Humic acid fraction of a gray wooded soil as influenced by cropping systems and fertilizers

Multiple Range and Multiple F Tests

David B. Duncan · Biometrics · 1955 · 23.2K citations

Education, Educational Measurement, Standardized Testing +4

Soil Conditions and Plant Growth

Nature · 1915 · 1.6K citations · Full text

Agriculture, Plant Sciences, Soil Sciences +14

Micro-Kjeldahl Determination of Nitrogen.A New Indicator and An Improved Rapid Method

Ting Ma, G Zuazaga · Industrial & Engineering Chemistry Analytical Edition · 1942 · 682 citations

Natural Sciences, Chemistry, Analytical Chemistry +12

Soil Conditions and Plant Growth

E. WALTER RUSSELL · Soil Science · 1962 · 295 citations

Agriculture, Plant 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