1. Correlation of soil tests with crop response to added fertilizers and with fertilizer requirement;Bray,1948
2. A comparison of analytical methods for soil zinc;Brown,1971
3. A rapid method of correlation of soil test analysis with plant response data;Cate;Int. Soil Test., Techn. Bull.,1965
4. Equilibrium relationships of Zn2+, Fe3+, Ca2+ and H+ with EDTA in soils;Lindsay,1969
5. Development of a DTPA-soil test for zinc, iron, manganese and copper;Lindsay;Soil Sci. Soc. Am. J.,1978