GRASS PLANTING METHOD
PURSPOSE AND OBJECTIVES
This specification is meant as a guidance for BPJT (Indonesia Toll Road Authority) in planning reinforcement of embankment slope and excavation on Village and urban roads with the purpose of obtaining better roads in accordance with its function.
Slope enforcement is a form of non structural construction and or grass plant to be used to protect the slope surface of excavation or embankment due to soil erosion. However, this slope reinforcement is not functioned to hold load.
Terracing is a slope condition formed as stairs with the terrace bench sloping inward, which can be used on high embankment or excavation and functioning to:
· Add slope stability
· Make it easy in maintenance
· Make it possible as landscaping
SCOPE AND FUNCTION
This specification includes matters that are related to:
· Function of slope reinforcement;
· Types of slope reinforcement;
· Materials to be used;
· Form of slope reinforcement.
Slope reinforced with plant/grass has several functions and benefits, inter alia:
· To protect slope surface against erosion/sidementation and other disruptions from outside;
· To stabilize slope;
· To add to aesthetic;
· Not to function as load bearing.
SLOPE STABILIZING METHOD
In stabilizing the slope, several types of slope-stabilizing materials can be used such as:
· Construction materials;
· Plant and grass;
· Other materials.
SLOPE REINFORCED WITH PLANT/GRASS
Plants and grass that are used should be able to bear erosion on the slope effectively.
Soil covering plants/grass or plants of soil conservation can be in the form of:
· Soil-covering plants
· Plants with fibrous roots
· Plants with deep and long roots
Grass plants usually used for grass-reinforced slope reinforcement at the slope of 0 - 60 degrees.
Grass planting has two methods, namely:
· Grass planting with seeds or spring is recommended for areas with the slope of 0 - 30 degrees
· Planting of sods (sodding) with the dimension of 0 - 5 cm with spaces of 5 - 15 cm in order to enable quick growing.
Spaced Sodding Method (Solid Sodding)
SOIL COVERING PLANTS
With planting pattern using dew grass (Polystria Amaura), planting points are made in stagger or in line (Strip sodding) in order that quick growth with natural assimilation assisted with sunlight can be obtained. Example of strip sodding is as follows:
GRASS MAINTAINING METHOD
PURPOSE, OBJECTIVES AND SCOPE
Purpose and Objectives
1) The purpose of maintaining road plants is to be used as a reference for Indonesia Toll Road Authority in executing its duty related to maintenance of road landscape within the Right Of Road (DAMIJA).
2) To uniform maintenance method so that good results will be obtained.
Maintenance method of road landscaping plant includes description, requirements, provisions, work method and schedule of road landscaping plant maintenance.
Road landscape is the face of land character or site formed of road environment, either natural element such as land topography having beautiful panorama, or is formed with landscape element created by man adjusted to existing land.
Road landscape has characteristic as it should be adjusted to road geometric and designated especially for the comfort of road users. It is also made to create beautiful harmonious road environment and meets safety function.
Plant Maintenance Requirements
General Requirements of Plant Maintenance is as follows:
· SOIL LOOSENING AND WEED CONTROL
· PREVENTION AND ERADICATION OF PEST
· REPLACEMENT OR REPLANTING
WATERING, SOIL LOOSENING & WEED CONTROLLING AND WEEDING
It is carried out to nourish plant, thus preventing decay.
Soil loosening & weed controlling and weeding
It is done to loosen soil and to get rid of weeds around the plant
1. Trimming at post planting maintenance is carried out:
· On plant and weeds by means of trimming broken decayed/dried leaves or twigs in order the plant growth is not obstructed.
· To maintain plant's health. Trimmed disease-affected leaves or twigs should be disposed of to prevent other parts from being infected.
2. Trimming at routine maintenance is carried out:
· To control untidy plant growth, which disturbs surrounding/road users' vision
· To maintain plant's health, disease-affected leaves or twigs, fungi or other parasites should immediately be trimmed / cut to prevent them from spreading to other parts of the plants.
· To get rid of destroyed, dead, old stalks/twigs.
· To maintain the form or dimension of the plant.
· To reduce evaporation in long dry season so that the plant will not die of dryness (carried out at the end of rainy season, to reduce number of leaves so that stalks will not be broken in rainy season.
· To maintain plant growth well; trimming or cutting time needs to be well-scheduled.
· To form the ideal shape of plants as planned, trimming or cutting should be carried out when the plants have thick leaves.
Fertilizing is done at post planting maintenance to expedite root and vegetative growth such as leaves / stalks at routine maintenance in order to:
· To increase soil fertility by means of giving additional organic and inorganic fertilizers
· To repair physical condition of the soil, i.e. effective depth of the soil is the depth of soil layer where plant rooting can develop freely, texture, moisture and HVAC ground.
· To repair chemical condition of the soil, i.e. by fertilizing, observing soil reaction and the availability of nutrient for plant growth and to repair soil pH value so that it will rach pH of around 6.5 (Neutral pH).
· To repair biological condition of the soil, i.e. microbiological condition of the soil as soil organic material, humification, mineralization and air nitrogen fixation.
Prevention and Eradication of Pest/Disease
Prevention and Eradication of Pest or Disease is required to maintain plants so that they will not be infected with pest/disease, namely by means of spraying pesticide onto the stalks, leaves or all twigs.
REPLACEMENT OF PLANTS AND REPLANTING
Replacement of Plants and Replanting
Road landscape plant that needs replacing is:
· Lost/dead plants
· Broken plants (due to being hit by vehicles)
· Plant, which is heavily destroyed by pest, so it may spread to other plants