List of top Agronomy Questions on Soil Nutrient

Given below are some important features for a tree to be suitable for agroforestry.
(A). It should be suitable for prevailing agro-climatic conditions.
(B). It should be fast growing and preferably nitrogen fixing species.
(C). It should meet needs of farmers for timber, fodder, fuel, fruit and fibre.
(D). It should have ability to generate employment and high returns.
Choose the correct answer from the options given below:

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Among components of sustainability, productivity and ecological viability are more important than economic and social viability.
Reason (R): Because food security depends upon per capita productivity and permanence of productivity depends on ecological base for production.
Choose the correct answer from the options given below:

Immediately after application (injection) of anhydrous \(\text{NH}_3\) into soil, it moves laterally as well as vertically (limited to \(< 5 \text{ cm}\)), and a localized zone known as \(\text{NH}_3\) retention zone is formed. A number of temporary yet dramatic changes occur in the \(\text{NH}_3\) retention zone. These are:
(A). A retention zone of both ammonia (\(\text{NH}_3\)) and ammonium (\(\text{NH}_4^+\)) having circular to oval shape (3-13 cm diameter) is formed.
(B). The concentration of both \(\text{NH}_3\) and \(\text{NH}_4^+\) increased in the range of 1000-3000 ppm.
(C). The pH increased up to 9.0-9.5 in the vicinity of the point of application.
(D). Concentration of \(\text{NO}_2^-\) (nitrite) increased to toxic levels (100-300 ppm).
Choose the correct answer from the options given below:

Potassium (K) is present in soil in different forms. Plants prefer to take up K from the soil as:
(A). Exchangeable K
(B). Solution K
(C). Total or Mineral K
(D). Non-exchangeable K
Choose the correct answer from the options given below:

In India, EID (Parry) Ltd. for the first time produced single superphosphate (SSP) by treating fresh bone meal with \(\text{H}_2\text{SO}_4\) in the year -

Which one of the following is not a genus of Pennisetum as per the clasification of Staph (1934)

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Saline soils are dominated by neutral soluble salts consisting of chlorides and sulphates of sodium, calcium and magnesium.
Reason (R): Sodic soils contain sodium salts capable of causing alkaline hydrolysis, mainly \(\text{Na}_2\text{CO}_3\).
Choose the correct answer from the options given below:

Match List-I with List-II

Choose the correct answer from the options given below:

Nutrient index value (Parker, 1952) is calculated from the number of soil samples falling in the category of low (\(\text{N}_l\)), medium (\(\text{N}_m\)) and high (\(\text{N}_h\)) nutrient status and represented by expression as given below:

Statement A: Variation in environment and landscape leads to soil evaluation rather than soil development.
Statement B: Intermediate topography affords the best condition for the formation of an agriculture-productive soil.
Choose the correct answer from the options given below:

BSH-169 and HBL-113 are the varieties of

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): For determination of total nitrogen in soil, the sample is usually digested with concentrated \(\text{H}_2\text{SO}_4\) in the presence of catalyst mixture consisting of \(\text{K}_2\text{SO}_4\) and \(\text{CuSO}_4\) in the ratio of 10:1.
Reason (R): The \(\text{K}_2\text{SO}_4\) is used to raise the boiling point of \(\text{H}_2\text{SO}_4\) that promote the oxidation of organic matter and conversion of organic N to \(\text{NH}_4^+\)-N, while the \(\text{CuSO}_4\) acts as a catalyst and hastens the breaking down of organic matter and conversion of N to \((\text{NH}_4)_2\text{SO_4\).
Choose the correct answer from the options given below:

The characteristics of saline-sodic soil are:

The sequence of events occuring upon application of urea in soil are:
(A). Hydrolysis
(B). Nitrification
(C). Denitrification
(D). Leaching
Choose the correct answer from the options given below:

The characteristics of ammonium sulphate are:
(A). Ammonium sulphate \([(\text{NH}_4)_2\text{SO_4]\) is a white crystalline and free-flowing fertilizer.
(B). It contains only 20.5% N and classified as low analysis fertilizer and also contains 23.7% S.
(C). It is the best N-fertilizer having least hygroscopicity, indicating that it has excellent physical property.
(D). It is an excellent nitrogenous fertilizer for acid soil.
Choose the correct answer from the options given below:

Followings are the slow release fertilizers having low water solubility that undergo chemical and/or microbial decomposition when applied to soil.
(A). Urea-formaldehyde
(B). Phenyl phosphorodiamidate (PPDA)
(C). Urea-Z
(D). Crotonylidene diurea
Choose the correct answer from the options given below:

Followings are the major sources of feedstock for production of nitrogenous fertilizer. Arrange them in sequence according to their higher share of consumption in India.
(A). Naptha
(B). Natural Gas
(C). Coal or Coke
(D). Electrolysis of water
Choose the correct answer from the options given below:

Deficiency of boron (B) can be corrected by application of which of the following fertilizers?
(A). Borax
(B). Boric acid
(C). Solubor
(D). Lime
Choose the correct answer from the options given below:

For commercial production of DAP (Diammonium phosphate), liquid ammonia is reacted with mineral acid

Match List-I with List-II

Choose the correct answer from the options given below:

Nitrification is a two-step process which refers to the conversion of ammonium (\(\text{NH}_4^+\)) to nitrate (\(\text{NO}_3^-\)).
(A). Nitrification is a two-step process which refers to the conversion of ammonium (\(\text{NH}_4^+\)) to nitrate (\(\text{NO}_3^-\)).
(B). In the first step, Nitrosomonas (obligate autotrophic bacteria) convert ammonium (\(\text{NH}_4^+\)) to nitrite (\(\text{NO}_2^-\)).
(C). The second step of nitrification occurs through Nitrobacter and Nitrosolobus species, which convert nitrite (\(\text{NO}_2^-\)) to nitrate (\(\text{NO}_3^-\)).
(D). The second step of nitrification occurs through Nitrobacter species only, which convert nitrite (\(\text{NO}_2^-\)) to nitrate (\(\text{NO}_3^-\)).
Choose the correct answer from the options given below:

A method of irrigation in which water is applied on per plant basis

If water is available for three irrigations only, at which stages the wheat crop should be irrigated

For qualifying as an essential nutrient, element must satisfy the essentiality criteria propounded by D.I. Arnon and P.R. Stout in the year -