proposed policy options in the Upper Waikato catchment. In the first phase nitrogen emissions are determined for representative …

The United States is the world's largest phosphate exporter and the world's largest potash importer. The U.s. nitrogen … trade balance, relatively stable before 1983, has shifted as the United States became a net importer of nitrogen beginning …, world and U.S. imports and exports of nitrogen, phosphate, and potash, and U.S. import origins and export destinations for …

benefits through a reduction in losses due to cold and an increase in yield from the better use of nitrogen by the cold …

-maximizing nitrogen rates, yields, and net returns for corn grown after corn, cotton, and soybeans. The stochastic response functions were … best. The profit-maximizing nitrogen rates were similar for corn after corn, cotton, and soybeans, but relative to corn …

maximum likelihood. Optimal levels of nitrogen were lower than recommended levels. …

Nitrogen is a crucial input for the efficient production of rice and is generally applied in two split treatments … is no pre-sowing test to estimate nitrogen requirements and farmers use cropping history to make this decision. The aim … of this study was to first value the information to growers provided by a nitrogen test for soils of rice paddocks and …

proposed policy options in the Upper Waikato catchment. In the first phase nitrogen emissions are determined for representative …