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phosphorus
P fertilizer recommendations as a 2x to 18x multiple of MLSN
After I wrote this post about the differences in P fertilizer recommendations when using different methods for soil test interpretation, I heard from some readers that it seemed I was taking something simple—MLSN—and making it seem complicated.
Micah Woods
2022-10-16
1 min read
Fertilizer recommendations by three different methods: SPF, SLAN, and MLSN
Daniel Hahn and Romain Giraud wrote an article on LinkedIn about fertilisation decisions based on MLSN and STERF’s precision fertilisation (SPF). If you are at all interested in this topic, I hope you’ll read their article.
Micah Woods
2022-10-08
4 min read
A turfgrass tissue testing manifesto
Doug Soldat joined me for an ATC Office Hours discussion about leaf nutrient analyses (tissue testing) for turfgrass. I’ve embedded the video at the end of this post, link to it here, or listen to the podcast version here.
Micah Woods
2022-03-20
5 min read
Lack of response to a fertilizer application
These pots of variegated tropical carpetgrass (Axonopus compressus) received an application of granular 16-16-16 fertilizer twelve days before this photo was taken. The grass on the right responded with a lot more growth than did the grass at left.
Micah Woods
2021-08-03
2 min read
This is why you replicate
On February 28, 2020, I cut some Wana manilagrass rhizomes to a two node length and planted those two node rhizomes in four sand-filled pots. After eight days, I applied the first fertilizer treatment.
Micah Woods
2020-09-14
3 min read
Algae, sand, and phosphorus
On February 28, I planted ‘Wana’ manilagrass as two node rhizomes in sand-filled pots. All pots have had irrigation and rainfall. One pot has not been fertilized. One has received only N from urea.
Micah Woods
2020-05-10
2 min read
It is difficult to run a fertilizer down the field when the corn is six feet high
I was reading the “Cultural Aspects of Disease Management” chapter in Management of Turfgrass Diseases by Dr. Vargas and came across this gem about soil pH: “Most of the literature tells you that the soil pH should be maintained at the optimum level for turfgrass growth (between 6 and 7).
Micah Woods
2020-04-10
1 min read
Can you see the P?
The MLSN guideline for phosphorus (P) is 21 ppm. I usually recommend enough P fertilizer to keep soil P, as measured by the Mehlich 3 extractant, from dropping below 21 ppm.
Micah Woods
2019-12-21
2 min read
Phosphorus deficiency symptoms in the control plots
After last week’s post about the soil test levels where P deficiency symptoms were seen, Paul Johnson wrote to remind me about another experiment: “This is always a topic of interest to me, beginning with the study I did in the early 2000s.
Micah Woods
2017-07-31
5 min read
Can we guess how low the P is here
When I see a photo like the P deficiency one shared by Ben Pease (see photo below), I am really curious to know the soil test levels of the element.
Micah Woods
2017-07-26
2 min read
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