I am 2 weeks into veg and on some of my girls there are some really light green ( almost yellowish) leaves. Some of the new growth is this color too. It looks kind of yellow under the Hortilux HPS but outside it is definitely more of a light green. I would have a pic, but my digi is on the fritz. I can try a phone pic, but not great quality. Any advice is greatly appreciated. I did do a search, but no results looked like mine. TIA!!!
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2 weeks in veg some leaves and new growth realy light green
- Thread starter MattHend
- Start date
G
GR8shoeBaDizzle
hydro or soil?
Blackvelvet
Member
If there are nutrients in the soil when you planted, your ph may be too high.
-Or-
If no nutrients were added at planting, then you need to begin adding weak ferts.
I suggest finding a nitrogen, phosphorus, and potassium fert also containing all 6 micronutrients: iron, manganese, zinc, copper, boron, and molybdenum. It should be high in nitrate nitrogen and low in urea or ammonia nitrogen. (Do the best you can) Somebody mentioned a 20-10-20 at Lowes that fit this description. You would add about 1/2-3/4 teaspoon per gallon of water everytime you water. Ensure that you get alot of runoff out the bottom of the container.
If you added dolomite lime to your soil mix, great. The plants will get calcium and magnesium. If you forgot dolomite lime
, you can add some at next transplanting. Try a couple teaspoons per gallon of soil mix. Since the pots are small, I don't suggest trying to sprinkle it on the surface (you could if they were larger). Instead add cal mag in the water along with the npk + micros.
Here are some general directions for adding cal mag...
You need to adjust the ph of your fert water after mixing and also test ph in your soil mix. So, you at least need some ph test strips in the aquarium section of a petstore or a brew your own beer/wine store. Ph test strip range 4-7 is ok. Better a narrower range around 6.
How to test soil ph: After watering/ferting till runoff, wait 30 minutes. Apply a small amount of distilled water to the pot surface till 1 or 2 ounces of runoff occurs. Catch this on a saucer. Test this ph. If after watering/ferting and waiting 30 minutes you can tilt the pot and get some liquid out, you can test that instead.
You would use powdered/pulverized not pelletized dolomite lime to provide calcium and magnesium. You can only use this if your ph is low. Adding lime when the soil ph is ok will cause problems.
If ph is low, you can surface apply the lime at 1 1/5 teaspoon per gallon of soil mix. Water in.
If ph is ok or high, you can add cal mag to your fert by using 1/4 teaspoon powdered gypsum and epsom salts per gallon of water along with the regular fert. Calcium nitrate could be used instead of gypsum at the same rate. Calcium chloride sold under names like tomato blossom end rot stopper could be used instead of gypsum. It will take the % ca and net weight of the bottle to give you a rate of 60 ppm ca. Calcium chloride and calcium nitrate are much easier to disolve than gypsum. Easily disolvable gypsum you can find at brew your own beer/wine stores.
Using just dolomite lime does not provide sulfur. (actually needed in large quantities) You can mix gypsum into the soil at planting at 3/4 teaspoon per gallon of mix to provide this or in your case, you might add 1/4 teaspoon epsom salts occassionally in the water (1 gallon) to provide sulfur along with your surface applied lime.
-Or-
If no nutrients were added at planting, then you need to begin adding weak ferts.
I suggest finding a nitrogen, phosphorus, and potassium fert also containing all 6 micronutrients: iron, manganese, zinc, copper, boron, and molybdenum. It should be high in nitrate nitrogen and low in urea or ammonia nitrogen. (Do the best you can) Somebody mentioned a 20-10-20 at Lowes that fit this description. You would add about 1/2-3/4 teaspoon per gallon of water everytime you water. Ensure that you get alot of runoff out the bottom of the container.
If you added dolomite lime to your soil mix, great. The plants will get calcium and magnesium. If you forgot dolomite lime
, you can add some at next transplanting. Try a couple teaspoons per gallon of soil mix. Since the pots are small, I don't suggest trying to sprinkle it on the surface (you could if they were larger). Instead add cal mag in the water along with the npk + micros.Here are some general directions for adding cal mag...
You need to adjust the ph of your fert water after mixing and also test ph in your soil mix. So, you at least need some ph test strips in the aquarium section of a petstore or a brew your own beer/wine store. Ph test strip range 4-7 is ok. Better a narrower range around 6.
How to test soil ph: After watering/ferting till runoff, wait 30 minutes. Apply a small amount of distilled water to the pot surface till 1 or 2 ounces of runoff occurs. Catch this on a saucer. Test this ph. If after watering/ferting and waiting 30 minutes you can tilt the pot and get some liquid out, you can test that instead.
You would use powdered/pulverized not pelletized dolomite lime to provide calcium and magnesium. You can only use this if your ph is low. Adding lime when the soil ph is ok will cause problems.
If ph is low, you can surface apply the lime at 1 1/5 teaspoon per gallon of soil mix. Water in.
If ph is ok or high, you can add cal mag to your fert by using 1/4 teaspoon powdered gypsum and epsom salts per gallon of water along with the regular fert. Calcium nitrate could be used instead of gypsum at the same rate. Calcium chloride sold under names like tomato blossom end rot stopper could be used instead of gypsum. It will take the % ca and net weight of the bottle to give you a rate of 60 ppm ca. Calcium chloride and calcium nitrate are much easier to disolve than gypsum. Easily disolvable gypsum you can find at brew your own beer/wine stores.
