN WITNESS WHEREOF, the parties hereto have caused this First
Supplemental Indenture to be duly executed and attested, all as of the date
first above written.

Dated: November 6, 2001

                                 IMC GLOBAL INC.

                                 By: /s/ J. Reid Porter
                                     Name: J. Reid Porter
                                     Title: Executive Vice President and CFO

                                 IMC PHOSPHATES MP INC.

                                 By: /s/ J. Reid Porter
                                     Name:  J. Reid Porter
                                     Title:  Vice President

                                 THE BANK OF NEW YORK, AS TRUSTEE

                                 By: /s/ Mary LaGumina
                                     -----------------------------------------
                                     Name:  Mary LaGumina
                                     Title: Vice President<Page>
                                                               Exhibit 10.iii(a)

                                    ADDENDUM

The following was agreed to on July 10, 2001 as an addendum to the Employment
Agreement, as amended and restated, dated October 24, 2000, between Douglas A.
Pertz and IMC Global.

ARTICLE 1, EMPLOYMENT

         Section 1.  TERM.  The current Agreement is amended as follows:

         1. TERM. The term of this Agreement (the "Term") shall commence on
September 15, 2001 (the "Effective Date") and shall terminate on the second
anniversary of the Effective Date; provided, however, that unless (i) the
Company gives written notice of its intent to terminate the Agreement at least
three (3) months prior to the second anniversary of the Effective Date or (ii)
the Executive gives notice of his intent to terminate the Agreement at least six
(6) months prior to the second anniversary of the Effective Date, this Agreement
shall renew automatically for an additional one year term and shall continue to
renew automatically for additional one year terms unless (i) written notice of
the Company's intent to terminate the Agreement is given at least three (3)
months prior to the expiration of the then current term or (ii) written notice
of the Executive's intent to terminate the Agreement is given at least six (6)
months prior to the expiration of the then current term.

ARTICLE 3, TERMINATION OF EMPLOYMENT

         Section 1 (d) 2. The current Agreement is amended as follows:

         2. An amount equal to three times the target award for the Executive
for the year in which the Severance Event occurs under the Company's Management
Incentive Compensation Program, or successor annual bonus plan in effect;

         Section 3.  TERMINATION AT EXPIRATION OF AGREEMENT.  The current
Agreement is amended as follows:

         3. TERMINATION AT EXPIRATION OF AGREEMENT. If the Executive's
employment is terminated at the expiration of this Agreement as provided in
Section 1.01, or if the Executive's employment is terminated at any time by
mutual agreement of the Executive and Board of Directors, the Executive shall be
entitled to receive the Severance Benefits described above in Section
3.01(d)(1)-(9); provided, however, that wherever the word "three" appears in
Section 3.01, it shall be replaced with the word "two."

In consideration for the above, the Company agrees to grant the Executive
175,000 stock options at a price of $9.60, the closing price as of July 10,
2001, and grant the Executive 100,000 shares of restricted stock. These options
will have a ten year term and the options and restricted shares will vest as
follows: one third will vest at the first anniversary of the award, another
third will vest at the second anniversary and the final third will vest at the
third anniversary. The terms

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and conditions of such options and restricted
shares shall be governed by the Executive's individual award agreements and the
Company's 1988 Stock Option and Award Plan, as amended from time to time.

AGREED TO:

IMC Executive Committee

By:  /s/ RAYMOND F. BENTELE                          July 10, 2001
   -------------------------------                 -----------------------
         Raymond F. Bentele                          Date

IMC Compensation Committee

By:  /s/ RICHARD L. THOMAS                           July 10, 2001
   -------------------------------                 -----------------------
         Richard L. Thomas                           Date

Executive

By:  /s/ DOUGLAS A. PERTZ                            July 10, 2001
   -------------------------------                 -----------------------
         Douglas A. Pertz                            Date

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