868 LAWS OF MARYLAND. [CH. 437

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 sec-
tion by the supervisors of any district shall have the force and
effect of law in the said district and shall be binding and obli-
gatory upon all occupiers of lands within such district.

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 prescribed 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amended, supplemented, or repealed.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 pro-
visions 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repealed except in accordance with the procedure prescribed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. Referen-
da on adoption, amendment, supplementation 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 furrow-
ing, lister, furrowing, sowing, planting, strip cropping, seed-
ing, and planting of lands to water-conserving and erosion
preventing plants, trees and grasses, forestation, and reforesta-
tion;

(3) Specifications of cropping programs and tillage prac-
tices 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 programs 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 16 of
this Act.

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 threat-