Can someone diagnose my Flowering Plant leaves?

[goingrey]

They look pretty good all things considered. Some quite far along already, the others surely good to go down within the next two weeks as well. Ok, the peak of weight gain has passed, sure. Still the best use of time to make the most of it by keeping them happy for some more days, IMO.

 

[TanzanianMagic]

The symptoms started on the top leaves ( Light burn I guess) ppfd was at 1700 and above..

Lower leaves are doing alright.

I got an EC meter yesterday, and after flushing the plants for almost 2 weeks (saw no fade or yellowing of the leaves), I fed them at half the strenght.

EC is sitting at 1 now.

1.00 (i presume that's all nutrients) is a little low for flowering plants at this stage.

Also the EC of the water and whether it's tapwater or RO water is important.

Is the one affected plant a different strain or are they all the same strain?

It could be that this one plant just needs more calcium.

They're all affected, and the healthy plants seem to be in need of magnesium. The tips are affected first followed by the edges, the leaves are dark green, and some are canoeing/praying for magnesium.

You're doing very well and the plants can easily be rescued, however this is a grow in mid-flowering that still has weeks to go until the calyxes pop.

Looking at Mulder's Chart:

Source: https://www.canr.msu.edu/news/more_reasons_for_soil_testing

Both magnesium and calcium are locked out by potassium. Ca and Mg also can lock eachother out they're in the wrong ratio.

So another question is - what nutrients are being used?

 

[Dr.Dutch]

Looking at Mulder's Chart:

Forget the diagram for hydro. Bugbee explains it here in the last paragraph and the important information about antagonism and synergism is here:

3.3. Synergisms and Antagonisms among Nutrients​

Plant cells and solutions must have electroneutrality, which means that the concentration of cations and anions must be equal. This principle also means that the uptake of cations is associated with the uptake of anions, and vice versa. The principle is the underlying basis for most synergisms and antagonisms in nutrient uptake. Cation uptake inhibits the uptake of other cations, and anions inhibit anions. Conversely, cation uptake promotes the uptake of anions and vice versa.
The form of N uptake dominates synergisms. A high fraction of NH4+ inhibits other cations, especially Ca2+. Solutions with 100% N as NO3− tend to increase cation uptake, especially macronutrient cations like K+, Ca2+, and Mg2+.

In soilless substrates, these nutrient interactions are more complex as cations are absorbed and desorbed from the solid phase depending on pH, but these interactions are simplified in hydroponics where nutrients are uniformly distributed, and availability can be rigorously quantified.
One highly beneficial aspect of managing nutrients by mass balance is that ion concentration in solution is low and nutrient antagonisms are thus minimized. At higher concentrations, several nutrients are insoluble (ferric phosphate, calcium phosphates), and this precipitation reduces their bioavailability. Chapter 2 in Marschner [33] reviews the effects of the form of N uptake on other elements and reviews the literature on specific synergisms and antagonisms.

The “Mulders Chart”, also called the soil mineral wheel, is a commonly referenced diagram that includes lines connecting the nutrient elements that have proposed synergisms and antagonisms (https://www.n-xt.com/en/soil-health/limiting-minerals, accessed 7 June 2022). No physiological basis is given for the many connecting lines on the chart. Surprisingly, this chart does not separate the two forms of N, and it thus neglects some of the most significant nutrient interactions. It was developed from data for mineral soils, where interactions with the solid phase affected nutrient availability.

Source: https://www.mdpi.com/2071-1050/14/16/10204

 

[TanzanianMagic]

Forget the diagram for hydro. Bugbee explains it here in the last paragraph and the important information about antagonism and synergism is here:

3.3. Synergisms and Antagonisms among Nutrients​

Plant cells and solutions must have electroneutrality, which means that the concentration of cations and anions must be equal. This principle also means that the uptake of cations is associated with the uptake of anions, and vice versa. The principle is the underlying basis for most synergisms and antagonisms in nutrient uptake. Cation uptake inhibits the uptake of other cations, and anions inhibit anions. Conversely, cation uptake promotes the uptake of anions and vice versa.
The form of N uptake dominates synergisms. A high fraction of NH4+ inhibits other cations, especially Ca2+. Solutions with 100% N as NO3− tend to increase cation uptake, especially macronutrient cations like K+, Ca2+, and Mg2+.

In soilless substrates, these nutrient interactions are more complex as cations are absorbed and desorbed from the solid phase depending on pH, but these interactions are simplified in hydroponics where nutrients are uniformly distributed, and availability can be rigorously quantified.
One highly beneficial aspect of managing nutrients by mass balance is that ion concentration in solution is low and nutrient antagonisms are thus minimized. At higher concentrations, several nutrients are insoluble (ferric phosphate, calcium phosphates), and this precipitation reduces their bioavailability. Chapter 2 in Marschner [33] reviews the effects of the form of N uptake on other elements and reviews the literature on specific synergisms and antagonisms.

The “Mulders Chart”, also called the soil mineral wheel, is a commonly referenced diagram that includes lines connecting the nutrient elements that have proposed synergisms and antagonisms (https://www.n-xt.com/en/soil-health/limiting-minerals, accessed 7 June 2022). No physiological basis is given for the many connecting lines on the chart. Surprisingly, this chart does not separate the two forms of N, and it thus neglects some of the most significant nutrient interactions. It was developed from data for mineral soils, where interactions with the solid phase affected nutrient availability.

Source: https://www.mdpi.com/2071-1050/14/16/10204

Thanks for the clarification, it is appreciated.

A few remarks:

- It is true that the chart doesn't differentiate betwen Nitrogen Nitrate (vegging) and Ammonium Nitrate (flowering, or you'll lock out boron).

- There are other secondary and micro-nutrients that are not mentioned on this chart - Silica, Carbon, Molybdemum, Chlorine, Sodium, etc.

However, it is still a handy instrument for figuring out nutrient imbalances. One of many, of course.