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Nitrogen is among the most crucial nutrients in developing a barley crop. Extra nitrogen leaching through soil is also a major contributor to groundwater pollution. Many factors and calculations are needed in balancing environmental issues from excessive nitrogen, with the need for enough oxygen to attain the harvest's highest potential yield. There has been extensive research done to discover the correct nitrogen program amounts by universities and private associations. Even with all this study there are still human choices and differing professional and lab opinions that make this decision complicated. Nitrogen is the foundation for the growth of a crop of barley which will generate a sufficient yield. Applying fertilizer to the crop requires careful and essential measures which will help determine the sum needed. Therefore step 1, when determining nitrogen needs for the next growing season, it is very important to discover how much nitrogen will be left in the soil in the previous rising year. This process requires a soil sample evaluation, which may provide test results revealing which kind of nutrients are still left in the ground. "Step two, nitrogen is mineralized in the soil and made available for plant growth during the following growing season. The issue is there is no test for this so, in Southern Idaho, farmers utilize an estimation of about forty-five pounds Lite" (Robertson and Stark). Measure three, when after crops like sugar beets, potatoes, and onionsthat have accelerated residue decomposition, farmers do not have to use extra recommendations, for nitrogen, to break down those preceding crop's residue. But should they have a crop which produces mature grain residue, which has low tissue nitrogen levels, farmers need to appl...