When fertilizing saline alkaline soils, it should be chosen

Correct answer a

The consideration point of this question is not the same as chemistry, and here it is understood as how to neutralize salinity, so only physiological acidic salts can be applied, so choose A.

Physiological acidic salts.

For example, the concentration of potassium ions in the pond water is low, but the concentration of potassium ions accumulated in the vacuoles of the algae growing in the pond is high. The concentration of sodium ions in seawater is very high, but the concentration of sodium ions in the vacuoles of Cystis frandolphus grown in seawater is relatively low. This selective absorption is manifested not only in the different amounts of different salts, but also in the different amounts of cations and anions for the same salt.

For example, when ammonium sulfate is supplied, the absorption of ammonium ions by plants is much greater than that of sulfate ions. Since the root cells must have the same charge to exchange with the same while absorbing the environment. So the concentration of hydrogen ions in the environment increases, and the pH value decreases.

This salt is called a physiological acidic salt. Most ammonium salts belong to this type of salt. In contrast, sodium nitrate and calcium nitrate are physiological alkaline salts.

In addition, there is a class of compounds whose anions and cations are absorbed at almost the same rate and have no effect on the acidity and alkalinity of the soil solution, which are called physiological neutral salts, such as ammonium nitrate.

Select A. Saline-alkali soil contains a large number of alkaline substances, so choose acidic substances when fertilizing, so that it can be neutralized, so choose from A and D, one molecule in option A contains two molecules of H+ ions, and one molecule in D contains only one molecule of H+ ions, so choose A. (NH4+ hydrolysis is acidic).

The application of organic fertilizer can effectively increase the content of soil organic matter and increase the number of beneficial bacteria and microorganisms.

The amount of fertilizer is small and can avoid nutrients being fixed by the soil, which is economical and effective fertilization method ().

a.Foliar sprays.

b.Drip irrigation top dressing.

c.Sprinkler irrigation top dressing.

d.Rush to give way to the stalk.

Correct answer a

Summary. 1. To fertilize sandy soil, apply more organic fertilizer, and apply chemical fertilizer as little as possible. 2. The amount of fertilizer applied at one time should not be too large (especially nitrogen fertilizer), so as not to cause fertilizer damage or serious loss.

3. Micro fertilizer should be applied together with organic fertilizer. This is because fruit trees grown on sandy soils are prone to lack of boron, zinc, magnesium and other elements, which can also cause loss or local poisoning when applied alone. 4. Orchard mulching, try to apply semi-decaying organic fertilizer, and do not advocate the use of raw grass.

5. The three elements of nitrogen, phosphorus and potassium account for 30%-50% of the annual application amount in basic application. The rest of the dosage was applied evenly at different growth stages.

What kind of water and fertilizer management should be adopted for sandy soils?

1. To fertilize sandy soil, apply more organic fertilizer, and apply chemical fertilizer as little as possible. 2. The amount of fertilizer applied at one time should not be too large (especially nitrogen wisdom), so as not to cause fertilizer damage or serious loss. 3. Micro fertilizer should be applied together with organic fertilizer.

This is because fruit trees grown on sandy soils are prone to lack of boron, zinc, magnesium and other elements, which can also cause loss or local poisoning when applied alone. 4. Orchard mulching, try to apply semi-decaying organic fertilizer, and do not advocate the use of raw grass. 5. The three elements of nitrogen, phosphorus and potassium account for 30%-50% of the annual application amount in basic application.

For the rest of the dosage, the former shouting was evenly applied at different growth stages.

Because the organic matter content of sandy soil is low, the fertilizer and water retention ability is poor, and the fertilizer efficiency is rapid, but the stamina is insufficient.

Combined with the texture, structure, porosity and colloidal characteristics of Thumin loam, please discuss the characteristics of sandy soil in Xinjiang. According to the specific characteristics, what kind of water and fertilizer management simplification measures should be taken?

You can ask my teacher about this. Professor Hu Sox of Chengdu Agricultural Bureau, Sichuan Province. Because I don't know much about it. You say so advanced. I can't embarrass you either.