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The residue of plants (herbaceous and woody) after burning is called plant ash. Grass ash fertilizer is the ash of plants after burning, so it is the mineral element contained in all plants, and almost all plant ash contains it. The gray matter of plants and trees is light and alkaline, which is easy to go away with the wind when dry and easy to go with water when wet, and it is easy to cause nitrogen volatilization loss when it comes into contact with nitrogen fertilizer.

The main component of plant ash is potassium carbonate (K2CO3) with a relative molecular weight of 138. [1]

Grass ash fertilizer is the ash of plants after burning, so it is the mineral element contained in all plants, and almost all plant ash contains it. Among them, the most abundant is potassium, which generally contains 6-12% potassium, of which more than 90% is water-soluble and exists in the form of carbonate; followed by phosphorus, which generally contains; It also contains calcium, magnesium, silicon, sulfur and micronutrients such as iron, manganese, copper, zinc, boron, molybdenum, etc. The nutrient content of ash varies from plant to plant, with the highest potassium content in sunflower straw (see table below for details).

When the same amount of potassium was applied to plant ash, the fertilizer efficiency was better than that of chemical potassium fertilizer. Therefore, it is a kind of inorganic farm fertilizer with wide range, low cost, complete nutrients and obvious fertilizer efficiency. [2]

Life by-products.

The earthen stoves of rural families burn firewood and grass, and the grass and wood ash produced should be collected at any time according to the above methods.

Production by-products.

Straw that cannot be brought back in the field is mostly burned on the spot. Attention should be paid to concentrated burning, and the ashes of plants and trees should be recovered and returned to the field.

Power plant by-products.

Some power plants use straw and the like as raw materials for power generation. A large amount of plant ash produced after combustion can be returned to the field as a high-quality potassium fertilizer. It can be made into a bagged commercial plant ash fertilizer. After adding other ingredients, it can also be made into plant ash fertilizer with a variety of uses.

In fact, it is to find the integral definitely.

First, the integration interval is [0, 6].

At this point, sinx0, so you only need to discuss ln(1+1 x)-1 (x+1) to sell the mark.

ln(1+1/x)-1/(x+1)

ln(1+x)-lnx-1/(1+x)

Because. lnx is continuous on [x,x+1].

lnx is derivable on (x,x+1).

then, according to the lagrange median value theorem.

Presence (x,x+1) makes the bulk cavity, ln(x+1)-lnx=1*1 =1

Then, ln(1+x)-lnx-1 (1+x)1 -1 (1+x), [because (x,x+1)] therefore, f'(x)>0

That is, when x>0, f(x) increases monotonically.

If you don't understand, please ask.

There are x number of boys and x - 1 number of girls.

x=2(x-1-1)

x = 4 for 4 boys and 3 for girls.

Set up a book to pick up the blind congratulatory bag to mark the spring price of x yuan, and the stationery box is marked with the price of Shen Nian y yuan, x = 3y-6

x+y)*(

Get: x=48, y=18

1. (1) 90 degrees.

2) the square of the nuclei orange ab; For right-angled three-buried oven angles, the sum of the squares of the two right-angled edges is equal to the square of the hypotenuse.

2. Right angle. There are some things that can't be typed, so if you understand it, you can change the group, and if you don't understand it, ask again.

1= 2, ab cd (isotope angles equal, two lines parallel) so 3= 4 (two lines parallel, equal inner wrong angles).