English Spinach and pumpkin leaves are pale, not green
Raised beds, gypsum dug into clay-based soil, Hortico Garden soil and 75 mm of dried cow manure is growing medium in the beds. Regular watering, soil is moist down to 300 mm. Shade cloth erected 1500 mm above garden for shade/heat protection (45 degrees here today!!!). Mineral deficiency?
Overall pale leaves is a classic sign of nitrogen deficiency; it could also be a pH problem which is making it hard for the plants to access minerals. https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/nitrogen-plant-fertilizer.htm
You can also call the nearest botanical garden for information about contacting a master gardener group, who will help you with analysis and treatment.