Terraces vegetable farm within a forest. (Engr. Djolly Ma. Dinamling (Bureau of Soils and Water Management))

Vegetable Terracing (Philippines)

Description

Vegetable terracing is a technology practiced at which point terraces are established from the contours along mountain slope for crop production.

Vegetables are mostly produced in the mountains of the Cordillera Administrative Region (CAR). It is extensively practiced in the Municipalities of Atok, Buguias, Mankayan, Kibungan, Bakun, Kabayan in Benguet; Bauko in Mountain Province and Tinoc in Ifugao. Benguet is known as the "Salad Bowl of the Philippines" and major producer of temperate vegetables. This is mainly due to the climatic condition of the province which is suitable for vegetable production.Vegetable industry in Benguet is very vital in the country since it supplies 60-70% of the total sub-tropical vegetables in the Philippines. Major vegetable crops grown are potato, cabbage, chinese cabbage, carrots, chayote, beans, lettuce and broccoli. These are sold to traders, consolidators, wholesalers who transport the produce at the La Trinidad Vegetable Trading Post or other local markets in the region.

Purpose of the Technology: Available arable lands are not expanding but the population is increasing. This situation contributes to the conversion of sloping areas to a suitable land for agricultural production,thus, the technology was developed. This had become an economic practicality to the land user as source of livelihood and income. Vegetable terracing is also a conservation measure to minimize soil degradation by varying the terrace type and plot orientation. Some follow the contour while other plots are parallel to the slopes.

Establishment / maintenance activities and inputs: Prior to terrace establishment, vegetation is partly removed. Residues are cleared for the establishment of the contour lines of the area. From the established contour lines, terraces will be graded and leveled depending on the slope of the area. Most of these activities are done manually. After the establishment of the terraces, land preparation is done followed by planting of the vegetables.

Natural / human environment: The area is under humid agro-climate condition with an average annual rainfall of approximately 1000-1500 mm per year. Its elevation ranges from 2000-2500 meter above sea level. Majority of the population is dependent on agricultural activities as their source of income and livelihood. The average farm size of the land users ranges from 0.5 to 1 hectare. Most of these lands are not owned by the farmers but have a tax declaration. These are owned by the government classified as forest reservations or watershed areas.

Location

Location: Benguet, Atok and Buguias, Philippines

No. of Technology sites analysed:

Geo-reference of selected sites
  • 120.7, 16.583

Spread of the Technology: evenly spread over an area (approx. 0.1-1 km2)

In a permanently protected area?:

Date of implementation: more than 50 years ago (traditional)

Type of introduction
Planted vegetables ready for harvest in Atok, Benguet. (Engr. Djolly Ma. P. Dinamling (Bureau of Soils and Water Management))

Classification of the Technology

Main purpose
  • improve production
  • reduce, prevent, restore land degradation
  • conserve ecosystem
  • protect a watershed/ downstream areas – in combination with other Technologies
  • preserve/ improve biodiversity
  • reduce risk of disasters
  • adapt to climate change/ extremes and its impacts
  • mitigate climate change and its impacts
  • create beneficial economic impact
  • create beneficial social impact
Land use

  • Cropland
    • Annual cropping: root/tuber crops - potatoes, vegetables - leafy vegetables (salads, cabbage, spinach, other), vegetables - root vegetables (carrots, onions, beet, other)
    Number of growing seasons per year: 2

Water supply
  • rainfed
  • mixed rainfed-irrigated
  • full irrigation

Purpose related to land degradation
  • prevent land degradation
  • reduce land degradation
  • restore/ rehabilitate severely degraded land
  • adapt to land degradation
  • not applicable
Degradation addressed
  • soil erosion by water - Wt: loss of topsoil/ surface erosion
  • chemical soil deterioration - Cn: fertility decline and reduced organic matter content (not caused by erosion)
SLM group
  • cross-slope measure
SLM measures
  • agronomic measures - A1: Vegetation/ soil cover
  • structural measures - S1: Terraces

Technical drawing

Technical specifications
Vegetables planted in raised beds.

