high yielding varieties hybrids

As a result of sustained research in agriculture, many high yielding varieties /hybrids have been released in our countries (India 2000). In rice, more than 600 high yielding, early maturing, dwarf disease resistant varieties..

As a result of sustained research in agriculture, many high yielding varieties /hybrids have been released in our countries (India 2000). In rice, more than 600 high yielding, early maturing, dwarf disease resistant varieties hav..

Most of the hybrid varieties of cereals have been evolved by this type of hybridization. The hybrid varieties thus evolved give good yield, are resistant to disease, are of better quality and have higher nutritive valu..

Hybridization - It is a breeding method, where in two known parents are crossed with the objective of achieving hybrid vigour or heterosis. Parents may belong two varieties of same species or two species of same gen..

Here the aim is to increase crop production. High yielding crops should be developed for this purpos..

. Use of commercial hybrids invariably involves inbred plants as parents -which means parental purity is maintained by not allowing pollen from other varieties to fertilize. The success of hybrid crop and its heterosis is much dependent on purity of parents. As against..

Two parents of known well defined characters belonging to two different species within a genus are crossed to achieve heterosis. Some important hybrids (both inter specific and intra specific) are listed ..

In this process, coal is heated in the absence of air to about 1273 - 1473 K. The major products of high temperature pyrolysis are, Coal..

Several disease, pest and drought resistant varieties of wheat, tomato, sugarcane have been evolved by this metho..

Breeding - Crop improvement by deliberate attempt to cross two parents of desirable characters to incorporate such characters in next generations is called breeding. The entire process of pollination, fertilization and regeneration is kept under control and selected parents are allowed to reproduce..