Classification of Herbicides Based on Time of Application

a) Pre-Planting/ Pre-Sowing

i) EPTC
ii) Monuron
iii) Diuron
iv) Fenuron
v) Sodium Chloride
vi) Arsenic
vii) Boron

b) Per-Emergence :

i). Simazine
ii) Atrazine
iii) Nitrofen
iv) Alachlor
v) Butachlor
vi) EPTC

c) Post-Emergence :

i) 2,4,D
ii) 2,4,5-T
iii) MCPA
iv) MCPB
v) Propanil
vi) Dalapon
vii) Glyphosate
viii) Silvex
ix) MSMA
x)Paraquat

a. Pre-Planting :

These herbicides are applied before a crop is planted are called pre-planting herbicides. The herbicides is usually incorporated into the soil to reduce volatility and photo decomposition. E. g Paraquat , Basalin.

b. Pre- Emergence Herbicides:

Pre-Emergence herbicides is most effective when applied before the emergence of crop and weeds or the term may also refer to herbicides use after weed has emerged or established but before crop emerge E ,g Simazine, Atrazine.

c. Post-Emergence Herbicides:

*Post-Emergence* herbicides are most effective applied after the emergence of crop and weeds or this term may also refer to herbicides use after crop has emerged but before weeds emerge. E. g 2,4-D , Dicamba ( Banvel) etc.
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👉Q.1) Cooperative society is basic institution for:

A.Political growth of the villagers
B.Social growth of the villagers
C. Cultrual growth of the villagers
D.Socio-economic growth of the villagers✅
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👉Q.2) An extension method in which systematic display of models. Specimens, charts, graphs, information, posters, etc. is done in a sequence so as to be significant in teaching or creating interest
among the formers is called:

A.Group contact
B.Campaign
C. Exhibition✅
D.Tour and excursions

👉Q.3) Guava plants bear fruits on:

A.Current seasonal growth✅
B.Spurs
C. Canes
D.Matured hoots

👉Q.4) Law widely used for determining particle size distribution in soils is:

A.Stocke's law✅
B.Darcy's law
C.Schofield's law
D.Fick's law
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Agriculture Quiz Bank By AgriTime.pdf

*Some_important_Terms_used_in_Irrigation*

*Agri Time*


✅# *Hydroscopic_Water* : That water is adsorbed from an atmosphere of water vapour because of attractive forces in the surface of particles.

✅# *Hysteresis* : It is the log of in one of the two associated process or phenomena during reversion.

✅# *Indicator_Plant* : It is the plant, which reflects specific growing condition by its presence or character of growth.

✅# *Infiltration_Rate* : It is the maximum rate at which a soil under given condition and at given time can absorb water when there is no join agriculture exams library telegram channel divergent flow at borders.

✅# *Intake_Rate_or_Infiltration_Velocity* : It is the rate of water entry into the soil expressed as a depth of water per unit area applicable or divergence of flow in the soil.

✅# *Irrigation_Requirement* : It refers to the quantity of water, exclusive of precipitation, required for crop production. This amounts to net ir
requirement plus other economically avoidable losses. It is usually expressed in depth for given time.

✅# *Leaching* : It is removal of soluble material by the passage of water through the soil.

✅# *Leaching_Requirement* : It is the fraction of water entering the soil that must pass through the root zone in order to prevent soil salinity from exceeding a specific value.
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✅# *Oasis_effect* : It is the exchange of heat whereby air over crop is cooled to supply heat for evaporation.

✅# *Percolation* : It is the down word movement of water through the soil.

✅# *Permanent_Wilting_Point (PWP)* : Permanent wilting point is the moisture content in percentage of soil at which nearly all plants wilt and do not recover in a humid dark chamber unless water is added from an outside source. This is lower limit of available moisture range for plant growth ceases completely. The force with which moisture is held by dry soil this point corresponds to 15 atmospheres.

✅# *Permeability* : Permeability is the property of a porous medium to transmit fluids It is a broad term and can be further specified as a hydraulic conductivity and intrinsic permeability.

✅# *PF* : It is the logarithm of height in cm of column of water which represents the total stress with which water is held by soil.

✅# *PH* : It is the negative logarithm of hydrogen ion concentration.
Potential Evaporation: It represents evaporation from a large body of free water surface. It is assumed that, there is no effect oaddictivgr a energy .It is primarily a function of evaporative demand of climate.

✅# *Potential_Evapo_transpiration* : It is the amount of water evaporated in a unit time from short uniform green crop growing actively and covering an extended surface and never short of water. Penman prefers the term potential transpiration.

✅# *Seepage* : It is the water escaped through the soil under gravitational forces.

✅# *Agricultural_Drainage* : It is removal of excess water known as free or ravitational water from the surface or below the surface of farm land to create favorable condition for proper growth and development of the plot.

✅# *Surface_Drainage* : when the excess water saturates the pores agrilearner spaces removal of water of water by downward flow through the soil is called subsurface drainage.

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