Sociedad Química y Minera de Chile (SQM) 20-F 2005 FY Annual report (foreign)

Exhibit 13.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Patricio Contesse, Chief Executive Officer of Sociedad Química y Minera de Chile S.A. (“SQM”), a corporation incorporated under the laws of the Republic of Chile, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

1.   The Annual Report of SQM on Form 20-F for the fiscal year ended December 31, 2005, as filed with the Securities and Exchange Commission, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.   The information contained in such Annual Report on Form 20-F fairly presents, in all material respects, the financial condition and results of operations of SQM.

/s/ Patricio Contesse G.

Name: Patricio Contesse G.

Title: Chief Executive Officer

Date: June 30, 2006