Agronomy is defined as a branch of agricultural science that deals with the principles and practices of field crop production and what other key element?

When agriculture is viewed as a business, its primary aim is:

Agronomy occupies a pivotal position and is regarded as the mother branch or primary branch of agriculture, having three clear branches: Crop Science, Soil Science, and:

What is the fundamental difference between a seed and a grain, according to the source?

Which classification of seed is the progeny of nucleus seed and is produced by the originating or a sponsored breeder?

Which method of sowing is characterized by the scattering or spreading of seeds on the soil, making it easy, quick, and cheap, though sometimes resulting in uneven distribution?

Which method of sowing involves placing seeds in a hole made at a predetermined spacing and depth, which is laborious and expensive but uses less seed?

What is the approximate optimum depth of sowing range mentioned in the source?

Dry sowing or pre-monsoon sowing is taken up how long before the anticipated receipt of sowing rains?

Who is considered the Father of tillage, having suggested that thorough ploughing is necessary to make the soil into fine particles?

The physical condition of the soil resulting from tillage, described as loose, friable, airy, powdery, granular, and crumbly, is known as:

For irrigated agriculture, what is the desirable size range (in diameter) for a higher percentage of soil aggregates?

What is the deepest operation normally performed during the period between two crops, done to cut and invert the soil?

What type of tillage is carried out immediately after the harvest of a crop to clear off weeds and crop residues and restore soil structure?

The special tillage operation done to cut open/break the subsoil hard pan using a sub soil plough/chisel plough, without inverting the soil, is called:

What is an extreme form of minimum tillage where primary tillage is completely avoided and secondary tillage is restricted to seedbed preparation in the row zone only?

Zero tillage is also referred to as chemical tillage because weeds are controlled using:

In which planting arrangement are plants restricted in their growth habit in order to switch over from the vegetative to the productive phase, often facilitating intercropping?

Which crop geometry is generally preferred for perennial vegetations like trees/shrubs?

What is the practice called when the inter row spacing is reduced between two rows and the spacing between two such pairs are increased, generally done to introduce an inter crop?

What are the three essential criteria for a mineral element to be considered essential, as revised by Arnon (1954)?

Which elements are considered the structural or basic nutrients, constituting 96% of the total dry matter of the plant?

Nitrogen (N), Phosphorus (P), and Potassium (K) are collectively categorized as:

Which beneficial element is essential for the growth of symbiotic microorganisms such as Rhizobia?

Deficiency symptoms of highly mobile nutrients, such as N, P, and K, typically appear first on which part of the plant?

Which essential nutrient has a central role in energy transfer and protein metabolism and is most readily available between a pH of 6 and 7.5?

In well-decomposed Farmyard Manure (FYM), what is the approximate percentage content of N, P2O5, and K2O, respectively?

What is the typical percentage of nitrogen (N) content in Poultry Manure?

In green manuring, what is the optimum stage for turning the crop into the soil to ensure maximum green matter production and succulence?

If 100 kg of Ammonium Sulphate is applied, how much CaCO3 is required for its neutralization (Equivalent Acidity)?

The phosphatic fertilizer known as Single Superphosphate (SSP) contains how much P2O5?

Under flooded or submerged conditions in rice fields, the use efficiency of nitrogenous fertilizers is approximately:

Which natural source of water, other than precipitation, helps in reducing evaporation and transpiration, making crop growth possible even with scanty rainfall (e.g., in North Bihar)?

The upward movement of water above the water table due to capillary movement is greater in which type of soil?

Water accounts for what percentage of the body weight of an actively growing young plant?

Which state in India is noted as having the highest gross irrigated area?

The largest source of irrigation water in India is accounted for by:

Canals constructed by putting some form of barrage across the river and flowing throughout the year are known as:

What is the term used to describe the free water that moves downwards under the force of gravity and is generally not available to plants?

At what soil water tension (in atmospheres) is hygroscopic water held tenaciously, making it non-liquid and immobile, and thus unavailable to plants?

Field capacity denotes the water content retained by an initially saturated soil against the force of gravity, and the commonly accepted soil water tension value for field capacity is:

Which plant is often used as an indicator plant in determining the Permanent Wilting Point?

A soil water tension of 1000 cm of water is equal to a pF value of:

The total soil water potential is the sum of which three potentials?

What is the phenomenon where the soil moisture content at a given suction is greater in desorption (drying) than in sorption (wetting)?

In infiltration rate classification, very clay soils typically have a rate of:

Plants that grow best in moist but aerated soils generally in semi-humid to semi-arid climates, and to which most crop plants belong, are called:

What percentage of evapotranspiration losses does the water utilized by plants in their metabolic activities typically account for?

The period during the growing season when the water use rates are highest (usually 6–10 days) is referred to as:

Reference crop evapotranspiration refers to the evapotranspiration rate from an extended surface of green grass cover of what approximate height?

The total quantity of water required to mature an adequately irrigated crop, including losses and special needs, is called:

What is the approximate water requirement (in mm) for Puddled Rice?

The ratio of the economic crop yield to the amount of water required for crop growing ( $$Y/WR$$ ) is defined as:

In arid and semi-arid regions, what percentage of the average seasonal rainfall is typically assumed to be effective precipitation?

