1. oysters: 250 mg S and 61 mg Zn /100g

2. beef: 240 mg S and 11 mg Zn /100g

http://apjcn.nhri.org.tw/server/info/books-phds/books/foodfacts/html/data/data5g.html

https://www.myfooddata.com/articles/high-zinc-foods.php

It is inherent in your statement that the elements are essential: without them plants will not grow at all, with insufficient amounts they will not grow as well as those adequately supplied (tautological, but that is the point of the definition), so to put it somewhat facetiously: all foods will contain S and Zn to some degree.

If you are looking for typical concentrations of S and Zn in foodstuffs, I suggest you look up some of the databases provided by the WHO or FAO:

WHO | Micronutrients database www.fao.org/infoods/infoods/tables-and-databases/faoinfoods-databases/en/

INFOODS: FAO/INFOODS Databases www.who.int/vmnis/database/en

What are the natural sources of sulphur (S) and zinc (Zn)?

Question…

Your question addresses the primary source in what lies underneath the soil and the weathering mantle which gradually passes into the lowermost horizons of the soil and not the intermediate disposals already bearing organic matter.

Plants grow on the topsoil which has been derived from the decomposition of the parent lithology in the course of chemical weathering and organic processes leading in the topsoil to as much as 300 ppm Zn. There are Zn sulfides like sphalerite but they are too sporadic to provide sufficient Zn for the plants to grow. Bivalent Zn accommodates for bivalent Fe and Mg in mafic minerals such as olivine, pyroxene, amphibole and biotite, arranged in order of increasing stability during supergene alteration. As being altered Zn is released into the meteoric waters.

Sulfur is not incorporated into the common rock-forming silicates but contained under reducing conditions in the ubiquitous Fe sulfides pyrite and marcasite which show the maximum content excluding native sulfur. Under oxidizing condition S is taken up to build Ca sulfates such as gypsum and anhydrite.

So, based upon your pedological experience about the soil type and the lithological substrate you might predict where and how much of the S and Zn has come from the various parts of the substrate.

H.G.Dill

Most sulfur in the soil is located in the organic matter and cannot be taken up by the plant until mineralization, which is when sulfur is converted to sulfate, or SO4-2, by bacteria in the soil. is not found in its pure elemental form, but is found in minerals in the Earth's crust where it is about the 24th most abundant element. Small traces of zinc can be found in ocean water and the air. Minerals that are mined for zinc include sphalerite, smithsonite, hemimorphite, and wurtzite.

Sulfur is the third most abundant mineral in the body and is essential for many therapeutic uses, so make sure your diet includes foods rich in sulfur, Sulfur is found in many animal and plant foods, Vegetables: garlic, onions, Legumes: like chickpeas, Meat, and seafood, Dairy products. As for zinc, it is found in red meat, Legumes, Eggs, nuts, dark chocolate, dairy products