Ecology: Nitrogen Oxide Pollution May Spark Seeds' Growth
Two ecologists have learned that the seeds of a common California wildflower can be prompted to germinate by exposure to nitrogen oxides, gases produced by both natural wildfires and motor vehicles and power plants. The finding, reported on page ::: 1248, helps explain why the flower springs up so quickly after brush fires. It also raises a provocative question: Could nitrogen oxides in air pollution be fooling the seeds of this and other fire-adapted plants into germinating when conditions are deadly to the seedlings?
Adopt optimum compound design to study the regression relation of hybrid maize yield, relating to density ,quantity applied of feirtilizer-N、 fertilizer-P_2O_5、 fertilizer-K_2O Regression model was set and the optimum cultivation technique was obtained by the aid of computer statistics.