Plants need more water in the heat, but not necessarily more food. Fresh water on a hot day is good for both the garden and the gardener.
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All of the N is in the nitrate (immediately available - water soluble) form. Soluble form of calcium.
Micronutrient values may show a zero value for missing data. Over time the dataset will improve, but keep in mind that in some instances; especially with natural materials, the listed values given are rough estimates and will vary with samples from different sources.