Acid plants can only be raised with acid soil, so it is necessary to choose acid soil for cultivating sunflower. If the cultivated soil is alkaline soil, you can choose to add a little vinegar to the soil or pour fermented rice washing water into the soil. Both of these two things can change the pH of the soil and turn alkaline soil into acid soil. If you don't know how to distinguish the soil, you can use the pH test paper to test the pH value of the soil. If the index is greater than or equal to seven, it is alkaline soil, and if it is less than seven, it is acid soil. Usually also want to measure more, because the soil will change with time and the environment, if become alkaline soil, we must take measures
In addition to the pH value, the permeability and drainage of the soil should be considered. The root system of sunflower is sensitive, and the soil with good permeability and drainage performance should be used for breeding. In the allocation of cultivation soil, river sand, rotten leaf soil and peat soil can be used in the proportion of 1:1:1, because river sand has good permeability, rotten leaf soil has sufficient nutrients and peat soil has good drainage.
In the growth period of sunflower, it needs more nutrients. It is difficult to meet its needs only by the nutrients in the soil. It needs to increase nutrients through fertilization. When fertilizing, you can choose the animal manure with small stimulation and sufficient nutrients, which can be applied twice a month or so. Can also choose to sell fertilizer shop, let professionals according to the specific situation of the soil configuration fertilizer