Nitrification is the microbial conversion of _____?
A. NH nitrogen the NO3 nitrogen in soil
B. NO2 to NO3 nitrogen in soil
C. NO3 nitrogen to NH4 + in soil
D. None of the above
The exact chemical formula of DAP fertilizer is _______?
A. (NH2) HPO4
B. NH4H2PO4
C. NH4H2PO4
D. Both a & c
According to WAPDA, the ECe of the salt free soil should remain ____?
A. < 4 dsm-1
B. Equal to 4 dsm-1
C. 4-8 dsm-1
D. None of the above
The EC: SAR and RSC values suggested by WAPDA for 3rd class irrigation water(C,S,R,) are ______?
A. ECi:<1.5, SAR < 10 & RSC< 2.5
B. ECi:>1.5, SAR > 10 & RSC> 2.5
C. ECi:>1.5, SAR 2.5
D. Both a & b
The exact formula for calculating the base saturation percentage is ________?
A. Bas saturation percentage = CA+Mg+Na / CEC x 100
B. Bas saturation percentage = /CEC / CA+Mg+Na x 100
C. Bas saturation percentage = /CEC / CA+Mg x 100
D. None of the above
The toxicity level of Zn (mg/kg) in plants suggested by some workers is ___?
A. > 50 mg kg-1
B. > 10 mg-1
C. > 400 mg kg-1
D. None of these
The chemical formula of Dolomite is _____?
A. CaMg (CO3)2
B. MgCO3
C. CaCO3
D. None of the above
Auxins promote _____?
A. Cell elongation
B. Cell division
C. Both a & b
D. None of the above
Deep percolation from a soil profile is generally measured by a device known as ____?
A. Hydrometer
B. Lysimeter
C. Thermometer
D. Tensiometer
The particlesw density of a mineral soil is about ______?
A. 2750 Kg m-3
B. 2550 Kg m-3
C. 2650 Kg m-3
D. None of the above
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