Location: Buguias. Benguet

Date: 11-13-15

Technical knowledge required for field staff / advisors: moderate

Technical knowledge required for land users: moderate

Main technical functions: control of dispersed runoff: impede / retard, control of concentrated runoff: impede / retard, reduction of slope angle

Contour planting / strip cropping
Material/ species: Cabbage
Quantity/ density: 40 tons/ha

Agronomic measure: contour planting / strip cropping
Material/ species: Carrots
Quantity/ density: 20 tons/ha

Agronomic measure: contour planting / strip cropping
Material/ species: Potato
Quantity/ density: 20 tons/ha

Structural measure: terrace: forward sloping (earth and stone)
Author: Mr. Patricio A. Yambot, Bureau of Soils and Water Management

Establishment and maintenance: activities, inputs and costs

Calculation of inputs and costs
  • Costs are calculated:
  • Currency used for cost calculation: USD
  • Exchange rate (to USD): 1 USD = n.a
  • Average wage cost of hired labour per day: 3.33333
Most important factors affecting the costs
n.a.
Establishment activities
  1. Establishment of terraces (Timing/ frequency: None)
Establishment inputs and costs
Specify input Unit Quantity Costs per Unit (USD) Total costs per input (USD) % of costs borne by land users
Labour
Building terraces Persons/day 120.0 4.44166666 533.0 100.0
Equipment
tools pieces 2.0 6.666666 13.33 100.0
Total costs for establishment of the Technology 546.33
Total costs for establishment of the Technology in USD 546.33
Maintenance activities
  1. Land Preparation (Timing/ frequency: None)
  2. Application of chicken manure (Timing/ frequency: None)
  3. Planting (Timing/ frequency: None)
  4. Side raising including application of fertilizer (Timing/ frequency: None)
  5. Weeding (Timing/ frequency: None)
  6. Spraying of insecticide (Timing/ frequency: None)
  7. Harvesting (Timing/ frequency: None)
Maintenance inputs and costs
Specify input Unit Quantity Costs per Unit (USD) Total costs per input (USD) % of costs borne by land users
Labour
Land preparation Persons/day 30.0 3.3333333 100.0 100.0
Planting Persons/day 15.0 3.333333 50.0 100.0
Applying Fertilizer and sprying insecticide Persons/day 31.0 3.333333 103.33 100.0
Weeding/Harvesting Persons/day 18.0 3.333333 60.0 100.0
Plant material
seeds ha 1.0 11.11 11.11 100.0
Fertilizers and biocides
Inseciticides litres 2.5 13.156 32.89 100.0
Fertilizer bags 7.0 26.66714 186.67 100.0
Chicken manure bags 15.0 5.5553333 83.33 100.0
Total costs for maintenance of the Technology 627.33
Total costs for maintenance of the Technology in USD 627.33

Natural environment

Average annual rainfall
  • < 250 mm
  • 251-500 mm
  • 501-750 mm
  • 751-1,000 mm
  • 1,001-1,500 mm
  • 1,501-2,000 mm
  • 2,001-3,000 mm
  • 3,001-4,000 mm
  • > 4,000 mm
Agro-climatic zone
  • humid
  • sub-humid
  • semi-arid
  • arid
Specifications on climate
Thermal climate class: tropics
Slope
  • flat (0-2%)
  • gentle (3-5%)
  • moderate (6-10%)
  • rolling (11-15%)
  • hilly (16-30%)
  • steep (31-60%)
  • very steep (>60%)
Landforms
  • plateau/plains
  • ridges
  • mountain slopes
  • hill slopes
  • footslopes
  • valley floors
Altitude
  • 0-100 m a.s.l.
  • 101-500 m a.s.l.
  • 501-1,000 m a.s.l.
  • 1,001-1,500 m a.s.l.
  • 1,501-2,000 m a.s.l.
  • 2,001-2,500 m a.s.l.
  • 2,501-3,000 m a.s.l.
  • 3,001-4,000 m a.s.l.
  • > 4,000 m a.s.l.
Technology is applied in
  • convex situations
  • concave situations
  • not relevant
Soil depth
  • very shallow (0-20 cm)
  • shallow (21-50 cm)
  • moderately deep (51-80 cm)
  • deep (81-120 cm)
  • very deep (> 120 cm)
Soil texture (topsoil)
  • coarse/ light (sandy)
  • medium (loamy, silty)
  • fine/ heavy (clay)
Soil texture (> 20 cm below surface)
  • coarse/ light (sandy)
  • medium (loamy, silty)
  • fine/ heavy (clay)
Topsoil organic matter content
  • high (>3%)
  • medium (1-3%)
  • low (<1%)
Groundwater table
  • on surface
  • < 5 m
  • 5-50 m
  • > 50 m
Availability of surface water
  • excess
  • good
  • medium
  • poor/ none
Water quality (untreated)
  • good drinking water
  • poor drinking water (treatment required)
  • for agricultural use only (irrigation)
  • unusable
Water quality refers to:
Is salinity a problem?
  • Ja
  • Nee

