here is one link, you can do a search and see many oppinions and views

http://talk.newagtalk.com/forums/thread-view.asp?tid=169402&posts=26&highlight=AMS&h

quote

Posted 5/27/2010 04:54 (#1215361 - in reply to #1215207)
Subject: Re: building blocks of Plant Protein, Sulfate ? Quote Reply Alert Edit Delete


North Central Ohio, across the Corn belt ! http://www.hort.purdue.edu/rhodcv/hort640c/sulfate/su00005.htm


Do Adequate levels of Sulfate compliment N for the building of Plant protein ?

Looking at field data we started in the 70's ! and have carried forward

We continue to find that !
While reducing the quantity of N applications by app. 20% or so ? as we increase the applied S when growing grains, and achieving the same Yield and quality, Protein results ! from field trials we have done !!!

adequate K is also so very critical, and levels higher than the accepted norm may be necessary for plant health in High Production situations

This has been an interesting topic, debate for many years.

quote !

Synthesis of the sulfur amino acids: cysteine and methionine.

Wirtz M, Droux M.

Heidelberg Institute of Plant Sciences (HIP), University of Heidelberg, Im Neuenheimer Feld 360, 69120 Heidelberg, Germany. [email protected]
Abstract

This review will assess new features reported for the molecular and biochemical aspects of cysteine and methionine biosynthesis in Arabidopsis thaliana with regards to early published data from other taxa including crop plants and bacteria (Escherichia coli as a model). By contrast to bacteria and fungi, plant cells present a complex organization, in which the sulfur network takes place in multiple sites. Particularly, the impact of sulfur amino-acid biosynthesis compartmentalization will be addressed in respect to localization of sulfur reduction. To this end, the review will focus on regulation of sulfate reduction by synthesis of cysteine through the cysteine synthase complex and the synthesis of methionine and its derivatives. Finally, regulatory aspects of sulfur amino-acid biosynthesis will be explored with regards to interlacing processes such as photosynthesis, carbon and nitrogen assimilation.

PMID: 16307301 [PubMed - indexed for MEDLINE]