Show crops need use varied combination of ideas The most satisfactory way to tell Is a combination of several say Utah State University agricultural Pale green or yellowish color and stunted growth is an indication of lack of Soil tests show the amount of total nitrogen and the amount of available nitrogen at the time the sample is They don not indicate the ability of a soil to supply nitrogen throughout the growing Under continuous growing plants and micro-organisms use most of the nitrogen there is little of nitrogen under these conditions Under summer fallow a test for available nitrogen can be used as an aid in determining nitrogen needs A simple method for testing on the farm is to skip a strip in the field when applying nitrogen This strip will show what the yield would have been out extra On another strip make two trips with the spreader This doubles the application and shows whether heavier applications would have been better Rates of nitrogen fertilizer depend on nitrogen fertility already In the crop grown and yield Nitrogen fertility fas governed primarily by crop crop residues plowed green manure livestock manure organic and soil The yield expected will depend on climatic soil good desired plant irrigation and other phases of good One should apply just enough nitrogen so it will no longer be the factor restricting If poor irrigation practices are restricting nitrogen applications above this level of production are costly and on many crops will reduce quality If you can produce only sacks of potatoes due to some management factor other than don't fertilize for a yield of Quality of product will be damaged and your fertilizer dollar spent The fixed costs of growing an acre of for in the form of water and production labor are the exact same whether two tons are produced r five |