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I've looked and looked for the cause of this

Posted by lungageorge none (My Page) on
Sun, Jun 8, 14 at 6:06

I've been trying to grow tomatoes in the Philippines in a small green house for four years. In each separate crop about 20% of my plants become stunted after about a month and the new leaves at the top become yellowish and sick looking. I've tried several different varieties and each one has some very nice plants and a few sick ones. The roots look great. No nematodes. No visible insects. Don't use herbicide. My soil ph is about 4.5, but the water I use has a ph of about 7.2. The ph of the wet soil is about 6. They get equal watering and fertilizer. What in the world is my problem?


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RE: I've looked and looked for the cause of this

Consider carryover herbicide in the organic matter.

See this
http://puyallup.wsu.edu/soilmgmt/Clopyralid.html

Same thing occurs several related herbicides used by farmers.

Here is a link that might be useful: clopyralid in compost


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