Scientific American, Volum 235Munn & Company, 1976 |
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Side 181
... varieties of crop plants . A first impera- tive is the development of varieties that produce abundantly when they are grown in dense plantings and are sup- plied with fertilizer , water and pesti- cides . The plants can also be given ...
... varieties of crop plants . A first impera- tive is the development of varieties that produce abundantly when they are grown in dense plantings and are sup- plied with fertilizer , water and pesti- cides . The plants can also be given ...
Side 184
varieties ; without it they do no better than the traditional types , and they may do worse . Although some of the ... varieties and North American semidwarf wheats . The dwarf genes in the American types were derived in turn from a ...
varieties ; without it they do no better than the traditional types , and they may do worse . Although some of the ... varieties and North American semidwarf wheats . The dwarf genes in the American types were derived in turn from a ...
Side 186
... varieties . Because of the earlier maturity some farmers can grow two crops a year or even three . Other characteristics that are shared by some or all of the new rice varieties include insen- sitivity to photoperiod ( the number of ...
... varieties . Because of the earlier maturity some farmers can grow two crops a year or even three . Other characteristics that are shared by some or all of the new rice varieties include insen- sitivity to photoperiod ( the number of ...
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