Soil Science - Study Mode

[#496] Soil aggregation can be estimated by using
Correct Answer

(A) Yoder's apparatus

Explanation

Solution: Soil aggregation can be estimated by using Yoder’s apparatus. Yoder's apparatus is a wet sieve shaker Machine specially designed for the estimation of soil strength and soil permeability with the help of ASTM stainless steel sieves.

[#497] Land Capability classification is given by
Correct Answer

(D) Klingibiel & Montgomery

Explanation

Solution: Land capability classification is a system of grouping soils primarily based on their capability to produce commonly cultivated crops and pasture plants without deteriorating over a long period. It was given by Klingibiel & Montgomery . It was developed by the USDA (United State Department of Agriculture). It is based on the degree or magnitude of the problem/hazard recognized in the land.

[#498] The active compound in mineral gypsum and phosphogysum is
Correct Answer

(A) Calcium sulphate

Explanation

Solution: The active compound in mineral gypsum and phosphogypsum is Calcium sulphate . Gypsum is a naturally occurring form of calcium sulphate, whereas phosphogypsum is a synthetic form of calcium sulphate, but both contain hydrated forms of calcium sulphate and are used as soil amendment and fertilizers.

[#499] Soil aeration limits plants growth when percent pores filled with water are more than
Correct Answer

(A) 50 - 60%

Explanation

Solution: Soil aeration limits plant growth when the percent of pores filled with water is more than 50 - 60%. Soil aeration can promote root growth and increase the photosynthetic rate and chlorophyll content, therefore promoting plant growth and reducing the plant death rate under salt stress conditions.

[#500] Micronutrients are called micro, because they are
Correct Answer

(C) Needed in small amounts

Explanation

Solution: Micronutrient requirements are in amounts generally less than 100 milligrams per day. There are about seven nutrients essential to plant growth and health that are only needed in very small quantities. Though these are present in only small quantities. Micronutrients are essential dietary elements required by organisms in varying quantities throughout life to orchestrate a range of physiological functions to maintain health.