Perhaps you should try some spelling variations:
fertilizer trials » fertilizer materials, fertilizer prices, fertilizer crisis
technical experts » technical expertise
fertilizer usage » fertilizer use, fertiliser use, fertilizer type
assessment ecm » assessment e6, assessment el, assessment esw
ecm technical » esw technical, ets technical, eaap technical

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: from ((fertilizer trials) or (fertilizer usage)) assessment ecm technical experts.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: from ((fertilizer trials) OR (fertilizer usage)) assessment ecm technical experts..
• Adding a wildcard symbol may retrieve word variants: from ((fertilizer trials) or (fertilizer usage)) assessment ecm technical experts.*.