Agronomy - Study Mode

[#636] Immobilization of sulphur take place when the 'S' content of organic matter is less than
Correct Answer

(D) 0.15%

Explanation

Solution: In soil science, Immobilization means the conversion of inorganic compounds to organic compounds by micro-organisms or plants to make them inaccessible to plants. Immobilization of Sulphur takes place when the 'S' content of organic matter is less than 0.15%.

[#637] Which one of the following is not a dicot weed?
Correct Answer

(D) Cyperus rotundus

Explanation

Solution: Weeds are unwanted plants grown by themselves on any plantation. Weeds are classified into two groups, monocot i.e. grass family, and Dicot i.e. broadleaf plants. Here among all options, Cyperus rotundus is a monocot weed, while others are dicot weeds.

[#638] Optimum seed rate of soybean is (kg/ha)
Correct Answer

(B) 70 - 80

Explanation

Solution: Soybean is an annual legume of the pea family and its edible seed. It is economically the most important bean in the world. The optimum seed rate of soybean is 70 - 80 kg/ha. Soybean is an edible bean, which multiple uses. It contains a significant amount of Phytic acid, Dietary Minerals and B vitamins.

[#639] Propanil is readily absorbed by the
Correct Answer

(C) Leaf

Explanation

Solution: Propanil is a selective post emergence herbicide for controlling broad leaf and grass weeds in rice, potatoes, and wheat. it is readily absorbed by the Leaf. Propanil is an anilide resulting from the formal condensation of the carboxy group of propanoic acid with the amino group.

[#640] The priming intobacco is refers to
Correct Answer

(C) Removal of leaves

Explanation

Solution: The method of harvesting tobacco in such a manner just by removing a few leaves as and when they mature is termed priming. In simple language, it refers to the removal of leaves. Matured leaves of yellowish–green colour with light brown spots are harvested by priming method.