The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 144
... natural varieties of plants and animals to produce characteristics that he desires - quality of produce , quantity of yield , time of ma- turing , etc. The same techniques make it possible to de- velop varieties that also exhibit ...
... natural varieties of plants and animals to produce characteristics that he desires - quality of produce , quantity of yield , time of ma- turing , etc. The same techniques make it possible to de- velop varieties that also exhibit ...
Page 148
... natural ene- mies . Systemic insecticides absorbed by the plant and translocated to the leaves are effective against plant feed- ers such as aphids , mites , and thrips but are not usually harmful to their natural enemies . The use of ...
... natural ene- mies . Systemic insecticides absorbed by the plant and translocated to the leaves are effective against plant feed- ers such as aphids , mites , and thrips but are not usually harmful to their natural enemies . The use of ...
Page 435
... natural " growth " of soil thickness ranges from one to ten millimetres per year . It shows that under the conditions of natural denudation , a well - regulated dynamic system exists . The three basic processes of the system - tectonic ...
... natural " growth " of soil thickness ranges from one to ten millimetres per year . It shows that under the conditions of natural denudation , a well - regulated dynamic system exists . The three basic processes of the system - tectonic ...
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activity America animals appear areas atoms became become body called camera century changes characteristics chemical Church colour common complete compounds consists containing continued drugs early effect electrons elements energy example existence experience Family field Figure fins fishes groups human important increase individual industry Italy known later lens less light liquid living lower major material means ment methods move movement natural North object occur organic original Peking Pentecostal percent period permafrost personality pest Peter petroleum Philip philosophy photographs plants political position possible practice present printing problems production Quakers range region result rocks similar social South species structure surface temperature theory tion United usually widely