ScienceJohn Michels (Journalist) 1947 |
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Стр. 534
... production per acre of most of our principal crops over that obtained in the 1935-39 period can be readily attained ... production in increases by individual crops the world over , because acreage , yield , and production of many ...
... production per acre of most of our principal crops over that obtained in the 1935-39 period can be readily attained ... production in increases by individual crops the world over , because acreage , yield , and production of many ...
Стр. 536
... production , about 900,000,000 acres would be added for food production . To these potential cultivated new areas of red soils may be added a large area of uncultivated tropical soils found on the great islands of Sumatra , Borneo , New ...
... production , about 900,000,000 acres would be added for food production . To these potential cultivated new areas of red soils may be added a large area of uncultivated tropical soils found on the great islands of Sumatra , Borneo , New ...
Стр. 537
... production from all our three sources combined -present world cropland , 1,000,000,000 acres of new tropical , and 300,000,000 acres of extratropical soils- would exceed world food needs for all classes of food ex- TABLE 3 POTENTIAL ...
... production from all our three sources combined -present world cropland , 1,000,000,000 acres of new tropical , and 300,000,000 acres of extratropical soils- would exceed world food needs for all classes of food ex- TABLE 3 POTENTIAL ...
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