Which of the following statements are true about the fertilizers?

$\mathrm{I}$. They are nutrient specific.

$\mathrm{II}$. They do not provide any humus to the soil.

$\mathrm{III}$. They are absorbed slowly by the plants as they are not much soluble in water.

Which of the following statements are true about urea?

I. Urea is the first organic compound which is synthesised in the laboratory.

II. Urea is the best water-soluble nitrogenous fertilizer.

III. Urea leaves only ${\mathrm{CO}}_2$ after ammonia has been assimilated by plants.

Consider the following statements.

$\mathrm{I}.$  Plants require nitrogen for growth and protein content.

$\mathrm{II}.$ Phosphorus is needed for stimulating growth, ripening of fruits and protection from diseases.

$\mathrm{III}.$Potassium is required for the development of healthy roots, and it aids the ripening of cereals and fruits.

Which of the above statements are correct?

Which of the following are nitrogen fertilizers?

I. Calcium cyanamide.

II. Urea

III. Bone ash.

IV. Ammonium sulphate.

Select the correct answer using the codes given below.

Consider the following statements:

$\mathrm{I}$. Nitrogen, phosphorus and potassium are the major elements needed in large amounts for the healthy growth of a plant.

$\mathrm{II}$. NPK is called Kisan khad.

$\mathrm{III}$. Mixed fertilizers provide nitrogen, phosphorus and potassium to the plants.

$\mathrm{IV}$. Green manure helps in enriching the soil in nitrogen and phosphorus.

Which of the above statements are correct?

Consider the following statements relevant to fertilizers.

I. Superphosphate of lime contains $\mathrm{Ca}{\left({\mathrm{H}}_2{\mathrm{PO}}_4\right)}_2$ and ${\mathrm{CaSO}}_4$.

II. Triple superphosphate is obtained by treating calcium phosphate with concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ acid.

III. Chief potash manures are $\mathrm{KCl}, {\mathrm{K}}_2{\mathrm{SO}}_4$ and ${\mathrm{KNO}}_3$.

IV. The chemical manures must be soluble in soil moisture.

Which of the above statements are correct?

Consider the following statements

$\mathrm{I}.$ The main sources of bio fertilizers are bacteria, cyanobacteria and fungi.

$\mathrm{II}.$ Bio fertilizer and green manures do not pollute the soil.

$\mathrm{III}.$ Potash fertilizer is evaluated as ${\mathrm{K}}_2\mathrm{O}$.

$\mathrm{IV}.$ Phosphatic fertilizer content is expressed as ${\mathrm{P}}_2{\mathrm{O}}_5$.

Select the correct statements using the codes given below.

Match List I and List II and select the correct answer using the codes given below the lists.

Match List I and List II and choose the correct answer by the codes given below the lists.