| Table | Card | RUSMARC | |
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Annotation
A necessity of radical improvement of environment conditions arises in several cases: 1. If the highly productive agricultural crop is cultivated which was obtained by selection from a plant originated in given native-climatic conditions. 2. If the plants are cultivated under conditions, which are not really optimum for them, for example, on soils which properties are far from those in an area of the origin of these plants.
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