how we will improve crop variety
Sampoornajana:
what
okay
yup
but i can't find you
here
Answers
Answered by
1
by mixed cropping and crop rotation
Answered by
1
Plant introduction usually means the introduction of the plants from places outside the county, may be of same or another continent. It can be defined as the “process of introducing plants from their growing locality to a new locality.”
The introduction of the genotypes from the place where it is grown to an entirely new area. It is the easiest or most common method of crop improvement.
Plant introduction may be of following types:
(ii) Intercontinental or Inter-countries plant introduction:
Introduction of plant material from another country within same continent, for e.g., Litchi and loquat from China.
(iii) Interstate plant introduction:
Introduction of plant material from another state within the same country, for e.g., N.P. wheat varieties from Delhi.
(iv) Intrastate or Inter-district plant introduction:
Introduction of plant material into different states within the country or from another district within the same state, for e.g., distribution of state recommended varieties of different crops from one district to another within the same state for general cultivation.
Any plant material therefore brought from another place may be within or outside the country, may be termed as introduced material or method of plant introduction. These introductions are also termed as exotic collection (EC, Introductions may be from outside the country) or indigenous collections (IC, Introduction may be from other parts or other states of the same country).
On the basis of nature, plant introduction is divided into two types:
Introduced plant is released directly for cultivation as a variety, for e.g., Introduction of Wheat varieties ‘Lerma Rojo’ and ‘Sonora 64’ in our country from Mexico in early 1960s; IR8 and Jaya varieties of rice.
Secondary introduction:
Introduced material is used for selection or for hybridization with the indigenous germplasm to bring about the desired improvement to make it suitable for cultivation for e.g., wheat variety ‘kalyan sona’ and ‘sonalika.’
Crop Improvement Method# 2. Acclimatization:
Acclimatization follows the introduction and both processes go side by side. Acclimatization is the adaptation or adjustment of an individual plant or a population of plants under the changed climate for a number of generations: Thus, it is a sort of natural selection operating into the introduced plant material.
Some important facts about the acclimatization are:
i. Genetic variability must be present in the introduced material for acclimatization to occur.
ii. Due to better genetic recombination, cross pollinated species have better acclimatization capacity than self-pollinated crops.
iii. Annual crop has better acclimatization capacity than perennial crop because in annuals each generation would produce new gene recombination every year.
iv. If the period of acclimatization is very long, the mutation also plays an important role in acclimatization.
The introduction of the genotypes from the place where it is grown to an entirely new area. It is the easiest or most common method of crop improvement.
Plant introduction may be of following types:
(ii) Intercontinental or Inter-countries plant introduction:
Introduction of plant material from another country within same continent, for e.g., Litchi and loquat from China.
(iii) Interstate plant introduction:
Introduction of plant material from another state within the same country, for e.g., N.P. wheat varieties from Delhi.
(iv) Intrastate or Inter-district plant introduction:
Introduction of plant material into different states within the country or from another district within the same state, for e.g., distribution of state recommended varieties of different crops from one district to another within the same state for general cultivation.
Any plant material therefore brought from another place may be within or outside the country, may be termed as introduced material or method of plant introduction. These introductions are also termed as exotic collection (EC, Introductions may be from outside the country) or indigenous collections (IC, Introduction may be from other parts or other states of the same country).
On the basis of nature, plant introduction is divided into two types:
Introduced plant is released directly for cultivation as a variety, for e.g., Introduction of Wheat varieties ‘Lerma Rojo’ and ‘Sonora 64’ in our country from Mexico in early 1960s; IR8 and Jaya varieties of rice.
Secondary introduction:
Introduced material is used for selection or for hybridization with the indigenous germplasm to bring about the desired improvement to make it suitable for cultivation for e.g., wheat variety ‘kalyan sona’ and ‘sonalika.’
Crop Improvement Method# 2. Acclimatization:
Acclimatization follows the introduction and both processes go side by side. Acclimatization is the adaptation or adjustment of an individual plant or a population of plants under the changed climate for a number of generations: Thus, it is a sort of natural selection operating into the introduced plant material.
Some important facts about the acclimatization are:
i. Genetic variability must be present in the introduced material for acclimatization to occur.
ii. Due to better genetic recombination, cross pollinated species have better acclimatization capacity than self-pollinated crops.
iii. Annual crop has better acclimatization capacity than perennial crop because in annuals each generation would produce new gene recombination every year.
iv. If the period of acclimatization is very long, the mutation also plays an important role in acclimatization.
Similar questions