eChapters

In vitro cloning is a vegetative propagation performed in the Plant Tissue Culture system. In vitro micropropagation cloning propagation is mostly applied to the vegetatively propagated plants and in particular in ornamental, fruit and in a few orchard crops and in vegetable crops besides in many forest tree species.

Micrografting is a method to produce virus free, viroid free and disease free grafts that are clonally propagated. This method is an aid to mass multiplication. In vitro grafting is applied to difficult to root clones. Micrografting is performed to understand incompatibility prediction between the two grafting partners, virus indexing, deduction of latent virus, safe germplasm exchange and to do grafting functions throughout the year. It is not season specific. Protocols for micrografting are available for almond, pistachia, olive, prunus, grape, mulberry, cashew, citrus, peach, pear, avocado, hazlenut, walnut, chestnut and grape fruit (Hussein et al., 2014).

Clonal crops belong to at least 34 families including herbs, shrubs, trees and vines. Clonal crop improvement dates back to 10,000 years ago. The diversity of clonal crops and their wild relatives are very significant but not yet fully understood and exploited. Many crops represent combination of sexual and clonal reproduction. Different parts of the clonal crops which may or may not be the same as consumed parts have been shaped as clonal propagules such as stem, setts, tuber, rhizome, corms and bulbs among others.

Genetic purity is the vital determinant in continuing the genetic integrity in seed from generation to generation. This is the basis of variety purity maintenance. The genetic purity depends upon the purity of the seeds planted. The genetic purity of the seeds planted must exceed or equal to the final product purity standards required as the purity generally decreases with subsequent generations of propagation. The improved varieties loose their identity and healthiness unless properly maintained. Maintenance selection can prevent the seed quality deterioration.

1. Seed is the key ingredient in establishment and expansion, diversification and improvement of crops/and crop husbandry.

2. Seed is the most effective and efficient means of crop propagation.

India had fourfold increase in population from 0.3 billion to 1.34 billion and registered a fivefold increase in food grain production from 50 million tons to
285 million tons in 2018 (Paroda, 2020). 

Intercropping with food crops and vegetables is widely practiced by small and marginal farmers of the world mainly belonging to arid and semi-arid regions. Because of several benefits obtained, farmers prefer to adopt intercropping system. In temperate regions, mixed stands of cover crops and combinations of cereal and legumes forage production are very common.

Enhancement of population is a global issue and the expected world population will be 9.7 billion in 2050 (UN, 2019). Under the situation, achievement of food and nutritional security is a major target with reduction of GHGs to the atmosphere and mitigation of ill effects of climate change. Modern agriculture is responsible for emission of GHGs in many ways and one of them is production of synthetic N fertilizer. There is no doubt about the fact that chemical N fertilizers enhance crop yield but it is at the cost of atmospheric equilibrium and agricultural sustainability cannot be achieved by this practice (Bedoussac et al. 2015; Layek et al., 2018).

In the current situation, crop intensification is of topmost importance to increase agricultural production from ever-limiting and degrading resources. In this regard, the potential of agroforestry can be thought that offers ample opportunity to enhance farm output with multifaceted benefits (Xu et al., 2019). Forests are known to maintain ecological balance in many ways with greater ecosystem services; hence, the advantages of forestry can be included in agroecosystem in the form of agroforestry which enables yield of forest products and crops together

Worldwide, agriculture contributes a lot for mankind by providing food and feed for human beings and livestock, respectively. The countries where agriculture plays a vital role, it has enough importance in the economy of the country as well as gross domestic product (GDP).

Agriculture is an important factor for human civilization as it not only provides food, feed for the livestock, fibre, fuel and industrial raw material but also supports the livelihood of a wide range of world population. Besides, it shows its prominent presence in the economy of the developing countries. Being a developing country, agriculture is the largest sector in India where about 54% of the population is engaged. The growth of agriculture in India during last seven and half decades (after independence) is quite remarkable in terms of sufficient food-grains production as well as in achieving self-sufficiency in food production. The task to achieve it was not so easy.

During recent time, world agriculture is in search of sustainability in farming. However, it is tedious job for the developing countries because of poor input management and degradation of resources, ever-growing human population and increasing demand for food and livestock feed, and shrinkage of land and other natural resources.

Agriculture is the mainstay of the economy in different developing countries and it is not only nourishing the population, but also contributing a major share in country’s gross domestic product (GDP). During the second half of the twentieth century and after, modern agriculture encouraged intensive cropping with high cost and consumption of fossil-fuel based energy. Yield enhancement was achieved by adoption of modern technologies, but that was at the cost of ecological unbalance.

The competitive relations among the cultivated crop species perform a relation and these are pronounced during the early growth period of the crops and during later phases. The crop’s performance is reflected into the yield output. Intercropping research so far conducted is based on the experimental layout of either replacement or additive series.

Predominantly, an agrarian society is mostly dependent on the farm sector. Agriculture plays an important role in Indian economy notwithstanding its shrinkage in share in the gross domestic product (GDP) of the country being 55.4% in 1950-’51 and 17.4% in 2018-’19 (Tripathy, 2019). Still the agriculture and allied sector is providing employment to 54 percent of the Indian population.

Oats originated in the Mediterranean region and from there it spread to most of the countries of the world like U.S.A., Russia, Canada, Poland, Australia, France and Germany.

Maize is an ideal forage crop grown throughout the country. It is quick growing, high yielding and provides palatable and nutritious forage which can be fed at any stage of growth without any risk to animals. Maize produces good quality herbaceous fodder with high digestibility. On an average, it contains 9-10% crude protein, 60-64% neutral detergent fibre, 38-41% acid detergent fibre, 28-30% cellulose and 23-25% hemi cellulose on dry matter basis when harvested at milk to early-dough stage. It can be fed as green or dry and makes excellent silage.

Origin is generally accepted that the genetic/evolutionary origin of lucerne is in the near east center of Vavilof and that the species developed in Asia Minor, Iran and the highlands of Turkmenistan. All these areas have cold winters and hot dry summers. The soil is well drained with an approximately neutral pH and has subsoils with deposits of calcium (lime). Sinskaya, a Russian, asserts that lucerne originated in two areas and that there was a second development in central Asia.

They are short duration crops. Fodder is available for use in short period, e.g., cowpea and soybean can be harvested within 50-60 days of sowing. Being short duration crops, they can fit well in the gaps between two crops or seasons as catch crop.

It is a tufted aromatic perennial herb with fibrous roots, erect over 2 m tall, with smooth leaves and bearing a large inflorescence.

Origin: The origin of citronella is Sri Lanka