Agronomy - Study Mode

[#246] Which of the following is a species of American cotton?
Correct Answer

(B) Gossypium hirusutam

Explanation

Solution: Gossypium hirsutum is also known as upland cotton or American cotton. The United States, the world's largest exporter of cotton, constitutes nearly 95% of all cotton production. It is native to America which is why also called American or Mexican cotton.

[#247] The optimum pH of soil for rice cultivation is varies in range
Correct Answer

(A) 4 - 6

Explanation

Solution: Rice cultivation is a submerged plantation, it requires specific clay or clay loam soil for water logging. The suitable soil pH for rice cultivation varies in the range of 4 - 6. It is slightly on the acidic side and rice is relatively tolerant of acid conditions and suited to the topographic sites on which such soil occurs.

[#248] Retting temperature for jute is
Correct Answer

(D) 34°C

Explanation

Solution: Retting is the process employing the action of micro-organisms and moisture on plants to dissolve or rot away much of the cellular tissues and pectins surrounding bast-fiber bundles, thus facilitating the separation of fiber from the stem. This is the process involved in the production of linen from the flax stalks and coir from the coconut husks. Retting of Jute done at 34°C.

[#249] Who is the founder of relay cropping?
Correct Answer

(A) Dr. Biwant Raj

Explanation

Solution: Relay cropping is a method of multiple cropping where one crop is seeded into a standing second crop well before harvesting the second crop. Dr. Biwant Raj is the founder of Relay cropping. It offers economic benefits and reduces nitrate leaching from the soils.

[#250] Match the column I (centeres) with column II (place) and select correct answer: Column I Column II a. NBSS 1. Karnal b. CSSRI 2. Nagpur c. IPC 3. Peru d. ILCA 4. Ethiopia
Correct Answer

(B) a-2, b-1, c-3, d-4

Explanation

Solution: NBSS stands for National Bureau of Soil Survey the headquarters of the Bureau is shifted to Nagpur in June 1978. CSSRI stands for central soil Salinity Research Institute located in Karnal, Haryana, India. IPC is an International Petroleum Company, settled in Peru. ILCA stands for The International Livestock Centre for Africa and is located in Ethiopia.