Soil is defined as upper layer of the earth composed of loose surface material. It is a mixture of many substances including endless variety of minerals, remnants of plants and animals, water and air. It is the end product of continuing interaction between the parent material, local climate, plant and animal organisms and elevation of land. Since each of the elements varies over space, soils also differ from place to place. Soil is an important segment of our ecosystem, as it serves an anchorage for plants and source of nutrients. Thus, soil is the seat, the medium and fundamental raw material for plant growth.
Soils are formed from materials that have resulted from the disintegration of rocks by various processes of physical and chemical weathering. The nature and structure of a given soil depends on the processes and conditions that formed it:

• Breakdown of parent rock: weathering, decomposition, erosion.
• Transportation to site of final deposition: gravity, flowing water, ice, wind.
• Environment of final deposition: flood plain, river terrace, glacial moraine, lacustrine or marine.
• Subsequent conditions of loading and drainage: little or no surcharge, heavy surcharge due to ice or overlying deposits, change from saline to freshwater, leaching, contamination.

According to ICAR Indian soils are classified as:-

• Alluvial soils:-Alluvial soils are formed mainly due to silt deposited by Indo Gangetic Brahmaputra rivers. In coastal regions some alluvial deposits are formed due to wave action.
• Black soils:-The black soils are found mainly on the Deccan lava region covering large parts of Maharashtra, some parts of Gujarat and Madhya Pradesh and small parts of Karnataka, Andhra Pradesh and Tamil Nadu. The soils are formed by disintegration of volcanic basaltic lava. The colour of the soil is generally black due to presence of compounds of aluminium and iron.
• Red soils:- these soils are light textured with porous and friable structure and there is absence of lime Kankar and free carbonates. They have neutral to acidic reaction and are deficient in nitrogen humus, phosphoric acid and lime.
• Laterite and Lateritic soils:-These soils are red to reddish yellow in colour and low in N, P, K, lime and magnesia. These soils are formed in-situ under conditions of high rainfall with alternation dry and wet periods. On account of heavy rainfall there is an excessive leaching of soil colloids and silica hence the soils are porous.
• Forest and Mountain soils:-These soils occur at high elevations as well as at low elevations, where the rainfall is sufficient to support trees. These soils are very shallow, steep, stony, and infertile for the production of field crops. However, they serve a very useful purpose by supplying forest product such as timber and fuel.
• Arid and Desert soils:-These  soils occur in western Rajasthan, Saurashtra, Kutchchh, western Haryana and southern Punjab . The soil is sandy to gravelly with poor organic matter, low humus contents, infrequent rainfall, low moisture and long drought season. The soils exhibit poorly developed horizons.
• Saline and Alkaline soils :-These soils occur in areas having a little more rainfall than the areas of desert soils. They show white incrustation of salts of calcium & Magne sium and sodium on the surface. These are poor in drainage and are infertile.
• Peaty and Marshy soils:-These are soils with large amount of organic matter and considerable amount of soluble salts. The most humid regions have this type of soil. They are black, heavy and highly acidic. They are deficient in potash and phosphate.

Soil erosion is described as the carrying away of soil. It is the removal of the soil by natural elements like water, wind, glacier and wave. Gravity tends to move soil down slope either very slowly as in soil creep or very rapidly as in landslides. The present shape of land has been carved through thousands of years.

Soil conservation is the preventing of soil loss from erosion or reduced fertility caused by over usage,Soil  acidification, salinization or other chemical soil contamination. Slash-and-burn and other unsustainable methods of subsistence farming are practiced in some lesser developed areas.

In India, at present forest areas cover about 76.5 million hectares of land, which is about 23 per cent of the total geographical area. It ranges from about 87 per cent in Andaman & Nicobar Islands to only about 4 percent in Haryana making to range difference of 83 percent. According to our National Forest Policy, 33% of the total geographical area of the country should be under the forest cover to maintain ecological balance. Unfortunately, it is below the norm outlined in our forest policy. The vegetation found in India can be divided into six main types. They are tropical evergreen forests, tropical deciduous forests, thorn forests, tidal forests and mountain forests.

