Snow peas are planted in boxes 3 metres by half metre by half metre high soil and is mainly sheep manure (second year). Top two thirds of foliage very yellow.
Peas can turn yellow for a number of reasons. Some possibilities include too little water, nitrogen burn from the manure (though you would have seen that sooner, I think), root rot and high temps.
As long as the containers are draining well, I would try increasing water to the plants - this will help if it if it is too little water or high temps.
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