List of top Agronomy Questions

__________ is considered as father of conservation tillage. He wrote the book entitled __________

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.
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Assertion (A): Gypsum can be used to manage sub-soil acidity.
Reason (R): The \(\text{SO}_4^{2-}\) released by dissolution of gypsum increases level of Ca and reduces level of Al in both soil solution and exchange complex.
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Journal of Soil and Water Conservation is published by

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.
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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 -

Sulphur deficiency first occurs in

Read the following statements regarding phosphorus:
(A). In normal P-sufficient plants, P-content varies from 0.1% to 0.4% by weight, which is 1/5th to 1/10th of N or K content.
(B). Phosphorus containing ATP is called the "Energy currency of the plants".
(C). Plant roots absorb P in the \(\text{H}_2\text{PO}_4^-\) form, but under neutral to alkaline environments, \(\text{HPO}_4^{2-}\) and or \(\text{PO}_4^{3-}\) ions could also be taken up.
(D). Phosphorus is a structural component of the nucleic acids (DNA and RNA), and also a constituent of fatty phospholipids.
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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).
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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
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Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Fixation and release of \(\text{K}^+\) in soil is influenced by absence or presence of ammonium ion (\(\text{NH}_4^+\)).
Reason (R): The physics of \(\text{NH}_4^+\) is closely related to that of \(\text{K}^+\) because both ions have similar ionic radii and low hydration energy.
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The flour corn is also known as

'Pusa Kiran' is a variety of

Which of the followings is not a method of computing water balance in Thornthwaite's 1948 systems?

VL-149 and Gautami are the varieties of _______

Which one of the followings is not a drought tolerant variety ?