tomatoes - Knowledgebase Question

Truro, Ma
Question by marget_hanso
June 30, 2010
some leaves are turning yellow using fish fert 5-1-1 every 2 wks, in good soil & all sun, have done Bonide Rot-Stop for blossom end rot. Last yr had tomato fruit worms Tomaotes not planted in that raised bed. Preventative???


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Answer from NGA
June 30, 2010

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Yellow leaves can be caused by many things including lack of nitrogen, insufficient light, water-logged soil (plant roots need oxygen to thrive), dry soil, or iron deficiency. If the older bottom leaves are yellow, but new growth is green, it's usually a lack of nitrogen. If new leaves are yellow, with green veins, it's usually a lack of iron. (Lack of nitrogen is a more common problem than lack of iron.) Soil should be kept moderately moist (but not wet). Transplant shock can contribute to yellowing. If new growth shows up as green, that might be the problem. Organic fertilizers are good for many reasons, although they can be slow acting. It may be that the nitrogen isn't yet available for absorption. Try to isolate each of these possibilities one at a time to determine if there's a problem. A few yellow leaves is okay, as plants will drop some older leaves to make way for new growth. Hope this info helps!

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