In:
Soil Science Society of America Journal, Wiley, Vol. 83, No. 4 ( 2019-07), p. 1137-1147
Abstract:
Nitrogen provided to crops through mineralization is an important factor in N management guidelines. Understanding of the interactive effects of soil and weather conditions on N mineralization needs to be improved. Relationships between anaerobic potentially mineralizable N (PMN an ) and soil and weather conditions were evaluated under the contrasting climates of eight US Midwestern states. Soil was sampled (0–30 cm) for PMN an analysis before pre‐plant N application (PP 0N ) and at the V5 development stage from the pre‐plant 0 (V5 0N ) and 180 kg N ha −1 (V5 180N ) rates and incubated for 7, 14, and 28 d. Even distribution of precipitation and warmer temperatures before soil sampling and greater soil organic matter (SOM) increased PMN an . Soil properties, including total C, SOM, and total N, had the strongest relationships with PMN an ( R 2 ≤ 0.40), followed by temperature ( R 2 ≤ 0.20) and precipitation ( R 2 ≤ 0.18) variables. The strength of the relationships between soil properties and PMN an from PP 0N , V5 0N , and V5 180N varied by ≤10%. Including soil and weather in the model greatly increased PMN an predictability ( R 2 ≤ 0.69), demonstrating the interactive effect of soil and weather on N mineralization at different times during the growing season regardless of N fertilization. Delayed soil sampling (V5 0N ) and sampling after fertilization (V5 180N ) reduced PMN an predictability. However, longer PMN an incubations improved PMN an predictability from both V5 soil samplings closer to the PMN an predictability from PP 0N , indicating the potential of PMN an from longer incubations to provide improved estimates of N mineralization when N fertilizer is applied. Core Ideas Relationships between mineralization estimates taken with the PMN an test and soil and weather conditions need to be improved. Soil sample timing and N fertilization minimally affected PMN an predictability by soil and weather parameters. Soil properties predict PMN an better than weather conditions. Soil and weather conditions combined explain up to 69% of the variability of PMN an . Longer PMN an incubations improve the relationship between soil and weather parameters and PMN an after N fertilization.
Type of Medium:
Online Resource
ISSN:
0361-5995
,
1435-0661
DOI:
10.2136/sssaj2019.02.0047
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
241415-6
detail.hit.zdb_id:
2239747-4
detail.hit.zdb_id:
196788-5
detail.hit.zdb_id:
1481691-X
SSG:
13
SSG:
21
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