Tropical Evergreen forests grow in the high rainfall areas of the Western Ghats, North –eastern India and the Andaman and Nicobar Islands. These forests grow in areas where the monsoon period lasts for several months.

Deciduous forests are found in regions with a moderate amount of seasonal rainfall that lasts for only a few months. Most of the forests in which Teak trees grow are of this type. The deciduous trees shed their leaves during the winter and hot summer months.

Dry tropical thorn forest occurs in areas of low rainfall. Forest types are saprophytic in nature. Trees are shorter than deciduous type. These forests mostly occur in the scanty rainfall region of Rajasthan, Punjab and Haryana. Most of the species are ‘acacia’ type.

Tidal Forests grow along the coast especially in the river deltas. These plants are uniquely adapted to be able to grow in a mix of saline and freshwater. They grow luxuriantly in muddy areas covered with silt that the rivers have brought down. The mangrove trees have breathing roots that emerge from the mud banks.

Conservation of Biodiversity and Wildlife

Biodiversity, or biological diversity, is the variety of all life forms.Sum total of all the variety of living organisms on earth constitute biodiversity. There are three levels of biodiversity:

• genetic diversity—the variety of genetic information contained in individual plants, animals and micro-organisms
• species diversity—the variety of species
• ecosystem diversity—the variety of habitats, ecological communities and ecological processes.

Biodiversity is not static; it is constantly changing. It can be increased by genetic change and evolutionary processes, and it can be reduced by threats which lead to population decline and extinction.

Biodiversity is not uniformly distributed across the geographical regions of the earth. Certain regions of the world are very rich in biodiversity. We call such areas as “mega diversity zones”. We also refer to them as “hot-spots”. For example, India accounts for only 2.4 % of the land area of the world; but it contributes approximately 8% species to the global diversity due to existence of such pockets.

Humans depend for their sustenance, health, well being and cultural growth on nature. Biotic resources provide food, fruit, seed, fodder, medicines and a host of other goods and services. Importance of Biodiversity is due to:-

• Food, fibre, medicines, fuel wood and ornamental plants
• Protection of water resources
• Soil protection
• Breeding material for crop improvement
• Nutrient storage and cycling
• Pollution reduction
• Climate stability
• Maintenance of ecological processes

Causes of Loss of Biodiversity:-

• Direct ways: Deforestation, hunting, poaching, commercial exploitation
•  Indirect ways: Loss or modification of the natural habitats, introduction of exotic species, pollution, etc.
•  Natural causes – Climate change.

International efforts for biodiversity conservation:-

• Convention on Biological Diversity :-The objectives of the CBD are the conservation of biological diversity, the sustainable use of its components, and the fair and equitable sharing of the benefits arising from commercial and other utilization of genetic resources. The agreement covers all ecosystems, species, and genetic resources.
  CITES Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES)
  The CITES aims to ensure that international trade in specimens of wild animals and plants does not threaten their survival. Through its three appendices, the Convention accords varying degrees of protection to more than 30,000 plant and animal species.
• CMS Convention on the Conservation of Migratory Species of Wild Animals :-The CMS, or the Bonn Convention aims to conserve terrestrial, marine and avian migratory species throughout their range. Parties to the CMS work together to conserve migratory species and their habitats by providing strict protection for the most endangered migratory species, by concluding regional multilateral agreements for the conservation and management of specific species or categories of species, and by undertaking co-operative research and conservation activities.
• International Treaty on Plant Genetic Resources for Food and Agriculture :-The objectives of the Treaty are the conservation and sustainable use of plant genetic resources for food and agriculture and the fair and equitable sharing of the benefits arising out of their use, in harmony with the Convention on Biological Diversity, for sustainable agriculture and food security. The Treaty covers all plant genetic resources for food and agriculture, while its Multilateral System of Access and Benefit-sharing covers a specific list of 64 crops and forages. The Treaty also includes provisions on Farmers’ Rights.
• Ramsar Convention on Wetlands (popularly known as the Ramsar Convention) :-The Ramsar Convention provides the framework for national action and international cooperation for the conservation and wise use of wetlands and their resources. The convention covers all aspects of wetland conservation and wise use, recognizing wetlands as ecosystems that are extremely important for biodiversity conservation in general and for the well-being of human communities.
• WHC World Heritage Convention (WHC) :-The primary mission of the WHC is to identify and conserve the world’s cultural and natural heritage, by drawing up a list of sites whose outstanding values should be preserved for all humanity and to ensure their protection through a closer co-operation among nations.
• IPPC International Plant Protection Convention (IPPC) :-The IPPC aims to protect world plant resources, including cultivated and wild plants by preventing the introduction and spread of plant pests and promoting the appropriate measures for their control. The convention provides the mechanisms to develop the International Standards for Phytosanitary Measures (ISPMs), and to help countries to implement the ISPMs and the other obligations under the IPPC, by facilitating the national capacity development, national reporting and dispute settlement.
  The Secretariat of the IPPC is hosted by the Food and Agriculture Organization of the United Nations (FAO).

