AGRICULTURE 217

eligible to vote. No informalities in the conduct of such referendum or in
any matters relating thereto shall invalidate said referendum or the result
thereof if notice thereof shall have been given substantially as herein pro-
vided and said referendum shall have been fairly conducted.

The supervisors shall not have authority to enact such proposed ordinance
into law unless at least a majority of the votes cast in such referendum
shall have been cast for approval of the said proposed ordinance. The
approval of the proposed ordinance by a majority of the votes cast in such
referendum shall not be deemed to require the supervisors to enact such
proposed ordinance into law. Land-use regulations prescribed in ordinances
adopted pursuant to the provisions of this section by the supervisors of
any district shall have the force and effect of law in the said district and
shall be binding and obligatory upon all occupiers of lands within such
district. i

Any occupier of land within such district may at any time file a petition
with the supervisors asking that any or all of the land-use regulations pre-
scribed in any ordinance adopted by the supervisors under the provisions
of this section shall be amended, supplemented, or repealed. Land-use
regulations prescribed in any ordinance adopted pursuant to the provisions
of this section shall not be amended, supplemented, or repealed except
in accordance with the procedure prescribed in this section for adoption
of land-use regulations. Referenda on adoption, amendment, supplementa-
tion or repeal of land-use regulations shall not be held more often than
once in six (6) months.

The regulations to be adopted by the supervisors under the provisions
of this section may include:

(1) Provisions requiring the carrying out of necessary engineering
operations, including the construction of terraces, terrace outlets, check
dams, dikes, ponds, ditches, and other necessary structures;

(2) Provisions requiring observance of particular methods of cultivation
including contour cultivating, contour furrowing, lister furrowing, sow-
ing, planting, strip cropping, seeding, and planting of lands to water-con-
serving and erosion preventing plants, trees and grasses, forestation, and
reforestation;

(3) Specifications of cropping programs and tillage practices to be
observed;

(4) Provisions requiring the retirement from cultivation of highly
erosive areas or of areas on which erosion may not be adequately controlled
if cultivation is carried on;

(5) Provisions for such other means, measures, operations, and pro-
grams as may assist conservation of soil resources and prevent or control
soil erosion in the district, having due regard to the legislative findings set
forth in Section 46 of this Article.

The regulations shall be uniform throughout the territory comprised
within the district except that the supervisors may classify the lands within
the district with reference to such factors as soil type, degree of slope,
degree of erosion threatened or existing, cropping and tillage practices in
use, and other relevant factors, and may provide regulations varying with
the type or class of land affected, but uniform as to all lands within each
class or type. Copies of land-use regulations adopted under the provisions
of this section shall be printed and made available to all occupiers of lands
lying within the district.