Despite the exceedingly poor soils, this is an incredibly productive agricultural area. The reason is we know how to grow plants, despite there being virtually nothing in the soil. Micronutrient sprays we find to be cheap and effective, in a big way. I heartily recommend it to anyone needing such supplement. The majority of commercial grower and nurserymen here use it. If it were cheaper or more efficient to be amending the soils, they would be doing that. But it’s not. Soil amendment is very expensive in terms of human labor and sometimes raw material. Even the native plants (of which I have many) which are naturalized to local conditions, show very strong improvement on a regimen of KeyPlex.
The lushness and vigor I get from them is far beyond what I see in other local plantings. I find the spray, additionally, to be very cheap because I bought in commercial quantity, bringing the cost to about $5/year/monthly apps, and it is absorbed efficiently due to the urea and sticker-spreader I add to the mix. Considering the amount of money I *don’t* spend on pest control, due to the natural vigor and resistance of the plants, I feel I am *far* ahead on the costs, and have uncommonly nice looking plants as well.
Plants, in general, don’t need or can’t use human vitamins. Foliar feeding is inefficient. It is only used when you’ve forgotten to fertilise an expensive crop or you have an intractable soil problem. In a domestic garden, it is usually better (and cheaper) to improve the soil, or change to more suitable plants. The trace elements in KeyPlex most certainly do not need repeated application in a domestic garden. One application of deficient elements is enough for years. Get a soil test and IF you have a particular deficiency, then a single application of that element to the soil is all that is required and is also dirt cheap. What human vitamins are in KeyPlex? BTW, some farmers are renowned for following fads and fashions without proper testing. Just look at the bullshit they carry out in Biodynamic farming.