177-182 Flashcards
What is the ultimate source of nitrogen?
The atmosphere.
What is the immediate source of nitrogen?
Organic matter.
What type of residual nature do nitrate fertilizers have?
Basic residual nature.
What are ammonical fertilizers suitable for?
Waterlogged soils.
What is the most commonly used N-fertilizer in India?
Urea
What is the maximum concentration of biuret allowed in urea for foliar spray on crops?
0.0025
What is the process of loss of gaseous nitrogen by biological reduction of nitrate and nitrite known as?
Denitrification.
What is the leaching or drainage loss of nitrogen mostly associated with?
Nitrate fertilizer.
What is the function of nitrification inhibitors?
They decrease the activity of nitrifying bacteria.
What are the two types of compounds used to reduce the solubility of nitrogen fertilizer in slow-release fertilizers?
Synthesizing compound and coating barrier.
What is the trade name of urea & ammonium phosphate grade 29:29:0?
GROMOR.
Which state has the highest consumption of N & P?
UP.
What is the most common and cheap fertilizer among potassic fertilizers?
Potassium chloride (KCL).
Which fertilizer is not suitable for alkaline soils?
Potassic fertilizer.
What is the most commonly used fertilizer to control iron chlorosis in crops like groundnut and soybean?
Ferrous sulphate.
Which fertilizer is used as a seed treatment due to its high zinc oxide content?
Zinc oxide.
What is the function of Gypsum ($CaSO_4 2H_2O$) in agriculture?
It is used for sulphur and calcium requirements in crops like onion
At what rate is Gypsum used for the reclamation of alkali soil?
800 kg/ha.
What is the significance of applying phosphorus fertilizers as a basal dose?
Phosphorus fertilizers have a slow release nature
In which type of soil is Rock phosphate and SSP preferred over DAP?
Acidic soils.
Why are ammonical fertilizers not recommended for saline & alkali soils?
Because alkalization of ammonia takes place in these soils.
Which nutrients are Indian soils universally deficient in?
Nitrogen and Zinc.
What does fertilizer grade indicate?
The percentage of plant nutrients in a fertilizer.
What is the function of AM & N-serve?
They are nitrification inhibitors.
What is the most commonly used zinc fertilizer?
Zinc sulphate.
Which fertilizer is used for boron frits due to its high solubility in water?
Borax.
What is the significance of applying ammonium molybdate to pulses?
It is a constituent of leghaemoglobin and is important for nitrogen fixation in pulses.
What is the agriculture grade of Gypsum?
0.7
What is the purpose of applying fertilizers/pesticides at the time of sowing?
To provide essential nutrients to the crop from the early stages of growth.
Why are phosphorus fertilizers applied at basal dose?
Due to their slow release nature.
What is the advantage of deep placement of fertilizer in paddy?
It helps to prevent leaching and volatilization losses.
What is the recommended ratio for NPK application in legume and vegetable seedlings at transplanting as a starter dose?
1:2:1.
How many split doses of N fertilizer are recommended for crops with a duration of 4-5 months?
2 split doses.
Which fertilizer is preferred for rice crop?
Ammonium sulphate.
Which bacteria is responsible for the conversion of ammonium to nitrite?
Nitrosomonas.
What is the nitrogen percentage in Thiourea?
36.8%.
What is the relationship between $\%P_{2}O_{5}$ and $\%P$?
$\%P_{2}O_{5} = \%P \times 2.29$
Which method is used to extract phosphorus in acidic soils?
Bray No. 1.
Which state has the highest use of potassic fertilizer?
Maharashtra.
Why should KCL not be used in sugarcane
sugar beet
What is the relationship between $\%K_{2}O$ and $\%K$?
$\%K_{2}O = \%K \times 1.20$
What is the significance of $Ar_k$?
It measures the intensity of labile K in the soil and represents the K that is immediately available to crop roots.
How is K & Na determined?
By Flame photometer.
Which micronutrient fertilizer is used to control iron chlorosis in crops like groundnut and soybean?
Ferrous sulphate.
What is the most popular manganese fertilizer?
Manganese sulphate.
Which zinc fertilizer is applied both to soil and plant?
Zinc sulphate.
What is the boron content in borax?
0.11
Which micronutrient fertilizer is used as a foliar spray in pulses and why?
Ammonium molybdate
How many split doses of nitrogen are recommended for cereal crops with a 4-5 month duration?
2 split doses.
How many split doses of nitrogen are recommended for crops with a duration longer than five months?
3 split doses.
Which potassic fertilizer is preferred when crop quality is important?
Potassium sulphate.
Which nitrogen fertilizer is best for rice crops?
Ammonium sulphate.
In acidic soils
which phosphorus fertilizers are preferred over DAP?
Why are ammonical fertilizers not recommended for saline and alkali soils?
Because alkalization of ammonia takes place.
Which nutrients are Indian soils universally deficient in?
Nitrogen and Zinc.
What does fertilizer grade indicate?
The percentage of plant nutrients in a fertilizer.
What is the fertilizer ratio?
The relative proportion of three major plant nutrients (NPK).
Which nitrogen fertilizer is best suited for waterlogged soils?
Ammonium sulphate.
What is the most common and cheap potassic fertilizer?
Potassium chloride or Murate of potash.
Which bacteria are responsible for denitrification?
Pseudomonas and Bacillus.
