Energy is the key factor for the economic growth of any nation and India is no exception. In spite of increasing availability of energy, there is always need for more. This is the reason which has prompted the world countries to develop alternative sources of energy like geothermal, solar nd wind. Moreover we must use the available coal reserves sustainably.
In this context, crops producing hydrocarbons are very important. Petroplants accumulate photosynthetic products like hydrocarbons of high molecular weight. In 1979, M. Calvin of the University of California reported the collection and use of photosynthetically produced hydrocarbons. He suggested them as a substitute for conventional petroleum sources.
Most of the plants belonging to the family Euphorbiaceae, Asclepiadaceae, Anacardiaceae, Asteraceae, Caprofoliaceae and Lamiaceae are promising petroplants. Euphorbia lathyris of family Euphorbiaceae is considered as most suitable petrocrop containing more than 5% oil and polymeric hydrocarbons.
The following is the list of petrocrops
Petro Crop | Family Name |
---|---|
Agave americana | Agavaceae |
Allemanda vathartica | Apocynaceae |
Nerium odorum | Apocynaceae |
Tabernaemontana coronaria | Apocynaceae |
Thevetai nerifolia | Apocynaceae |
Wrightis tomentosa | Asclepiadaceae |
Aclepias curassavia | Asclepiadaceae |
Calotropis gigantica | Asclepiadaceae |
Ceropegia tuberosa | Asclepiadaceae |
Cryptostegia grandiflora | Asclepiadaceae |
Pergularia daemia | Asclepiadaceae |
Copaifera longsdorfii | Euphorbiaceae |
Euphorbia lathyris | Euphorbiaceae |
Hevea Brasiliensis | Euphorbiaceae |
Jatropa curcas | Euphorbiaceae |
Pedilanthus thithymaloides | Euphorbiaceae |
Aloe vera | Liliaceae |
Sansevieria sps. | Liliaceae |
Artocarpus integrifolia | Moraceae |
Argemone mexicana | Papaveraceae |
Pedalium murex | Pedaliaceae |
Pittosporum resinferum | Pittosporaceae |
Madhuca indica | Sapotaceae |
Mimusops elengi | Sapotaceae |
Vitis quadrangularis | Vitaceae |
Technically, energy plantation means growing selected species of trees and shrubs which are harvestable in a comparably shorter time and are specifically meant for fuel. These plantations help provide wood either for domestic or industrial purposes.
The energy plantations provide almost inexhaustible renewable sources of energy which are local and independent of unreliable and finite sources of fuel. The total time constant for each cycle is 3-8 years only.
The attractive features of energy plantations are:
Energy plantations are the plants planted only for use as fuel. The woody plants have been used since ancient times to generate fire for domestic and industrial purpose. In recent years, to meet the ever growing demand of energy, plantation of energy plants is been encouraged. We are all aware that trees are cut in many of the forest belts of India like Gangetic plains, Siwalik region and foot-hills of Himalayas.
In terms of fuel wood production, India is the biggest, but the per capita fuel wood production is very low. In India, people of hill area hardly get fire-wood plants and they have to go to interior of forest to collect wood-falls. Also introduction of technologies developed for plains is not achievable in these areas.
For example, they cannot be motivated to use solar cooker, because of being solely traditional and religious. Even gobar gas plant cannot be useful in hills, due to low temperatures. Therefore, renewable source of energy is highly desirable for survival of population in hills and for reducing the pressure on forests. And thus, energy plantation has got great support in our country.
For obtaining good amount of biomass, afforestation and forest management government has started many plans like social forestry, silviculture and agro-horticulture practices in waste and barren lands. These programmes include growing of drought resistant, salt resistant, pollutant resistant and high density energy plantations (HDEP) in waste and barren
The technique used in high density energy plantations, HDEP is the practice of planting trees at close spacing. Here the trees grow rapidly due to struggle for survival. It provides fast and high returns with many opportunities of permanent income and employment.
Plantation through social forestry has been highlighted by the Government of India to meet the demand of fuel and fodder in the rural areas. Social forestry will definitely decrease the ever increasing pressure on the forests. Through social forestry, trees are planted along road sides, canals, railway lines and waste lands in villages.
The following must be considered while selecting plant species for energy plantations:
The following is the list of plants included in social forestry,
Petro Crop | Family Name |
---|---|
Acacia nilotica |
Fabaceae |
Albizia lebbek |
Fabaceae |
Albizia procera |
Fabaceae |
Anthocephalus chinensis | Rubiaceae |
Azardirachta indica | Meliaceae |
Bauhinia variegata | Fabaceae |
Butea monosperma | Fabaceae |
Cassia fistula | Fabaceae |
Dalbergia sisso | Fabaceae |
Eucalyptus globulus | Mrytaceae |
Eucalyptus citriodora | Myrtaceae |
Ficus glomerata | Moraceae |
Lagerstroemia speciosa | Lythraceae |
Madhuca indica | Sapotaceae |
Morus alba | Moraceae |
Populus ciliata | Salicaceae |
Populus nigra | Salicaceae |
Terminalia arjuna | Combritaceae |
Toona ciliata | Melicaceae |
Salix alba | Salicaceae |
Salix tetrasperma | Salicaceae |
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