Flush or Feed?

[blackbantam]

Hello, I am having some trouble with a few of my plants. All are autoflower ak-47 growing in soil indoors. The plants are 39 days old. I have been using Foxfarm nutrients full strength every other watering. My problem is that on most of my plants the lower fan leaves are starting to yellow and this seems to be working up the plant. The plants are suppose to finish is 70 days so this seems too early for me for the plants fan leaves to start to yellow. But some leaves also have some burn on the tips of the leaves and and a few leaves on the lower buds are curving down which would make me think I am over fertilizing. So please help I'm not sure what to do. Thanks!

 

[JoeCa1i]

They're fine.Just giveum bloom nutes.No nutes the last 2 weeks,just water.

 

[alexonfire]

Im having the same thing on my plants, this happened to me last time and all the leaves died off i dont know what causes this problem?

 

[smoking chef]

Fox farms liquid nutes are very acidic. I always have to raise the ph of my water to 8.5 and then add the nutes. I was having the same problem till I read the faqs on their websight. Problem solved.

 

[GreedAndVanity]

I think it is natural for plants to shed some leaf. If you are not ph adjusting do that. I would feed them if the leaves developed the yellow from the outer edges remaining green twoards the center/vascular bundles. That would be a nutrient deficiency.

It looks from your pictures that they might be a little over nuted however. I might space out a feeding with an extra watering, make sure plenty of run off forms.

 

[yblek83]

I also like to test the ph of my runoff, then I know for sure what my plant is enduring.

 

[smoking chef]

Good point yblek83 fox farms ocean forest is a little acidic also. I dont know if they changed their recipe or not but it just seems different. Anyone else notice this?

 

[Uncle Ben]

Hello, I am having some trouble with a few of my plants. All are autoflower ak-47 growing in soil indoors. The plants are 39 days old. I have been using Foxfarm nutrients full strength every other watering. My problem is that on most of my plants the lower fan leaves are starting to yellow and this seems to be working up the plant. The plants are suppose to finish is 70 days so this seems too early for me for the plants fan leaves to start to yellow. But some leaves also have some burn on the tips of the leaves and and a few leaves on the lower buds are curving down which would make me think I am over fertilizing. So please help I'm not sure what to do. Thanks!

Not enough N, wrong NPK ratio, typical around these parts. Don't worry about pH. Here's my ditty:

A common mistake for growers when they reach the flowering stage is to start hitting the plants with a high P fert like 10-60-10, continuing to use this blend exclusively, and when their plants start experiencing a deficit of N or micros as reflected by the dropping of lower leaves and chlorosis, they wonder why. Plants flower as a response to long nights, not because of fert blends high in P. A ratio of 10-60-10 is WAY to high in P. The plant will only take what it needs and compete for other elements that may be more important at the time.

You may have heard that too much N can inhibit flowering. No question about it, exclusive use of a plant food that is rich in N such as blood meal, a 5-1-1 blend, or ammonium nitrate may inhibit flowering especially if the phosphorous level is low, but most balanced blends have sufficient amount of P to do the job. Manufacturers/horticulturists will give you element analysis and what effect the elements have on plant growth, but remember this does not necessarily mean you will get better yields. Using a high P fert exclusively during flowering can actually work against you. It's an abundant amount of healthy leaves going into 12/12 that produce a lot of bud, not high P ferts.

I rotate fert blends as the plant *requires* them, not because it is "the thing to do." For example, when your plants are going thru the stretch phase during early flowering, they may need more N, especially if you're getting some yellowing in the lower/mid leaves. Give up the cannabis paradigms, and give them what they need. Go back to mild high P fert when the stretch ends, maintaining the foliage in a healthy state of growth until harvest for maximum yields. A 1-3-2 blend such as Peter's Pro Blossom Booster, 10-30-20, is one of the best flowering blends on the market because of several factors - it is higher in nitrate N and Mg. It is sold under the Jack's Classic label. An added benefit of Peter's blends is their use of high quality, very pure salts that will cut down on root burn.

UB

 

[alexonfire]

Not enough N, wrong NPK ratio, typical around these parts. Don't worry about pH. Here's my ditty:

A common mistake for growers when they reach the flowering stage is to start hitting the plants with a high P fert like 10-60-10, continuing to use this blend exclusively, and when their plants start experiencing a deficit of N or micros as reflected by the dropping of lower leaves and chlorosis, they wonder why. Plants flower as a response to long nights, not because of fert blends high in P. A ratio of 10-60-10 is WAY to high in P. The plant will only take what it needs and compete for other elements that may be more important at the time.

You may have heard that too much N can inhibit flowering. No question about it, exclusive use of a plant food that is rich in N such as blood meal, a 5-1-1 blend, or ammonium nitrate may inhibit flowering especially if the phosphorous level is low, but most balanced blends have sufficient amount of P to do the job. Manufacturers/horticulturists will give you element analysis and what effect the elements have on plant growth, but remember this does not necessarily mean you will get better yields. Using a high P fert exclusively during flowering can actually work against you. It's an abundant amount of healthy leaves going into 12/12 that produce a lot of bud, not high P ferts.

I rotate fert blends as the plant *requires* them, not because it is "the thing to do." For example, when your plants are going thru the stretch phase during early flowering, they may need more N, especially if you're getting some yellowing in the lower/mid leaves. Give up the cannabis paradigms, and give them what they need. Go back to mild high P fert when the stretch ends, maintaining the foliage in a healthy state of growth until harvest for maximum yields. A 1-3-2 blend such as Peter's Pro Blossom Booster, 10-30-20, is one of the best flowering blends on the market because of several factors - it is higher in nitrate N and Mg. It is sold under the Jack's Classic label. An added benefit of Peter's blends is their use of high quality, very pure salts that will cut down on root burn.

UB

Good to know, I will be doing this from now on. Thanks!