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Field experiments were conducted at three typical wheat–maize double-cropping sites in north and northwest China to investigate ammonia (NH 3 ) volatilization from urea and from urea amended with 0.12% (w/w) Limus ® (a new urease inhibitor consisting of 75% N-(n-butyl) thiophosphoric triamide (NBPT) and 25% N-(n-propyl) thiophosphoric triamide (NPPT)) in winter wheat. Grain yields...
Nitrogen dynamics and budgets in a clay loam soil (Meadow Aqualf) in the North China Plain were investigated in a winter wheat (Triticum aestivum L.) and maize (Zea mays L.) cropping system comparing the effects of four N rates (0, 120, 240 and 360kgNha -1 as urea) applied twice to each crop over 2 years. Ammonium nitrogen (NH 4 -N) in the soil profile remained at a low and constant...
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