Answer: Blossom drop as you describe can affect plants where weather is rainy and cool or where soil moisture is low and winds are hot and dry. It can also occur when magnesium levels are low. Although you've obviously been feeding your plants well, perhaps the yellow variety would prefer less nitrogen. Too much nitrogen can result in lots of green growth, at the expense of fruit. And, excessive or rapid growth can result in weak fruiting stems. Why not try treating your yellow tomato a little differently than the others and see what happens? Keep the soil moisture level and hold off on fertilizer - for the time being, anyway. I suspect your plant will develop and hold fruit for you if you follow the above suggestions.
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