Irrigation scheduling decisions are primarily focused on maximizing crop production per unit of applied water when water is expensive, or maximizing crop production per unit of planted area when:

According to the feel and appearance method for determining soil moisture content, what is the description for a fine textured soil (clay loamy and silty clay loamy) at Field Capacity (100%)?

Which tool is used to measure available water in soils in terms of corresponding range of soil water potential or soil water tension, and is most useful for orchards and vegetable crops on coarse textured soils?

The approach to irrigation scheduling suggested by Prihar et al (1974) that uses Pan Evaporation ( $$E_{pan}$$ ) in a ratio is known as the:

Which growth stage is the most critical for water demand in wheat?

Which type of surface irrigation method involves dividing the field into long parallel strips using small earthen bunds or levees?

The Basin method of irrigation, often adopted for soil submergence, is commonly used for which crop, with an optimum size of 0.25–0.40 ha for efficient water management?

Which specialized irrigation method involves applying water intermittently in a series of short on and off time periods during the irrigation cycle?

Sprinkler irrigation is highly suitable for which type of soil due to its high infiltration rate?

In drip irrigation, the components that control the water drops and the quantity of water delivered at the crop root zone are called:

The harmful effects of saline water on crops increase with an increase in:

As per USDA classification, water with an Electrical Conductivity ( $$EC_{w}$$ ) between 0.75 and 2.25 mhos/cm is classified into which salinity class?

The Sodium Adsorption Ratio (SAR) indicates the relative proportion of sodium to other cations and is used to determine which hazard?

Water with a Residual Sodium Carbonate (RSC) value greater than 2.5 meq/L is considered:

What is the fraction of total crop water requirement that must be leached down below the crop root zone depth to control salts within the crop tolerance level?

In terms of yield losses due to weeds in India, they are generally reported to be:

Which harmful characteristic of weeds is noted for reducing the quality of sugarcane juice?

Weeds that live only for a season or a year and complete their life cycle in that time are classified as:

A parasitic weed that is only partially parasitic, possessing its own chlorophyll and photosynthetic ability (green colour), is known as:

The relationship between two plants (weed/crop, crop/crop, weed/weed) in which the supply of a growth factor falls below their combined demand is known as:

The minimum period of time during which a crop must be free of weeds to prevent yield loss is defined as the:

Which process involves the release of chemicals or exudates by living and decaying plant species that interfere with the germination, growth, or development of another plant species sharing the same habitat?

Which method of weed control involves actions that seek to restrict the spread of weeds and destroy or reduce their population in a given location?

The Stale Seed Bed technique for managing Phalaris minor resistance involves allowing flushes of weeds to sprout, followed by killing them using which type of herbicide?

A herbicide that kills weeds in a germinating or growing crop without harming the crop beyond the point of recovery is defined as:

Which type of herbicide kills only the plant parts covered by the herbicide, has little or no translocation, and is directly toxic to living cells?

Herbicides like Trifluralin and EPTC, which are applied to the soil before the crop is sown and mixed into the soil to prevent loss, are classified by timing of application as:

Which class of herbicides blocks the normal function of the Acetolactate Synthase (ALS) enzyme, essential for amino acid synthesis, causing plants to starve to death?

The mechanism of action for herbicides like 2,4-D and Dicamba (Phenoxy and Benzoic acids) involves:

Which chemical family is Glyphosate classified under, based on its mechanism of action (Inhibitors of EPSP synthesis)?

What is the primary mechanism of selectivity for all pre-emergence herbicides?

The selectivity of Atrazine in sorghum is due to the conjugation of Atrazine in the sorghum leaf by which enzyme?

Allelopathy refers to the beneficial or harmful effects of one plant on another from the release of biochemicals, which are a subset of secondary metabolites known as:

The term 'allelopathy' was first used in 1937 by which Austrian scientist?

What are the two types of allelopathy?

What effect does low fertility typically have on allelopathic effects?

What is the process defined as the irreversible, quantitative increase in size, mass, and/or volume of a plant or its parts, which occurs with an expenditure of metabolic energy?

The environmental factors influencing plant growth are divided into two main groups: biotic factors (living) and abiotic factors (non-living or dead), which include topography and:

What climatic factor primarily influences all plant growth processes, including photosynthesis, respiration, and translocation, and generally allows plants to survive within a range of 0 to 50°C?

The parameter that indicates the rate of growth per unit dry matter, similar to compound interest, is known as:

Who coined the term 'ideotype' in 1968 while working on wheat?

One of the main features proposed by Donald for the wheat ideotype was 'Erect leaves.' What was the physiological rationale for this?

In rice breeding, the concept of plant type was introduced by Jennings (1964), suggesting that an ideal plant type consists of semi dwarf stature, high tillering capacity, and:

For Upland Cotton Ideotype, Singh et al. (1974) proposed a short duration of approximately:

The order in which crops are cultivated on a piece of land over a fixed period, with the objective of maximizing profit without impairing soil fertility, is defined as:

A key principle of crop rotation states that crops with tap roots should be followed by crops that have which type of root system?

An ideal crop rotation aims to reduce the risk of financial loss and pest/disease damage through:

The ratio of the economic yield to the total biological yield, expressed as a percentage, is known as the:

Which symptom indicates physiological maturity in Maize and Sorghum?

What moisture content in the grain is specified as the criteria for harvesting Wheat?