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TABLE 5 % '. CUR NT°MILK�Ow POP[1 i.ATION :@ ETHEU1t1J+`TICAL 1V AxIN lI MSK GOVV POP JLATI;oN i- . ._ <.trST <..�S Ea D�E7 EE�El)CO � ,SCESTALLS � I:USH .,. , 200 Milk 550 Milk 200 Milk 800 Milk 0 Dry 60 Dry 0 Dry 100 Dry 200 Subtotal 610 Subtotal 200 Subtotal 900 Subtotal 810 TOTAL MILK COWS 1100 TOTAL MILK COWS �C In summary of the NIWMP, there is currently a theoretical nitrogen deficit of: 60,521 lbs. total Crop Nitrogen t minus 42,149 lbs. total pounds of liquid Nitrogen produced by the 0 dairy animals 18,372lbs: f N deficient. Therefore, 18,372 lbs. of synthetic nitrogen fertilizer are possibly nee rop supplement. This nitrogen mass balance is based on the premise that all solid manure is ex orte . If both solid and liquid nutrients were to be a lied to the 9 cropland there would be a theoretical nitrogen excess of 69,341 lbs. - 60,521 lbs = 8,820 lbs. of N. (POW- 5-,OA3 : �� 3rd The theoretical maximum milk cow population also proKces a theoretical nitrogen deficit of: 60,521 lbs. total Crop Nitrogen Requirement minus 54,000 lbs. total pounds of liquid Nitrogen produced by the maximum number of milk dairy animals = 6,521 lbs. of N deficient. Therefore, 6,521 lbs. of synthetic nitrogen fertilizer are possibly needed as a crop supplement. This nitrogen &Z Cow mass balance is also based on the premise that all solid manure is exported off-site. IV. CONCLUSIONS AND MONITORING RECOMMENDATIONS The data and information presented above provide an estimate of what is occurring, and what may be projected to occur at the Rocha Dairy 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. Currently, the results of the nitrogen mass balance equations indicate the amount of liquid nitrogen produced by the Dairy operation is approximately 70% of the nitrogen needed for optimum crop growth. When large numbers are formulated to assess nitrogen produced vs. nitrogen required, the margin of error canbe±10%. Therefore, it is recommended that sampling and analysis be performed on 1.)the soil for each field, 2.) holding pond water, 3.) Pescadero Reclamation District irrigation water, and 3.) the blend of both of these waters before and during the growth of each crop. This will provide an excellent monitoring tool to monitor, analyze, and make adjustments to the nutrient status of the soil, unlike monitoring wells which monitor "after-the-fact." Mr. Rocha has three options when.irrigating: He can apply holding pond water exclusively for fields that are deficient in nitrogen, he can apply a blend of District water and holding pond water to augment the soil nutritional status, or he can apply straight District water for soils or fields that are already high in nutritional status. 12 Chesney Consufting