Concepedia

Diagnosis of S deficiency in soybean crops: Performance of S and N:S determinations in leaf, shoot and seed

Guillermo A. Divito, Hernán E. Echeverría, Fernando H. Andrade, Víctor O. Sadras

Field Crops Research · 2015 · 45 citations · 29 references

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Concepts

References

29

AN EXAMINATION OF THE DEGTJAREFF METHOD FOR DETERMINING SOIL ORGANIC MATTER, AND A PROPOSED MODIFICATION OF THE CHROMIC ACID TITRATION METHOD

Allan Walkley, I. ARMSTRONG BLACK · Soil Science · 1934 · 21.7K citations · Full text

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DETERMINATION OF TOTAL, ORGANIC, AND AVAILABLE FORMS OF PHOSPHORUS IN SOILS

R. H. Bray, L. T. Kurtz · Soil Science · 1945 · 7.7K citations

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Stages of soybean development

W. R. Fehr, C. E. Caviness · Iowa State University Digital Repository (Iowa State University) · 1977 · 2.5K citations · Full text

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Determination and Isotope‐Ratio Analysis of Different Forms of Nitrogen in Soils: 3. Exchangeable Ammonium, Nitrate, and Nitrite by Extraction‐Distillation Methods

J. M. Bremner, D. R. Keeney · Soil Science Society of America Journal · 1966 · 759 citations

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Sulphur in crop production — invited paper

Heinrich W. Scherer · European Journal of Agronomy · 2001 · 563 citations

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