Soil Science - Study Mode

[#106] Fertiliser needed to make 300 L of 1% solution is
Correct Answer

(A) 3 Kg

Explanation

Solution: The fertilizer needed to make 300 L of 1% solution is 3 kg. As 1% of 300 is 3 therefore, the amount of fertilizer required will be 3 kg. The amount of fertilizer is decided after the proper testing of soil, what nutrient is required in which amount according to the type of crop grown on that certain piece of land.

[#107] CEC values for organic soils lies in range of
Correct Answer

(A) 50 - 100 meq/100 g

Explanation

Solution: The cation exchange capacity is a measure of how many cations can be retained on soil particle surfaces. Negative charges on the surfaces of soil particles bind positively charged atoms or molecules (cations) but allow these to exchange with other positively charged particles in the surrounding soil water. CEC values for organic soils lie in the range of 50 - 100 meq/100 g.

[#108] Arc process is related with manufacturing of which fertilizer?
Correct Answer

(A) Nitrogenous

Explanation

Solution: Arc process is related to the manufacturing of Nitrogenous fertilizer. The first synthetic N fertilizer was calcium nitrate, made in 1903 from nitric acid produced by the electric arc process. An arc reactor discharge device for producing nitrogen oxides by an arc discharge process.

[#109] The nitrification process is most active when the pH is between
Correct Answer

(B) 6.5 and 7.5

Explanation

Solution: The nitrification process is most active when the pH is between 6.5 and 7.5. It is observed that the nitrification process is pH sensitive and the rates of nitrification will decline significantly at pH value below 6.5. Therefore, it is important to maintain adequate alkalinity to provide pH stability and also to provide inorganic carbon for nitrifiers.

[#110] Which one of the following is an example of positive interaction
Correct Answer

(C) P × Si