1 is it correct that urea can be sprayed with a variety of pesticides?

Answer: correct

Resolution:

The aqueous solution of urea is neutral and stable. It can be used in combination with chemical weeding, insect control and other fertilizers.

2. Microbial pesticide can be mixed with chemical fertilizer. Is it correct?

Answer: wrong in theory.

Resolution:

Biological pesticides are all living bacteria, while chemical fertilizers are volatile and corrosive, which will inactivate these bacteria. For example, the mixed use of chemical fertilizer and microbial pesticides such as borer killing bacteria and cyanobacteria is easy to kill microorganisms and reduce the control effect.

But in fact, many people use it like this. If it is to be used, water and fertilizer shall be integrated and the multiple shall be increased. Fertilizer and bacterial fertilizer do not need a diluter.

3 human urine and feces can be mixed with ferrous sulfate. Is it correct?

Answer: correct

Resolution:

Adding ferrous sulfate to human urine and feces can convert the highly volatile ammonium carbonate in human urine and feces into consolidated ammonium sulfate, which plays the role of fertilizer retention and deodorization and avoiding nitrogen volatilization.

4 is it correct that plant ash can be mixed with manure and compost?

Answer: wrong

Resolution:

Plant ash is usually applied as potassium fertilizer, which is alkaline. If it is mixed with manure and compost, it will accelerate the loss of nitrogen volatilization with ammonia, so it is not suitable to be applied together.

5. Manure and compost can be mixed with calcium superphosphate or calcium magnesium phosphate. Is it correct?

Answer: correct

Resolution:

The application of calcium superphosphate and calcium magnesium phosphate fertilizer mixed with manure, compost and compost after composting can reduce the contact surface between phosphate fertilizer and soil and prevent phosphate ions from being fixed by soil. Moreover, various organic acids generated by the decomposition of organic fertilizer can promote the release of phosphorus fixed by soil for crop absorption, and the fertilizer efficiency can be increased by one third.

6. What is the most suitable application condition of insoluble phosphate fertilizer?

A base fertilizer, acid soil B topdressing, acid soil C topdressing, alkaline soil D base fertilizer, non acid soil

Answer: a

Resolution:

Insoluble fertilizer can only play its role after a period of time in the soil because it is difficult to dissolve, so it should be used as base fertilizer. In acidic soil, the acidity of soil can be used to promote dissolution.

7. For the shed with more than 3 years, try not to apply base fertilizer?

A cattle and horse dung and other herbivore dung B cake fertilizer c human urine dung or chicken dung pig dung, etc

Answer: choose C

Resolution:

Non herbivore feces are easy to breed nematodes and other diseases and pests.

8 long acting urea is often used as base fertilizer because of its long fertilizer effect. Generally, topdressing is not required, but it must be used when topdressing is required?

A. apply fertilizer early, B. apply fertilizer late, and then apply fertilizer when crop needs fertilizer

Answer: choose a

Resolution:

If it is used as topdressing, because it has a long fertilizer effect period and plays a slow role, too late fertilization may lead to green and late ripening of crops and delay the maturity of crops

9 which of the following is correct for the selection of water-soluble fertilizer?

A tomato, cucumber, watermelon and other fruits are in the fruit growth period, and high nitrogen fertilizer is applied

B high nitrogen fertilizer was applied at fruit setting stage and fruit expansion stage of watermelon

C. in the early stage of crop growth, water-soluble fertilizer with high phosphorus content shall be selected

D in the early stage of crop growth, select a certain amount of nitrogen fertilizer combined with an appropriate amount of water-soluble fertilizer containing phosphorus and potassium

Answer: choose D

Resolution:

(1) In the early stage of crop growth, water-soluble fertilizer with high nitrogen content and appropriate proportion of phosphorus and potassium can be selected, or water-soluble fertilizer with the same proportion of nitrogen, phosphorus and potassium (20-20-20) can be selected to increase the growth of vegetative organs such as stems and leaves.

(2) The selection of water-soluble fertilizer with high phosphorus content can promote flowering and fruit setting in a large number of flowering stages of crops.

