Soil Science Quiz 7
1 / 50
Humic acid is soluble in________?
2 / 50
Ca, Mg, S are called__________?
3 / 50
Color of fertile soil is_________?
4 / 50
[(NH4)2SO4FeSO66H2O] is the formula of ___________?
5 / 50
Soil-forming minerals occurring in rocks do not contain any water, they undergo ______________ when exposed to humid conditions & break down as in chemical weathering process:
6 / 50
DAP fertilizer available in Pakistan contains______________?
7 / 50
The conductivity of a saturation extract is greater 4 dsm-1 an exchangeable sodium percentage (ESP) of less than 15 and the pH is usually less than 8.5 is called as__________________?
8 / 50
Walkley and blacks method of organic matter determination allows recovery of ______ ? organic carbon content:
9 / 50
Organic matter decomposes rapidly in Pakistani soils because of ____________ conditions, that is why our soils generally have < 1% organic matter:
10 / 50
The aggregation of individual particles is called___________________?
11 / 50
Organic P content in soil, by ignition method is estimated by igniting the soil at ________?
12 / 50
Any material such as straw, sawdust, leaves, plastic films, & loose soil that is spread upon the surface of the soil to protect the soil & plant roots from the effects of raindrops, soil crusting, freezing or evaporation:
13 / 50
Father of soil conservation and Father of Pedology respectively?
14 / 50
pH of Pakistani soils is________?
15 / 50
Soil particles having diameter greater than 2 mm are called___________________?
16 / 50
Addition of sodium hexametaphosphate in soil for determination of soil texture causes__________________?
17 / 50
_________is probably the most important growth limiting factor in acid soils especially those having pH below 5.0-5.5?
18 / 50
AAS stands for:___________?
19 / 50
In flood rice, snail feed on bacteria called__________________?
20 / 50
Who characterized soil formation as set of ?4? process__________?
21 / 50
A soil with an ESP greater than 15 is usually classified as___________________?
22 / 50
Fossils are found in__________type of rocks:
23 / 50
The diagnostic techniques used in evaluating soil nutrient status and determining fertilizer requirements of the crop include:
24 / 50
Problem of erosion in Thal and Cholistan is due to________?
25 / 50
In Pakistan, the major phosphatic fertilizers are:
26 / 50
The toxicity level of Zn (mg/kg) in plants suggested by some workers is___________________?
27 / 50
The percentage of calcium content in single superphosphate?
28 / 50
Humus generally refers to the decomposed organic residues which have undergone a series of degradation and synthesis cycles. The humic substances consist of a series of highly acidic, yellow to black coloured, high molecular weight compounds __________________, which can be separated using different extraction procedures:
29 / 50
swelling clay soils, develop cracks due to greater proportion of swelling type clays:
30 / 50
Weathering process-physical, chemical, and biological _______________, the rocks and minerals into simpler products which either accumulate in place or are transported to other places where they become soil parent materials?
31 / 50
Soil particles as individuals such as sand and do not form aggregates. These are usually found in parent material or C horizon is:_________?
32 / 50
Deficiency of B can be corrected through application of chemical fertilizer of_________________?
33 / 50
The unique soil environment under the influence of plants roots is called rhizosphere and this term was given by__________?
34 / 50
Sewage water consists of water and solids in the following percentage___________________?
35 / 50
Which type of soil is found near the canal banks:
36 / 50
Nitrogen fixation is accomplished by:_________?
37 / 50
The soil samples are dried at _______________, for gravimetric soil analysis?
38 / 50
Who gave the equation for study of soil property ?
39 / 50
Pedogenic processes bring about changes in the parent materials in the form of _________, within the soil body (soil profile)?
40 / 50
The available form of calcium to plant is________________?
41 / 50
Cyclic salts are mostly of __________?
42 / 50
Which element can be fixed by smecitite___________________?
43 / 50
All the SSP and some nitrophos are are manufactured locally by the National Fertilizer Corporation (NFC): SSP at_________?
44 / 50
Ground water refers to the________?
45 / 50
In Balochistan, deserts also exists in _________, which supoorts wind erosion excluding rocky mountains:
46 / 50
47 / 50
Igneous rocks are called:__________?
48 / 50
Nutritive elements needed in large quantities to ensure normal plant development:
49 / 50
Which rock contain potash feldspar ?
50 / 50
?A? horizon of the soil is also designated:
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