Worldwide, many agricultural soils are deficient in the nutrient zinc—despite the fact that farmers use fertilizers enriched ...

Many agricultural soils are deficient in the nutrient zinc despite the fact that farmers use fertilizers enriched with the ...

Ortho-Phosphate is analysed using a modification of the Bernhardt and Wilhelms [Bern67] method. Acidified ammonium molybdate is added to a seawater sample to produce phosphomolybdic acid, which is ...