The Encyclopedia Americana, Količina 1Alexander Hopkins McDannald Americana Corporation, 1949 |
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Stran 244
... crops . The growing of various crops in large tanks of prepared solutions of essential elements ( hydroponics , q.v. ) has been accomplished successfully by a few experimenters , but the economic value of this method of culture has yet ...
... crops . The growing of various crops in large tanks of prepared solutions of essential elements ( hydroponics , q.v. ) has been accomplished successfully by a few experimenters , but the economic value of this method of culture has yet ...
Stran 261
... crop in 1943 had a value of more than 550 million dollars . The aggregate value of principal crops in 1943 was about 131⁄2 billion dollars for the coun- try as a whole . This includes such other crops as sugar cane , sugar beets , grass ...
... crop in 1943 had a value of more than 550 million dollars . The aggregate value of principal crops in 1943 was about 131⁄2 billion dollars for the coun- try as a whole . This includes such other crops as sugar cane , sugar beets , grass ...
Stran 266
... cropping , and east to where there is enough moisture for more intensive crops . Wheat has always been a frontier crop , and in the develop- ment of United States agriculture , has steadily pushed west to these areas where it is grown ...
... cropping , and east to where there is enough moisture for more intensive crops . Wheat has always been a frontier crop , and in the develop- ment of United States agriculture , has steadily pushed west to these areas where it is grown ...
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