HELP! - Week 5 seedlings - twisting new growth + discoloration

kovidkough

kovidkough

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I like to start at 200ppm for small seedlings and add 100ppm of feed per week slowly so by week 5 or 6 in veg I'm at 700-800
 
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_EQ

_EQ

Well-Known Member
kovidkough said:
ppm is easy measure the base , so just stick it in, let's say for example your tap water starts at 100 for simplicity sake. if your goal is feeding 700ppm of feed then your end number is really 800ppm because 100+700=800
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Okay cool that’s what I thought, our house has hard water so my base ppm is like 400, I usually subtract that from the ppm after testing with nutrients mixed. So like if I had 1200ppm after mix the actual ppm amount of nutrients added is 800
 
kovidkough

kovidkough

Well-Known Member
_EQ said:
Okay cool that’s what I thought, our house has hard water so my base ppm is like 400, I usually subtract that from the ppm after testing with nutrients mixed. So like if I had 1200ppm after mix the actual ppm amount of nutrients added is 800
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correct, now at some point hard water will restrict how much you can add because your ceiling is like 1500ppm so you may consider researching nutrients made specifically for hard water
 
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kovidkough

kovidkough

Well-Known Member
here is a formula to convert to EC,
How do I convert between TDS and EC readings?
To obtain an approximate sodium chloride TDS value, multiply the EC reading (in milliSiemens/cm) by 1000 and divide by 2.

To get an EC value, multiply the ppm reading by 2 and divide by 1000.

Thus, if your EC is 1:

1*1000/2= 500 ppm.

And if your ppm is 500:

500*2/1000= 1 EC
 
_EQ

_EQ

Well-Known Member
kovidkough said:
correct, now at some point hard water will restrict how much you can add because your ceiling is like 1500ppm so you may consider researching nutrients made specifically for hard water
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I’ve boiled down my issues that’s I’ve learned from my first grow. Right now I use MehaCrops all purpose line of nutes, I recently bought their two part system which I think will help with keep the ppms down and still give the right amount of what they need.
 
Renfro

Renfro

Well-Known Member
kovidkough said:
@Renfro has a nutrient calculator somewhere no idea what version he is at but im sure he would share that aswell
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Understanding and Calculating Nutrient PPM

Always good to give this thread another read. I have a question regarding NPK ratios and labeling. GH FLora Bloom is 0-5-4 with P2O5 and K2O. 0-2,15-3,3 is the with elemental P and K. Do you think of this nutrient as: 0-5-4 = 0-1,25-1 ratio or 0-2-3 = 0-1-1,5 ratio ?
www.rollitup.org
 
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