The uselessness of high P fertilizers
justaguy2
15 years ago
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gringojay
15 years agotapla (mid-Michigan, USDA z5b-6a)
15 years agoRelated Discussions
Anyone heard of Jack's Classic fert?
Comments (18)Whoa Ohiofem! What on earth??? I'm very aware of Al's incredible expertise and generosity, and thanked him profusely in a recent email. Why do you think I put the word "just" in quotation marks in my previous post? To make the point that using the word "just" when talking about Al's knowledge and experience is a bit of an oxymoron! I don't know why the defensiveness but I can assure you it's unwarranted. I never said I thought "some clerk in a garden center necessarily knows more than Al about the 'best' fertilizer;" where did you get that? I doubt there's a clerk in *any* garden center that knows more than Al. But the question they asked is legitimate, and I figured if I could get an answer then it would be a great opportunity to educate future employees I might encounter. I can think of two recent instances right off the bat where I educated "some clerk in a garden center" about an aspect of gardening. They were appreciative, and I felt good about being able to pass on something I had learned that was helpful to them. And just so you know, I can't count the number of times I've raved about GWF to other "plant people" - employees especially. Science as I was asking is not "just extensive knowledge and experience." It's also controlled experiments. I was simply asking whether there was hard science - i.e., controlled experiments - to back up what Al has learned and experienced for himself. If there is then it would seem to me a 5-1-2 ratio would get the best results, therefore that's what people would rave about, therefore that's what would sell the best, therefore that's what would be in companies' best interest. If no one has proven this scientifically then I'm just surprised. It seems like such a basic thing. As for there being a "best" fert. you seem to contradict yourself. On the one hand you say, "One reason I am so grateful to Al is that he has convinced me that all plants use essentially the same ratio of nutrients." In your last post you say "I don't know why you would think all fertilizer manufacturers or all scientists would agree on something as complex as what is the "best" fertilizer for all plants." So which is it: 3-1-2 or something much more complex? Not sure what your point is about having "tremendous respect for people like" scientists and Al - why would you not? Why would anyone not? BTW, altho I cringed when I picked it up off the shelf, I bought MG today because you suggested it. I have to get *something* on my plants and I haven't had time to order DG. At least I feel better than if I were using 10-10-10 or something comparable....See MoreIf the optimal fert ratio is 3-1-2...
Comments (15)The numbers like 9-3-6, 12-4-8 and 24-8-15 are the % by weight of N, P, and K respectively in the product. Those numbers are actually not too important, other than as a means by which you can determine the fertilizers RATIO, which is much more important and in this case would be 3:1:2. Note that the fertilizers %s are written with dashes between the numbers and the ratios with colons. Fertilizers like 20-20-20, 14-14-14, and 10-10-10 are all 1:1:1 ratios. Miracle grow makes 24-8-16 and 12-4-8. Both are 3:1:2 ratios. The instructions on the label will direct you to use half as much 24-8-16 as 12-4-8 (by weight), so in the end, you will be making a solution of the same strength. If you were comparing FP 9-3-6 to the 12-4-8, you'll find you're using about 1/3 more 9-3-6 as you would 12-4-8, and 2.75 more 9-3-6 as 24-8-16. IOW - when you're done mixing, if you followed the directions the solution strength will be very close for all soluble fertilizers. For granular slow release fertilizers (not controlled release), you would be directed on the package to use 50% more 10-10-10 per given volume as you would be directed to use 15-15-15; so again, the rate at which you fertilize would be exactly the same. It's not the numbers 9-3-6 that determines how close to being in the sweet spot FP is, it's the 3:1:2 ratio, and any other fertilizer with a 3:1:2 ratio would be its equal if all you consider is NPK content. I like FP because it supplies all the nutrients plants need from the soil at a ratio that hits dead in the center of the average of what all plants use. Plus, it doesn't get it's N from urea, which is a definite plus unless you're growing blueberries, in which case something with urea is desirable. Most CRFs supply individual nutrients somewhere in the 6-20% range. I don't know why, but suspect that with the weight of the coating and even using nutrients as concentrated as they can make them, it might be difficult to make the actual weight of all nutrients combined higher than 50-60% of the total weight of the product. Just a guess. Al...See MorePachira (Money Tree) Problems
Comments (49)Hi All, We purchased a money tree a year ago. It was doing great: fast growing, green, lush, and lots of enjoyment. Then, it seemed to be outgrowing its pot, and about two months ago I re-potted it. Now, I am getting yellow leaves (about 1 leaf turns yellow per day). The new growth (top canopy) after the re-pot is also very lime green and droopy. But, there was fast growth at first. I am so worried, I love this plant. I want to care for it before the poor leaves/whatever is wrong spreads. Any advice? Based on the literature, I think the roots are holding too much water. But, I am worried to re-pot into more porous soil, since I just re-potted. I've attached a few pictures to aid in our discussion....See MoreThe uselessness of high phosphorus levels
Comments (5)It has been shown that reducing nitrogen while maintaining other nutrient levels can initiate blooming, but I've never seen any evidence that excess phosphorus stimulates anything in plants. This seems to be a long held myth among growers. In the first link I provided, a fertilizer company's own CEO stated that their bloom booster formula is made because of consumer demand for it, not because of any scientific evidence of its usefulness. "...It is simpler to give the market what they think they need than to try to reeducate it." Of course people are free to use whatever they feel is best. I just like to see people looking at the evidence rather than looking at what others do. That's how myths get perpetuated....See Moregeorgeiii
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