There are several strategies which are adapted for conservation of Biodiversity. Some of these are:

Legislation Formal policies and programmes for conservation and sustainable utilisation of biodiversity resources dates back to several decades. The concept of environmental protection is enshrined in the Indian constitution in articles 48a and 51a(g). Major central acts relevant to biodiversity include:
• Environment Protection Act, 1986
• Fisheries Act, 1897
• Forest Act, 1927
• Forest (Conservation) Act, 1980
• Wildlife (Protection) Act 1972 and Wildlife (Protection) Amendment Act 1991

In-situ Conservation Conserving the animals and plants in their natural habitats is known as in situ conservation. The established natural habitats are:
• National parks and sanctuaries
• Biosphere reserves
• Nature reserves
• Reserved and protected forests
• Preservation plots
• Reserved forests

Ex-situ Conservation like Boatanical and Zoological parks
Recording Indigenous Knowledge
Community Participation in Biodiversity Conservation

According to FAO Food Security  is “a situation in which all people at all times have access to adequate quantities of safe and nutritious food to lead a healthy and active life”.

This definition requires three basic conditions to be met:

1) adequacy, i.e. supplies from domestic production, stocks and imports are sufficient to meet the nation’s needs,

2) availability i.e. stability of supply both spatially and temporally throughout the year and

3) access, i.e. the population has sufficient purchasing power to gain access to its food needs.

India is one of the few countries which have experimented with a broad spectrum of programmes for improving food security. It has already made substantial progress in terms of overcoming transient food insecurity by giving priority to self-sufficiency in foodgrains and through procurement and public distribution of foodgrains, employment programmes, etc. However, despite a significant reduction in the incidence of poverty chronic food insecurity persists in a large proportion of India’s population.

The range of adverse events, including reduced freshwater availability and more frequent extreme weather events, will considerably increase the risks for more efficient crop production and livestock management. Climate change is also likely to affect soil quality by depleting organic matter – a major contributor to soil fertility. In extreme cases, the degradation of the agricultural ecosystems could mean desertification, resulting in a total loss of the productive capacity of the land in question.

Food security is a multidimensional concept covering even the  micro level household food security,energy intakes and indicators of malnutrition.

Major components of food security are:-

1. Production and Procurement
2. Storage
3. Distribution

Indian Agriculture is rightly called as a gamble with Monsoon, variability in food production and rising population creates food insecurity in the nation and worst effected are the downtrodden section of the society.

While India has seen impressive economic growth in recent years, the country still struggles with widespread poverty and hunger. India’s poor population amounts to more than 300 million people, with almost 30 percent of India’s rural population living in poverty. The good news is, poverty has been on the decline in recent years. According to official government of India estimates, poverty declined from 37.2% in 2004-05 to 29.8% in 2009-10.

Need for Self-Sufficiency:

India suffered two very severe droughts in 1965 and 1966. Food Aid to India was restricted to a monthly basis by USA under the P.L. 480 programme.  The Green Revolution made a significant change in the scene. India achieved self-sufficiency in food grains by the year 1976 through the implementation of the seed- water-fertilizer policy adopted by the Government of India.

Food grain production increased four-fold during 1950-51 and 2001-2002 from 51 million tons to 212 million tones. The country is no longer exposed to real famines. But the regional variation in the success of Green Revolution which was chiefly limited to northern- Western states has lead to the divide in the nation. Evergreen revoloution and Bringing green revolution to eastern India is the need of the hour.

