ISSN:
1435-0661
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Triticum aestivum L.)-fallow (WF) and wheat-corn (Zea mays L.)-fallow (WCF). Past N fertilizer applications were over four rates with total amounts applied during the previous 6 yr of ), 95, 190, and 286 kg N ha-1 in WF and 0, 134, 269, and 403 kg N ha-1 in WCF. Soils were an Aridic Paleustoll at Sterling and an Aridic argiustoll at Stratton in eastern Colorado. Total net N mineralization in WCF was half that in WF (22 vs. 43 kg N ha-1; 2-site average), probably due to greater immobilization as evidenced by nearly three times greater accumulation of crop residue on the soil surface after 6 yr of no-till management. Greater conservation of applied N and soil N can be expected in the more intensive WCF system. Total mineralized N increased with N rate by ≈ 0.2 kg N ha-1 for each kg N ha-1 of previously applied N. Precipitation in combination with air temperature and their interaction term gave the best prediction of average daily N mineralization at both sites.
Type of Medium:
Electronic Resource
Permalink
