Soil Science - Study Mode

[#466] Match the following columns: Column I (Available nutrients) Column II (Extractant) a. Boron 1. 0.15% CaCl 2 Solution b. Nitrogen 2. Hot water c. Sulpher 3. Alkaline KMNO 4
Correct Answer

(C) a-2, b-3, c-1

Explanation

Solution: Boron is extracted with a pressurized and conventional boiling hot water extraction method. this method is inexpensive and rapid to predict Boron availability in arid soils. The easily hydrolyzable and oxidizable fractions of organic nitrogen present in a soil sample can be extracted using alkaline KMnO 4 , which is a mild oxidizing agent. In this method, a known amount of soil sample is boiled with a measured quantity of alkaline KMnO 4 . Total Sulphur in soils was determined by the method of Steinbergs and soluble sulphate by extraction with 0.15% calcium chloride. Since calcium is the primary cation on the adsorbed complex of soils, the CaCl 2 solution is better able to extract other absorbed cations than would solutions containing other cations.

[#467] Which of the following elements is not major nutrient element?
Correct Answer

(D) Zn

Explanation

Solution: Zinc is one of the following options that are not a major nutrient element. Whereas Nitrogen. Phosphorus and Sulphur are major or macronutrient elements required in large amounts by the plants for growth and development. Zinc is the minor or micronutrient element required in a very less amount by the plants for their survival and development. Zinc is an important component of various enzymes and thus plays a vital role in its metabolic functioning.

[#468] Fertilizer control order issued in
Correct Answer

(A) 1957

Explanation

Solution: The fertilizer control order came in the year 1957. The Fertilizer Control Order, 1957 was issued under Section 3 of ECA, 1955 to regulate manufacture, trade and distribution of Fertilizers in the country. The main aim of the fertilizer control Order is to ensure adequate availability of the right quality of fertilizers at the right time and right price to farmers, the fertilizer was declared an essential commodity and fertilizer control order (FCO). It also works to regulate, trade, price, quality and distribution of fertilizers in the country.

[#469] Actinomycetes are mainly
Correct Answer

(C) Gm + actinomycetes

Explanation

Solution: Actinomycetes are mainly Gm + actinomycetes, which refers to these are gram-positive, free-living and saprophytic. Actinomycetes species are ubiquitous, occurring in soil and the microbiota of animals, including the human microbiota. They are known for the important role they play in soil ecology, they produce several enzymes that help degrade organic plant material, lignin and chitin.

[#470] Match the following columns: Column I (Methods of measuring soil moisture) Column II (Useful range kpa) a. Tensiometer 1. 0 to < -1500 b. Resistance blocks 2. 50 to < -10000 c. Neutron scattering 3. -100 to< -1500 d. Pressure membrane apparatus 4. 0 to -85
Correct Answer

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

Explanation

Solution: Tensiometer is used to measure head and pressure in the unsaturated zone in the soil. Its range is between 0 to -85 kpa. A resistance block is a soil moisture block often referred to as a gypsum block or electrical resistance block, which is a device for measuring soil moisture changes. Its range is in between -100 to < -1500 kpa. Neutron scattering is the technique of choice for condensed matter investigations to measure soil moisture. Its useful range kpa is 0 to < -1500 kpa. Pressure membrane apparatus is used to determine soil water retention and suctions greater than 0.4 bar, and its useful range is 50 to < -10000 kpa.