A. Soil
B. Water
C. Volcanic ash
D. Consolidated ash
Correct Answer: Volcanic ash ✔
Last Updated: July 02, 2019
Related MCQs
- Humic acid is soluble in__________?
- In flood rice, snail feed on bacteria called__________?
- Which bacteria convert nitrite to nitrate__________?
- Examples of macrobiota are__________?
- Part of soil which is in contact with root surface is called__________?
- Point of zero change means__________?
- The most abundant metal in the earth’s crust and toxic to plants in low concentration is__________?
- The salinity can be reduced by the application of__________?
- Soil moisture and ET losses are__________?
- Particular matter consists of__________?
- Nitrogen gases are involved in__________?
- A treeless artic plain is called as__________?
- Biochemical reduction of nitrate to nitrite or gaseous nitrogen is called __________?
- While diluting acid always add__________?
- Organic P content in soil, by ignition method is estimated by igniting the soil at __________?
- Boron concentration is irrigation water is considered safe only upto__________?
- The chemical formula for Ammonium acctatc is__________?
- The exact formula for sodium hexametaphosphate is__________?
- Which silica mineral is present in soil in abundant quantity__________?
- TSP contains__________?
- Humic acid is soluble in__________?
- Antioxidant is used to reduce the process of__________?
- Percentage of N in Ammonium ritract fertilizer is__________?
- Sewage water consists of water and solids in the following percentage__________?
- Clear water with organic matter or sediment and minimum biological activity is known as__________?
- Deficiency of B can be corrected through application of chemical fertilizer of__________?
- Rocks formed from molten magma are called__________?
- Material deposited by the wind is called__________?
- The wearing away of the land surface by wind, water, ice or other geological agents is called__________?
- The science of growing terrestrial plants in an aerated solution is known as__________?
- Electrical conductivity of saturated paste is written as__________?
- Na2CO3 salts is__________?
- Accumulation of soluble salts root zone is known as__________?
- The atmospheric layer lies closest to the earth surface is known as__________?
- Algal photosynthesis increases pH of water and releases__________?
- Primary air pollution is__________?
- Perfect hardness of any mineral is determined by__________?
- The water loss through transpiration from vegetative and evaporation from soil surface is known as__________?
- Soil structure without aggregation is known as__________?
- The device used for the measurement of positive pressure potential of soil water is known as__________?
- The safe limit of No2 in drinking water is__________?
- The particlesw density of a mineral soil is about__________?
- Deep percolation from a soil profile is generally measured by a device known as__________?
- Auxins promote__________?
- The chemical formula of Dolomite is__________?
- The toxicity level of Zn (mg/kg) in plants suggested by some workers is__________?
- The exact formula for calculating the base saturation percentage is__________?
- The EC: SAR and RSC values suggested by WAPDA for 3rd class irrigation water(C,S,R,) are__________?
- According to WAPDA, the ECe of the salt free soil should remain__________?
- The exact chemical formula of DAP fertilizer is__________?
- Nitrification is the microbial conversion of__________?