Green revolution was focused on wheat and rice and thus the production of pulses was stagnant.

National Food Security Mission comprising rice, wheat and pulses to increase the production of rice by 10 million tons, wheat by 8 million tons and pulses by 2 million tons by the end of the Eleventh Plan (2011-12). The Mission is being continued during 12th Five Year Plan with new targets of additional production of food grains of 25 million tons of food grains comprising of 10 million tons rice, 8 million tons of wheat, 4 million tons of pulses and 3 million tons of coarse cereals by the end of 12th Five Year Plan.
The National Food Security Mission (NFSM) during the 12th Five Year Plan will have five components

(i) NFSM- Rice;

(ii) NFSM-Wheat;

(iii) NFSM-Pulses,

(iv) NFSM-Coarse cereals and

(v) NFSM-Commercial Crops.

Government through Public Distribution System has tried to counter the problem of food insecurity by providing the food grains through fair price shops.

The central Government through Food Corporation of India has assumed the responsibilities of  procurement,storage,transfer and bulk allocation of food grains to state governments.

The public distribution system (PDS) has played an important role in attaining higher levels of the household food security and completely eliminating the threats of famines from the face of the country, it will be in the fitness of things that its evolution, working and efficacy are examined in some details.

PDS was initiated as a deliberate social policy of the government with the objectives of:

1. i) Providing foodgrains and other essential items to vulnerable sections of the society at resonable (subsidised) prices;
2. ii) to have a moderating influence on the open market prices of cereals, the distribution of which constitutes a fairly big share of the total marketable surplus; and

iii) to attempt socialisation in the matter of distribution of essential commodities.

The focus of the Targeted Public Distribution System (TPDS) is on “poor in all areas” and TPDS involves issue of     35 Kg of food grains per family per month for the population Below Poverty Line (BPL) at specially subsidized prices. The TPDS requires the states to Formulate and implement :-

1. foolproof arrangements for identification of poor,
2. Effective delivery of food grains to Fair Price Shops (FPSs)

Its distribution in a transparent and accountable manner at the FPS level

The Green Revolution was initiated in the 1960’s to address the issue of malnutrition in the developing world. The technology of the Green Revolution involved bio-engineered seeds that worked in conjunction with chemical fertilizers and heavy irrigation to increase crop yields.

Green Revolution was largely confined in wheat crop and in northern India such as Punjab, resulting in a limited contribution to overall economic development of the country. On the contrary, the agricultural growth in the 1980s (the second wave of the Green Revolution) involved almost all the crops including rice and covered the whole country, it enabled to raise rural income and alleviate rural poverty substantially. Such a rise of rural India as a “market‟ for non-agricultural products and services was an important pre-requisite for the rapid economic growth based on non-agricultural sectors‟ development in India after the 1990s.

Green Revolution is based on:-

(i) improved seeds of high yielding varieties,
(ii) adequate and assured supply of water for irrigation, and
(iii) increased and appropriate application of chemical fertilizers for increasing agricultural production.

India has failed to extend the concept of high-yield value seeds to all crops or all regions. In terms of crops, it remain largely confined to foodgrains only, not to all kinds of agricultural produce. In regional terms, only Punjab and Haryana states showed the best results of the Green Revolution. The eastern plains of the River Ganges in West Bengal state also showed reasonably good results. But results were less impressive in other parts of India. Those states which were originally rich derived the benefits of Green Revolution, e.g., Punjab, Haryana and Western U.P. As the benefits of new technology concentrated mainly in these areas, other Indian states could not match them.

The word “monsoon” comes from the Arabic word mausim, meaning season.Monsoons refer to a system of winds in the tropical regions under which the direction of winds is reversed completely between the summer and the winter seasons. Under this system, the winds blow from land to sea in winter and from sea to land in summer. Therefore, most of the rainfall in the regions influenced by the monsoons is received in the summer season while winter season is generally dry.

Due to a higher temperature over the land in summer, a low pressure area develops over the continents and the winds blow from neighbouring oceans towards the land. These winds are of maritime origin and hence cause ample rainfall in summer. On the other hand, the continents become colder than the neighboring oceans in winter. As a result a high pressure area is developed
over the continents. Therefore, winds blow from land to sea in winter. These winds, being of continental origin, are dry and do not cause rain.

