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CROPLAND NITROGEN REQUIREMENTS The cropland, which can all be irrigated with liquid waste mixed with District water through pipelines,totals 510 acres. The acreage is rotated in silage corn and winter oats with the following nitrogen requirements: Corn silage=250 lbs N/Ac x 510 Ac= 127,500 lbs N required Oats= 140 lbs N/Ac x 510 Ac= 71.400 lbs N required TOTAL 198,900 lbs N required Therefore, a theoretical nitrogen deficit of 198,900 lbs - 150,188 lbs=48,712 lbs of N occurs on the cropland controlled by the Quaresma's if all solid manure is exported. If both solid and liquid nutrients are applied to the cropland there is still a theoretical nitrogen deficit of 198,900 lbs - 189,512 lbs =9,388 lbs of N IV. CONCLUSIONS AND RECOMMENDATIONS The data and information presented above provides an approximate estimate of what is occurring, and what is projected to occur at the facility with regard to nitrogen production, crop utilization and environmental stewardship. There are numerous factors involved in adequately assessing and correlating crop needs and uptake of available nitrogen. From the results of the nitrogen balance equations,the amount of liquid nitrogen produced by the future dairy operation is approximately 75% of the nitrogen needed for optimum crop growth, if all solids are exported. The nitrogen produced by the expanded facility balances with the nitrogen required if all liquid and solid manure is utilized. When large numbers are formulated to assess nitrogen produced vs. nitrogen required, the margin of error can be t10%. Therefore, it is recommended that sampling and analysis be performed on the following items before and during each crop: 1.)Nutrients in the form applied, 2.) Cropland soils and 3.) Tissue samples of the crops to check for N excess. By analyzing these different parameters, it can best be determined which form of nutrient(liquid, solid or possibly inorganic fertilizer)to apply to a particular field. Additionally, the Estimated Nitrogen Release (ENR) must be taken into consideration when determining nutrient application quantities. This quantifies potential nitrogen release from previous crop residues. The procedures for determining crop nutritional needs, particularly nitrogen, without overloading the cropland can be a complex process. In an effort to simplify the information required to make best management decisions for optimum crop growth and nutrient utilization, we recommend the Manure Analysis Reference Guide, published by A & L Agricultural Laboratories. It provides one of the best sources of information to determine utilization of crop nutrients from confined animal facilities. The suitable rate of solid and liquid applications is determined by the ability of Lthe soil and crop combination to immobilize and utilize the nutrients in the applied manure, which is detailed on the Worksheets found in this Guide. 10 7la!&ey Ag Research