Sloping Land Agricultural Technology
Sloping Agriculture Land Technology (SALT 1)
Since the mid-1970’s, the SALT 1 technology has utilised a number of fast growing nitrogen-fixing trees and shrubs (NFT/S) for soil conservation and a biological fertiliser source in the uplands. These NFT/S are planted in double hedgerows along the contour of sloping area every four to five meters apart. These rich nitrogen fixing hedges act as a physical barrier to soil erosion as well as giving a rich NFP mulch which enhances the soil erosion control potential for the system as well as providing a good source of organic nutrients for the system and a soil covering conditioner. The major NFT/S hedgerow species utilized are Desmodium rensonii, Flemingia macrophylla, Gliricidia sepium, Indigofera tyesmani, Leucaena sp. and Calliandra sp.
Simple Agro-Livestock Technology (SALT 2)
This technology is a variation of the SALT 1 technology with a heavy emphasis being placed on an animal component. In our SALT 2 model at the Philippines, half of the land area is dedicated to agroforestry trees (mainly NFT/S) dedicated to use solely as forage/fodder for the goats while the other half is dedicated to food and income for the farm family. Again, the main agroforestry species mentioned above for SALT 1 are primarily used in this system.
Sustainable Agroforest Land Technology (SALT 3)
Another variation of the SALT 1 technology is SALT 3 where a heavier emphasis is placed on small-scale reforestation for the farm family. This is a two-hectare model where one hectare is utilised to a regular SALT 1 project while the remaining one-hectare is planted into a small, farmer-managed forest. The majority of the agroforestry species utilised in the reforestation aspect are again NFT/S such as Albizia saman, Pterocarpus indicus, Acacia auriculiformis, A. mangium, and Leucaena diversifolia. However, a number of non-NFT/S are also used in this agroforestry model including Swetinia macrophylla, Gmelina arborea and Eucalyptus spp.
Small Agrofruit Livelihood Technology (SALT 4)
A classification of trees which often escape the attention of agroforesters are the fruit trees which are the building block of the SALT 4 technology. Working from the idea that some farmers would prefer fruit production over other commodities, SALT 4 integrates durian (Durio zibethinus), lansones (Lansium domesticum), rambutan (Nephelium lappaceum), mango (Mangifera indica), jackfruit (Artocarpus heterophyllus), coffee (Coffea spp.) and calamansi (Citrus madurensis) into a half-hectare demonstration with high returns on investment. The majority of agroforestry fruit trees utilised here are non-NFT/S but are supported by the presence of N-fixing hedgerows for erosion control and soil fertility management.
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