If during the current fiscal year the directors are not, by reason of the fact that no assessment has been levied, collecting a regular assessment levied during the year immediately preceding, then notwithstanding other provisions of this code, the board of supervisors in each county in which a soil conservation district, or a portion thereof is located may, upon a showing by the directors that funds are needed for the purposes of the district for the current year, appropriate money from the general fund of the county for the use of said district in an amount equal, during any one year, to the amount which said district could have raised by assessment, as limited by this code, in said current year, or so much thereof as may be required. This provision shall not be deemed to prohibit the board of supervisors from appropriating to such districts sums in excess of these amounts.