ScienceJohn Michels (Journalist) 1950 |
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Стр. 215
... phosphorus requirement , and in their ability to grow at different phosphorus levels . It is not surprising , therefore , that despite extensive research in this field there are many unsolved prob- lems . These problems interest the ...
... phosphorus requirement , and in their ability to grow at different phosphorus levels . It is not surprising , therefore , that despite extensive research in this field there are many unsolved prob- lems . These problems interest the ...
Стр. 216
... phosphorus deficiency was initially great . Conversely , the lowest return is in a region of moderate to high total phosphorus , content of the soil . Second , the use of phosphorus should be related to economic return from its use ...
... phosphorus deficiency was initially great . Conversely , the lowest return is in a region of moderate to high total phosphorus , content of the soil . Second , the use of phosphorus should be related to economic return from its use ...
Стр. 220
... phosphorus in the seedling stage more than cotton . Both appear less efficient than corn in using soil phosphorus . Influence of phosphorus fertility of soils on the utilization of fertilizer phosphorus . In an experi- ment with cotton ...
... phosphorus in the seedling stage more than cotton . Both appear less efficient than corn in using soil phosphorus . Influence of phosphorus fertility of soils on the utilization of fertilizer phosphorus . In an experi- ment with cotton ...
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