Role of Jet streams, Tibet Plateau and atmosphere-ocean circulation is of prime importance for the origin of Indian Monsoon.During this summer season the vertical sun rays at tropic of cancer ,the circum polar whirl along with westerly jet stream weakened and shifted northward of the Himalayas and southern branch of this jet stream disappeared by 6-10 June. This removal of westerly jet stream to the north of Tibet plateau leads to reversal of curvature of flow of free air to the north and northwest of the subcontinent. It further leads to development of dynamic depression overlying the thermal depression already established at the surface of northwest Indian subcontinent which ultimately help to trigger the burst of Indian monsoon along with it vigorous advance over the Indian subcontinent.

As long as the position of upper air jet stream is maintained above the surface low pressure to the south of the Himalayas the dynamic anticyclonic conditions persist in the northwestern part of Indian subcontinent which obstruct the ascent of air from the surface low as the air is continuously descending from the above. This is the reason why the months of April, May and June are dry inspite of high temperature and evaporation while upper air low pressure in the east of the Himalayas over Myanmar, Assam and Bangladesh helps in ascend of air and produce rainfall.

During October and November, the high pressure over northern lndia, the winds start blowing from northeast as retreating monsoons. Clear skies and the increase in mercury northern plains is observed which is termed as ‘October heat’. At this time, the low pressure conditions shift to the Bay of Bengal giving rise to cyclonic depressions. These cyclonic depressions often results in the destruction of life and property generally on the eastern coast and the southern coast. Most of the rainfall of the Coromandel Coast is derived from depressions and cyclones.

Drainage: Flow of water through well-defined channels. Network of such channels is called a drainage system .

Drainage basin: An area drained by a river and its tributaries.

Watershed: Boundary line separating one drainage basin from other.

River basins are larger watersheds.

Drainage pattern of an area depends on the geological time period, nature and structure of rocks, topography, rocks, slope, amount of water and periodicity of flow.

Important drainage patterns:

1. Dendritic: Resembling the branches of a tree. Eg. Northern Plain rivers
2. Radial: Originate from a hill and flow in all directions. Eg. Rivers in Amarkantak
3. Trellis: Primary tributaries parallel to each other and secondary tributaries join them at right angles.
4. Centripetal: Rivers discharge waters from all directions in a lake or depression

A river drains the water collected from a specific area, which is called its catchment area.

Nearly 77 pc of drainage is towards the Bay of Bengal while about 23 pc is towards the Arabian Sea.

The Himalayan Drainage System

Mainly includes the Ganga, Indus and Brahmaputra river basins.

Over the plains, rivers of this system change the course often. River Kosi is also known as the ‘sorrow of Bihar’ due to flooding by its frequent change of course by deposition of sediments.

Evolution

Geologists believe that a mighty river called Shivalik or Indo-Brahma traversed the entire length of the Himalayas some 5-24 million years ago. Over time this got dismembered into the present three major river systems.

The Indus System

Indus river originates from a glacier near Bokhar Chu in Tibet in the Kailash Mountain range. Known as Singi Khamban (Lion’s mouth) in Tibet. It forms a spectacular gorge near Gilgit in J&K. Enters Pakistan near Chillar in the Dardistan region. Flows only through the Leh distt of J&K.

Smaller tributaries: Shyok, Gilgit, Zaskar, Nubra, Hunza, Shigar, Gasting, Dras. On right bank: Kabul river, Khurram, Tochi, Gomal, Viboa and hte Sangar.

Major tributaries: Satluj, Beas, Ravi, Chenab, Jhelum

The Ganga System

It is the largest river system in India.

Ganga rises in the Gangotri glacier near Gaumukh in the Uttarkashi district. Here it is known as the Bhagirathi. At Devprayag, Bhagirathi meets Alaknanda and is known as Ganga hereafter.

Panchprayag

Ganga enters the plains at Haridwar.

Left Bank tributaries (LBT): Ramganga, Gomati, Ghaghara, Gandak, Kosi and Mahananda.

Right Bank tributaries (RBT): Son

Discharges into Bay of Bengal near Sagar island.