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Question:

Why do I grow sunflowers so small?,

Short, and feel the body can not bear the weight of the disc like askew, leaves are still yellow, is not to chemical fertilizer?It's not planted in the pot. There's a small plot in my yard. But the soil is not so good. It's a deep layer of soil bought from the construction site. It's yellow and sticky. Can I apply some fertilizer?

Answer:

May be the reasons for varieties, I also have a species of nearly ten strains of sunflower, short 0.8 meters, 1.8 meters long, but this disk is not large, the particles are very full. From your supplementary question, it turns out to be the soil fertilizer problem, and the surface black soil must be the surface. Now it is too late to apply fertilizer. Sunflower fertilizer requirements are very high, the soil is not long on the high, small disk.
You planted it yourself. Where did that seed come from? Is your harvest, or their raw sunflower seeds directly saved seed?This is the cross breeding offspring separation phenomenon, we use the general production called F1, need a special department of seed breeding, these seeds will yield strong, but if you take these seeds out again in sowing, there will be serious character separation separation performance, differ in thousands, one that you see, no wonder.
It could be a wild variety
Obvious malnutrition; digging!!!!Go to the market and buy some nutritious soil to change it. The lack of Nitrogen Potassium Fertilizer deficiency leaves yellow, small flowers stalks fine......And the flower loves the light.

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