Using just dolomite lime does not provide sulfur. (actually needed in large quantities) You can mix gypsum into the soil at planting at 3/4 teaspoon per gallon of mix to provide this or in your case, you might add 1/4 teaspoon epsom salts occassionally in the water (1 gallon) to provide sulfur along with your surface applied lime.
thanks guys, ;ittle meore info
thanks guys, ;ittle meore info
I used pure promix as a medium, and New Earth Custom Grow 7-9-5 as my nutrient. I have been mixing at a ratio of 3/4 tsp per gallon. i did not wait util 90% absorbtion to water the last time , more like 75%. They are in 3 gal pots. Should I wait for 90% absorbtion, then water till i get runoff out of the bottom? Thanks so much
thanks guys, ;ittle meore info
I used pure promix as a medium, and New Earth Custom Grow 7-9-5 as my nutrient. I have been mixing at a ratio of 3/4 tsp per gallon. i did not wait util 90% absorbtion to water the last time , more like 75%. They are in 3 gal pots. Should I wait for 90% absorbtion, then water till i get runoff out of the bottom? Thanks so much
Blackvelvet
Member
Does the earth grow contain micronutrients? Use about 1 teaspoon per gallon. When plants get larger, up the rate to about 1 1/2 teaspoons for extra growth.
Promix does contain dolomite lime. It does not however contain sulfur. If your ferts lack sulfur, add 1/4 teaspoon per gallon epsom salts occassionally along with the earth grow.
I don't understand the absorbtion your talking about. Add fert water till quite a bit flows out the bottom.
Optimum ph in promix is 5.6 to 6.2 You should be adjusting the fert water before applying to 5.8 to 6 Also, occassionally test the soil mix ph using the directions above.
You should start your plants in smaller containers then transplant as they grow larger.
Promix does contain dolomite lime. It does not however contain sulfur. If your ferts lack sulfur, add 1/4 teaspoon per gallon epsom salts occassionally along with the earth grow.
I don't understand the absorbtion your talking about. Add fert water till quite a bit flows out the bottom.
Optimum ph in promix is 5.6 to 6.2 You should be adjusting the fert water before applying to 5.8 to 6 Also, occassionally test the soil mix ph using the directions above.
You should start your plants in smaller containers then transplant as they grow larger.
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I waited till the medium was 60% to 75% dry instead of 90% when i last watered. The plants are about 24" tall now and are about perfect (IMVHO) for the pots as they will be switched to 12/12 in about a week, after some LST action. I will post some phone pics in a little while. Thanks again all for all the advice, it will be heeded!!
Right on blackvelvet. 
Blackvelvet
Member
You add the epsom salts if you need some sulfur. Do this only occassionally. If your ferts contain potassium sulfate, magnesium sulfate, calcium sulfate, etc... you don't need extra sulfur.MattHend said:
You start plants out in smaller containers and let them get slightly rootbound. Then, you transplant to larger pots. When starting out in a large container first the plants don't really use the space efficiently. Don't worry about it now.
Eventually if you have not repotted in some time, the dolomite lime will begin to run out. Sure sign is magnesium deficiency. Yellow older leaves but veins remain green. You should start adding calcium and magnesium in your water. I gave you directions before how to do this if needed.
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Blackvelvet
Member
After seeing the pictures, I might guess you need to start adding cal mag to the water. Looks like maybe magnesium deficiency. You might drench the pots once with 1 teaspoon epsom salts per gallon of water. This will not harm the plants. Then add a low rate of cal mag everytime along with the regular ferts. (if they don't already contain cal mag) If ph is too low after checking you could add some dolomite lime to the soil surface at 1 1/5 teaspoons per gallon of soil and water in...you could skip the cal mag in your water for a while then. You should be adding ferts to your water everytime. Plants are big enough to use 1 1/2 teaspoons regular fert per gallon.
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G
GR8shoeBaDizzle
cal mag and a bigger pot! 4 bigger pot 2 burn
Blackvelvet
Member
Summary
Summary
You should double the amount of ferts from 3/4 teaspoon to 1 1/2 teaspoon. 3/4 teaspoon per gal is so weak you could pour it on baby seedlings. Apply fert water everytime you water till alot of runoff comes out the bottom. Adjust fert water ph before applying to 5.8 to 6
Check ph.
If ph low (less than 5.6), surface apply dolomite lime 1 1/5 teaspoons per gallon of mix.
If ph is good 5.6 +, drench once with epsom salts at 1 teaspoon per gallon of water then add a small amount of cal mag in your water everytime.
Your fert does contain all 6 micronutrients.
Summary
You should double the amount of ferts from 3/4 teaspoon to 1 1/2 teaspoon. 3/4 teaspoon per gal is so weak you could pour it on baby seedlings. Apply fert water everytime you water till alot of runoff comes out the bottom. Adjust fert water ph before applying to 5.8 to 6
Check ph.
If ph low (less than 5.6), surface apply dolomite lime 1 1/5 teaspoons per gallon of mix.
If ph is good 5.6 +, drench once with epsom salts at 1 teaspoon per gallon of water then add a small amount of cal mag in your water everytime.
Your fert does contain all 6 micronutrients.
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