Predicting nitrogen mineralization from long term application of dairy manure in a semiarid cropping system

Leytem, A.B. and Rogers, C.W. and Dungan, R.S. (2023) Predicting nitrogen mineralization from long term application of dairy manure in a semiarid cropping system. Soil Science Society of America Journal. 88(1):71-88. 15 December 2023.

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Abstract

Approximately 37% of US milk production occurs in semiarid regions providing an opportunity to recycle manure nutrients through a variety of cropping systems. Accurate prediction of nitrogen (N) mineralization is critical to determine manure application suitability in intensive irrigated agriculture as many crops in the region have quality parameters that are sensitive to N. Research was conducted in south central Idaho to evaluate N mineralization via a buried bag methodology to develop a predictive N-mineralization model. The study was arranged in a randomized complete block design with manure application rates of 18, 36, and 52 Mg ha-1 both annually and biennially with synthetic fertilizer and untreated check treatments. The crop rotation included small-grain and broadleaf crops. Greater manure applications resulted in an increase in soil organic matter (SOM), total nitrogen (TN), and nitrate (NO3-N) at the culmination of the study. Nearly five-times as much N was mineralized annually in the 0 to 30 cm depth as compared to the 30 to 60 cm depth. Increased rates of mineralization for each kg of added N occurred in years when residue from broadleaf crops (slope = 0.17) was applied as compared to small-grain years (slope = 0.07). Stepwise modeling determined that the most predictive model for seasonal N mineralization (R2 = 0.79) included manure N, residue N, soil organic matter, and electrical conductivity. These results allow preplant N mineralization estimation and will prove critical for managing manure in semiarid regions for agronomic, economic, and environmentally sound crop production.

Item Type:	Article
NWISRL Publication Number:	1785
Subjects:	Manure Soil > Amendments Soil > Chemistry > Nitrogen Soil
Depositing User:	Users 11 not found.
Date Deposited:	09 May 2024 19:50
Last Modified:	09 May 2024 19:50
Item ID:	1828
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1828