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Soil Testing as a Guide to Prudent Use of Nitrogen Fertilizers in Oklahoma Agriculture
Published in Deborah M. Fairchild, Ground Water Quality and Agricultural Practices, 2020
The crop nitrogen requirement can be easily calculated from yield and nitrogen content information. For example, for a 40 bushel/acre yield (60 pounds of grain per bushel) of wheat containing 13 percent protein (17.5 percent N in protein) the calculations would be as follows: Nitrogen requirement/acre = (40 bu/ac) (60 lbs/bu)(0.13 crude protein) (0.175 N/crude protein)Nitrogen requirement = 55 lbs N/ac
Profitability of irrigation and value of water in Oklahoma and Texas agriculture
Published in International Journal of Water Resources Development, 2018
Data for both statesData on non-irrigated harvested areas for each crop (acres), crop yield (bushels, bu), and irrigated crop price ($/bu) were obtained from the National Agricultural Statistics Service for 2009 (and 2008 in case of missing data points for 2009). Crop production volume for most of the crops is in bushels (1 US bushel = 35.2 L]. For yield, units were converted as follows: for irrigated an non-irrigated sorghum, the unit was converted from cwt (hundredweight) to bushels; for irrigated cotton, from pounds per acre to bushels per acre.Data and specifications for OklahomaCrop (enterprise) budgets from Oklahoma State University Extension Service were used.Specification of irrigation type was missing for all data sets in Oklahoma.Prices for non-irrigated crops are from the 2011 Oklahoma Comprehensive Water Plan (OWRB, 2011a, 2011b).Prices for irrigated crops and yield data are from the Oklahoma Dept. of Agriculture, Food, and Forestry (2015).For cotton, only cotton lint was included due to data paucity; no seed production was considered. Only upland cotton was included in the analysis.Data for TexasCrop budgets from Texas A&M AgriLife Extension Service were used.All data sets on irrigated crops represent sprinkler irrigation.For cotton, both cotton lint and cotton seed production were considered; as with Oklahoma, only upland cotton was included in the analysis.