Occurrence of flooding
  • Ja
  • Nee
Species diversity
  • high
  • medium
  • low
Habitat diversity
  • high
  • medium
  • low

Characteristics of land users applying the Technology

Market orientation
  • subsistence (self-supply)
  • mixed (subsistence/ commercial)
  • commercial/ market
Off-farm income
  • less than 10% of all income
  • 10-50% of all income
  • > 50% of all income
Relative level of wealth
  • very poor
  • poor
  • average
  • rich
  • very rich
Level of mechanization
  • manual work
  • animal traction
  • mechanized/ motorized
Sedentary or nomadic
  • Sedentary
  • Semi-nomadic
  • Nomadic
Individuals or groups
  • individual/ household
  • groups/ community
  • cooperative
  • employee (company, government)
Gender
  • women
  • men
Age
  • children
  • youth
  • middle-aged
  • elderly
Area used per household
  • < 0.5 ha
  • 0.5-1 ha
  • 1-2 ha
  • 2-5 ha
  • 5-15 ha
  • 15-50 ha
  • 50-100 ha
  • 100-500 ha
  • 500-1,000 ha
  • 1,000-10,000 ha
  • > 10,000 ha
Scale
  • small-scale
  • medium-scale
  • large-scale
Land ownership
  • state
  • company
  • communal/ village
  • group
  • individual, not titled
  • individual, titled
Land use rights
  • open access (unorganized)
  • communal (organized)
  • leased
  • individual
Water use rights
  • open access (unorganized)
  • communal (organized)
  • leased
  • individual
Access to services and infrastructure
health

poor
good
education

poor
good
technical assistance

poor
good
employment (e.g. off-farm)

poor
good
markets

poor
good
energy

poor
good
roads and transport

poor
good
drinking water and sanitation

poor
good

Impacts

Socio-economic impacts
risk of production failure
increased
decreased

production area (new land under cultivation/ use)
decreased
increased

diversity of income sources
decreased
increased

Socio-cultural impacts
food security/ self-sufficiency
reduced
improved

recreational opportunities
reduced
improved

community institutions
weakened
strengthened

Livelihoods and human well-beeing
reduced
improved

Ecological impacts
surface runoff
increased
decreased

soil loss
increased
decreased

vegetation cover
decreased
increased


Natural vegetation such as forest is partially reduced for vegetable production

Off-site impacts
downstream flooding (undesired)
increased
reduced

buffering/ filtering capacity (by soil, vegetation, wetlands)
reduced
improved

Cost-benefit analysis

Benefits compared with establishment costs
Short-term returns
very negative
very positive

Long-term returns
very negative
very positive

Benefits compared with maintenance costs
Short-term returns
very negative
very positive

Long-term returns
very negative
very positive

Climate change

Climate-related extremes (disasters)
local rainstorm

not well at all
very well
general (river) flood

not well at all
very well

Adoption and adaptation

Percentage of land users in the area who have adopted the Technology
  • single cases/ experimental
  • 1-10%
  • 11-50%
  • > 50%
Of all those who have adopted the Technology, how many have done so without receiving material incentives?
  • 0-10%
  • 11-50%
  • 51-90%
  • 91-100%
Number of households and/ or area covered
NA
Has the Technology been modified recently to adapt to changing conditions?
  • Ja
  • Nee
To which changing conditions?
  • climatic change/ extremes
  • changing markets
  • labour availability (e.g. due to migration)

Conclusions and lessons learnt

Strengths: land user's view
Strengths: compiler’s or other key resource person’s view
  • Source of livelihood for the land users in the mountainous area.

    How can they be sustained / enhanced? It should be balanced by relevant environmental protective measures and alternative farming systems such as agroforestry.
  • Minimize soil erosion

    How can they be sustained / enhanced? Construction of Small Water Impounding System (SWIS) and proper drainage canal.
Weaknesses/ disadvantages/ risks: land user's viewhow to overcome
Weaknesses/ disadvantages/ risks: compiler’s or other key resource person’s viewhow to overcome
  • Vegetation is partially removed for vegetable production. Protection of remaining areas through regulations and implementations of related policies.

References

Compiler
  • Philippine Overview of Conservation Approaches and Technologies
Editors
Reviewer
  • David Streiff
  • Alexandra Gavilano
Date of documentation: Nov. 23, 2015
Last update: Junie 13, 2019
Resource persons
Full description in the WOCAT database
Linked SLM data
Documentation was faciliated by
Institution Project
This work is licensed under Creative Commons Attribution-NonCommercial-ShareaAlike 4.0 International