26
English
A. Preparing the terrain:
• As indicated in § 9.2, the terrain must be free from foreign objects. If it is not, any foreign
objects that may hinder a smooth operation must first be removed (stones, branches,
ropes, steel wire, electric cables, water hoses, parasol base, pickets, garden furniture, etc.).
• Objects that can’t be removed must be marked visibly (tree roots, water drain cover, gas
pipes, spraying systems, electric sockets, garden lighting, etc.).
• Also pay attention to any low voltage wires marking the terrain of robotic lawn mowers,
electric dog fencing, etc.
• Large stones in the ground must be removed to avoid damage to the blades.
• If the lawn is very uneven in places (height differences in excess of 20 mm), it is recom-
mended to roll the lawn several times, preferably following rainy weather. Fill any deep pits
with soil. (Lawn aeration (to approx. 60 mm) can be required after overseeding to prevent
the upper soil layer from suffocating.)
For your information:
The operable terrain must be checked prior to operation in order to detect any
possible problems in advance. (Read § 9.6.2 Planning and determining the track
and the work pattern.).
B. Examine the state of the grass.
Check the current vegetation of your lawn: does it contain a lot of moss or other weeds?
What is the grass proportion in the lawn? Does it contain several grass varieties? Are there
dense grass patches, or just a few worn grass stalks?
If the proportion of moss vs. grass is 3/4 to 1/4 per m
2
, do the following:
• Treat the lawn two weeks in advance, preferably before rainfall, with anti-moss spray or a
herbicide against broad-leafed weeds.
• Once moss and weeds have died and turned brown and dry, rake them off the lawn
(preferably with a dethatching machine). Clean the lawn from the raked debris.
• Just before overseeding, cut the grass to a length of 2 cm at most.
If the proportion of grass vs. weeds or bare spots per m2 is approximately 3/4 to 1/4, proceed
as follows:
• Just before overseeding, cut the grass to a length of 2 cm at most.
If pro-active overseeding is the objective (e.g. on a healthy lawn that is rusty after prolonged
drought), or when the remainder of mulch has produced a felt layer on the lawn; or if the
lawn comprises a mono grass type culture with low resistance, do the following:
• Thoroughly dethatch the existing lawn and clean up the dry and old grass.
• Cut the grass to a length of 2 cm at most.
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