(3) The application of high nitrogen fertilizer in the fruit setting period of watermelon is easy to cause the vigorous growth of watermelon vine leaves, and the phenomenon of difficult fruit setting and falling flowers and fruits occurs in the shed without fruit setting. Nitrogen fertilizer can be applied appropriately in the fruit expansion period, but it must not be excessive, otherwise the melon vine will grow madly and the fruit will not grow.

(4) For example, tomatoes, cucumbers, watermelon and other fruits are in the fruit growth period. It is necessary to apply water-soluble fertilizer with high potassium to promote fruit expansion, increase fruit sweetness and help fruit coloring. At this time, excessive application of nitrogen fertilizer will lead to slow fruit growth and even flower and fruit falling.

At what time should foliar fertilizer not be sprayed on crops?

A fruiting stage B strong seedling stage C flowering stage

Answer: C

Resolution:

It is not suitable to spray foliar fertilizer at the flowering stage of crops. At the flowering stage, the flowers are delicate and vulnerable to fertilizer damage.

Compared with simple fertilizer, compound fertilizer is mixed with elements such as nitrogen, phosphorus, potassium and so on?

A early construction and late construction can be used, B late construction and C early construction

Answer: C

Resolution:

Because it contains many elements such as nitrogen, phosphorus and potassium, it needs to be used early in order to give full play to the nutrients of phosphorus and potassium.

12 what are the characteristics of stable manure maturity?

A brown, soft, moldy B brown, soft, smelly c ash, soil, powder D black, rotten, smelly

Answer: D

Resolution:

The composting process of stable manure generally goes through three stages: raw manure, semi composting and composting. Raw dung is a mixture of undigested dung and urine and bedding materials. Semi rotten dung and urine and bedding materials become soft and musty. When feces are generally brown, rotten dung and urine and bedding materials become black, rotten and smelly.

13 which of the following are not physiologically acidic fertilizers?

A ammonium chloride B potassium sulfate C ammonium bicarbonate D ammonium sulfate

Answer: C

Resolution:

Some chemical fertilizers are dissociated into positive ions and anions after being applied to the soil. Because crops absorb more cations than anions, more acid root ions remain in the soil, so as to improve the acidity of the soil (or soil solution). This kind of fertilizer that improves the acidity of the soil after crops absorb nutrients is called physiological acid fertilizer.

For example, ammonium sulfate, crops absorb more NH4 + than SO42 -, and SO42 - remaining in the soil combines with H + (or dissociated H +) released by crop replacement absorption to form sulfuric acid, so as to improve the acidity of the soil. Therefore, ammonium sulfate and ammonium chloride are physiologically acidic fertilizers. Ammonium bicarbonate is a physiologically neutral fertilizer.

The following organic fertilizers belong to thermal fertilizers?

A cow dung B horse dung C chicken dung D pig dung

Answer: B

Resolution:

All farm fertilizers that can produce high temperature in the process of accumulation are called thermal fertilizers. For example, horse manure has a large calorific value when decomposed, so it belongs to thermal fertilizers. Sheep manure and rabbit manure also belong to thermal fertilizers.

The organic fertilizer that is not fully fermented and decomposed basically belongs to thermal fertilizer.

All farm manure with low calorific value in the accumulation process belongs to cold fertilizer. For example, cow manure decomposes slowly, has low calorific value and does not produce high temperature, so it belongs to cold fertilizer, and pig manure also belongs to cold fertilizer.

Thermal fertilizer and warm fertilizer should be fermented and decomposed when used, otherwise they should not be used in large quantities near crop roots.

After the cold fertilizer is used, it generally will not heat again in the soil and basically will not burn roots (it is recommended to use after fermentation). It is characterized by fine texture, more water content, slow decay and difficult decomposition; It is suitable for sandy soil, which is not only conducive to the decomposition and maturity of fertilizer, but also improve the performance of soil water and fertilizer retention. It is generally used as base fertilizer.

What kind of nitrogen fertilizer is most likely to cause soil hardening?

A ammonium nitrate B ammonium chloride C urea D ammonium bicarbonate

Answer: B

Resolution:

Crops have a selective absorption of ammonium chloride, which will leave more chloride ions in the soil, resulting in excess anions and the formation of corresponding acids, resulting in soil hardening.

Transferred from China chemical fertilizer network source: daily agricultural materials