Hello everyone, I am a star brother said farmer, now into May, the temperature in all parts of our country generally rose to more than 20 ° C, which also came to the time when farmers planted sweet potatoes, sweet potatoes are widely planted due to short cycles, high yields, good economic benefits, but in the long-term planting process, most of the farmers use chemical fertilizer as the bottom fertilizer, after many years of soil water retention and fertilizer retention is reduced, sweet potato yield and quality greatly reduced, in fact, the old ancestors have long told us what the bottom fertilizer of sweet potatoes is used, as the saying goes, "a sweet potato a handful of ash, a large pile of sweet potato knots", It is said that the bottom fertilizer of sweet potato planting is grass and wood ash.
First, what is grass and wood ash
In the past, every household in the countryside was a firewood and soil stove, the courtyard was full of grass and wood ash, grass and wood ash was rich in potassium, specifically the residue of herbs and woody plants after burning, because it came from plant combustion, so all the elements contained in plants it had, and for farmers, there were many sources, ashes from home fire cooking, straw burning in the field and so on.
Second, the composition of grass and wood ash
The main component of grass and wood ash is potassium carbonate, but also contains calcium, magnesium, and iron, manganese, copper, zinc, molybdenum and other trace nutrients, is a high-quality organic fertilizer, of course, different plant ashes, its nutrient content is also different, scientific studies have shown that sunflower straw potassium content is the highest.
Third, sweet potatoes with grass and wood ash why is good
Sweet potato is an underground stem metamorphosis, especially like potassium, and grass and wood ash loose expansion, as a bottom fertilizer, can make the soil become loose and porous, increase the soil permeability, so that sweet potato growth becomes relatively easy, sweet potato mature after the expansion of the soil layer into piles, the knot is large and more, so a nest of sweet potatoes a handful of ash, a large pile of sweet potato knots.
Grass and wood ash can absorb water, the grass and wood ash as the bottom fertilizer, can keep the soil moisture not too wet, reduce the incidence of sweet potato physiological diseases, while the grass and wood ash is acidic, can improve the alkaline soil, so that the sweet potato grows healthy, and potassium can promote the color and sweetness of the sweet potato, but also kill some acid-intolerant pests, improve the commerciality of sweet potatoes.
Fourth, the precautions for grass and wood ash
Grass and wood ash is carbonate, acidic, so it can not be used with ammonium nitrogen fertilizer, organic fertilizer, while grass and wood ash meets water to dissipate heat, can not be directly in contact with sweet potato underground stems, so as not to burn seedlings to reduce the survival rate.
In short, sweet potato bottom fertilizer with grass and wood ash can make the sweet potato knot large and more, and grass and wood ash is easy to obtain, can completely replace potassium fertilizer, if the long-term use of chemical fertilizer, not only leads to soil salinization, and sweet potato yield is low, poor quality, planting sweet potatoes want to have high yield, grass and wood ash is indispensable.