Stimulation of barley growth and nutrient absorption by humic substances originating from various organic materials

A modified single solution method for the determination of phosphate in natural waters

J.E. Murphy, J.P. Riley · Analytica Chimica Acta · 1962 · 21.1K citations

Natural Sciences, Oceanography, Elemental Analysis +7

Determination of ammonium in Kjeldahl digests of crops by an automated procedure

W. M. Crooke, W. E. Simpson · Journal of the Science of Food and Agriculture · 1971 · 755 citations

Agriculture, Agronomy, Crop Sciences +3

Humic Substances in the Global Environment and Implications on Human Health

Warren A. Dick · Journal of Environmental Quality · 1995 · 686 citations · Full text

Natural Sciences, Environmental Sciences, Toxicology +16

Humic Substances in Soil and Crop Sciences

Soil Science · 1991 · 340 citations

Agriculture, Crop Sciences, Soil Sciences +14

Determination of Acidity in Soil Organic Matter

M. Schnitzer, Umesh Gupta · Soil Science Society of America Journal · 1965 · 286 citations

Agriculture, Chemistry, Soil Sciences +17