Soil Science MCQ Question and Answer | Agriculture MCQ Question

Barley is a small grain crop that has exceptional tolerance to law leaves of soil copper supply. Ears of copper deficient plants are often trapped in the sheath and emerge with white tips and blind spikelets plants show dry, white and twisted tips. Young leaves wilt on their tips whereas the basal leaves remain dark green.

Calcium chloride (CaCl₂) is the chemical used as an extractant during Sulphur estimation by Chesnin & Yein method.
Chesnin & Yein has given knowledge of spatial variability of soil properties, the spatial distribution of specific organic matter, and nutrient management like available Sulphur or available potassium and many other essential plant elements.

The external surface area of 1 g of colloidal clay is at least 1000 times that of 1 g of coarse sand. This is because of the small size of the clay particles whereas the size of the sand is quite bigger than clay.
Particles less than 0.001 mm in size possess colloidal properties and are known as soil colloids and these are the finer size fractions of the clay soil.

Capillary pores are the microscopic channels within hydrated paste that will draw liquid water due to surface tension. Capillary pores are at least 1 μm in diameter and it is in the range of less than 15 μ.
Capillary porosity is determined by finding the volume of water retained in the soil at 50 cm tension.

The survey is the method that will be followed to gather information in the case where information is unavailable for research purposes.
The survey is a research method for collecting data from a predefined group of respondents to gain information and insights into various topics of interest.

The soil of our country is rich in clay particles and has a neutral to slightly alkaline reaction.
The soil is rich in bases, lime and calcium.
Almost 95% of Indian soil type is low or medium in Phosphorus. Approx. 49.3% of districts and Union territories are low in available P, 48.8% are medium and only 1.9% are high.

2 : 1 : 1 type of clay mineral contains an extra sheet of Brucite as compared to the 2 : 1 type of clay minerals.
Brucite is the mineral form of magnesium hydroxide and is a common alteration product of periclase in marble. It adopts a layered Cdl₂- like structure with hydrogen bonds between the layers.

Soil puddling is the process of working saturated or near saturated soil into soft structureless mud. In simple words, it can be called tillage in rice while flooded.
The main objective of puddling in paddy plantations is to create an impermeable layer in the soil, which is the first requirement of submerged plantations in paddy. It reduces the percolation rates of water by churning clay particles and making them close many soil pores.

There are overall 17 essential nutrients required by the plants for proper growth and development. Out of them, 10 are macronutrients that are required in large amounts whereas 7 are micronutrients that are required in traces.
Boron, Zinc, Manganese, Copper, Molybdenum, iron and chlorine are micronutrients.

Green manures are the crops specifically produced to be incorporated into the soil while still green. The main aim is to add organic matter to the soil for its benefit. Green manuring is mostly used with legume crops to add nutrients to the soil, especially in organic farming.
Phosphatic fertilizers enhance the manuring properties of green manures.