Microplot design and plant and soil sample preparation for¹⁵nitrogen analysis

Chemical Compounds

• Fertilizer 78%
• Soil 54%
• Sample Preparation 53%
• Soil Sampling 39%
• Nitrogen Fertilizer 36%
• Sampling 35%
• Urea 33%
• Mass Balance 25%
• Stable Isotope 23%
• Time 15%
• Reaction Yield 8%

Medicine & Life Sciences

• Fertilizers 100%
• Soil 69%
• Zea mays 47%
• Urea 24%
• Isotopes 13%
• Nitrogen 12%
• Research Design 10%
• Research Personnel 8%
• Costs and Cost Analysis 8%

Engineering & Materials Science

• Fertilizers 65%
• Soils 50%
• Urea 31%
• Tracers 29%
• Nitrogen fertilizers 23%
• Sampling 17%
• Isotopes 15%
• Atoms 13%
• Contamination 12%
• Personnel 9%
• Planning 8%
• Costs 4%