Agronomy - Study Mode

[#181] Milpa system of Central America is a modified form of
Correct Answer

(D) Slash & Burn Cropping

Explanation

Solution: Milpa is a crop-growing system used throughout Mesoamerica. It is a modified form of the Slash & burns cropping system usually practiced in hilly areas of our country. As like in slash and burn, in the milpa system of cropping also a field is cleared from the jungle, cropped for a few seasons and then abandoned for a fresh clearing.

[#182] Heavy applications of potassium fertilizers often lead to reduced absorption of
Correct Answer

(D) Zinc and Copper

Explanation

Solution: Heavy applications of potassium fertilizers often lead to reduced absorption of zinc and copper. The high availability of potassium is unhealthy for plants because it affects the absorption of other critical nutrients required for the development of plants. Whereas the low percentage of potassium can also prevent excess phosphorus from running into the waterways which may damage the aquatic life.

[#183] Number of essential mineral nutrients for plants
Correct Answer

(D) 17

Explanation

Solution: There are overall 17 essential mineral nutrients for plants and these are carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Potassium, Sulphur, Calcium, Magnesium, Boron, Chlorine, Copper, Iron, Manganese, Molybdenum, Nickel and zinc. All these are required in specific proportions by the plants for their proper growth and development.

[#184] Disk Plough is a
Correct Answer

(A) Primary tillage implement

Explanation

Solution: Disk Plough is a primary tillage implement. It employs around, concave disks of hardened steel, sharpened and serrated on the edge, with diameters ranging from 20 - 38 inches. It is used in the dry and hard soil for the first soil tillage after the last harvest.

[#185] Origin of groundnut was
Correct Answer

(A) Brazil

Explanation

Solution: It is believed that groundnut is native to Brazil. The oldest remains of pods have been dated about 7,600 years old, possibly a wild species that was in cultivation. The scientific name of the groundnut is Arachis hypogaea. It is a legume crop grown for its edible seeds.