1. Introduction to Soil Microbiology;Alexander,1978
2. Nitrogen losses from urine-affected areas of New Zealand pasture, under contrasting seasonal conditions;Ball,1983
3. Soil Nutrient Bioavailability – A Mechanistic Approach;Barber,1984
4. An automated method for determining nitrate-N in soil extracts;Best;Qld. Agric. J.,1976
5. Total nitrogen;Bremner,1996