Soil Moisture And Temperature Effects On Nitrogen Mineralization In A High Tunnel Farming System
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS(2019)
摘要
Effects of temperature and moisture on nitrogen (N) mineralization from organic amendments in high tunnel farming systems are rarely studied to assist N fertilizer management for high N-demand crops with short cycles. In this study, soils from a new high tunnel site were incubated at four temperatures (2, 10, 20, & 30 degrees C) and five gravimetric water contents (15, 20, 25, 30, & 35%) with and without a dried and ground alfalfa amendment. Net N mineralization was determined by measuring NH4+-N and NO3--N contents periodically over 84 days. Significant main effects of temperature and moisture were found (p < .0001) and tendencies of a significance of alfalfa amendment (p = .0855) and interaction between amendment and temperature (p = .0842) were observed. Only a significant increase of the net mineralized N at 30oC in amended soil was observed compared to unamended soil (p = .0043). Estimated from the first-order exponential model, maximum potential mineralized N was 1.2 times greater while mineralization rate was up to 2.1 times greater in amended soil compare to un-amended soil. Q(10) estimated from the Arrhenius model ranged from 1.62 to 2.04 in the amended soil and 1.66 to1.85 in the un-amended soil. The average optimal soil water content for maximum N mineralization estimated from the Gaussian function model was 33.8% in amended soil and 35.9% in un-amended soil. The results from this study can be used to suggest soil moisture and temperature management strategies to control N availability in high tunnel systems.
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关键词
Alfalfa amendment, first-order exponential model, Arrhenius model, Gaussian function model
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