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Soil Science Quiz 7

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Soil Science Quiz 7

1 / 50

Which rock contain potash feldspar ?

2 / 50

The soil samples are dried at _______________, for gravimetric soil analysis?

3 / 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:

4 / 50

In Balochistan, deserts also exists in _________, which supoorts wind erosion excluding rocky mountains:

5 / 50

The aggregation of individual particles is called___________________?

6 / 50

Humic acid is soluble in________?

7 / 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:

8 / 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:

9 / 50

Sewage water consists of water and solids in the following percentage___________________?

10 / 50

The percentage of calcium content in single superphosphate?

11 / 50

swelling clay soils, develop cracks due to greater proportion of swelling type clays:

12 / 50

Deficiency of B can be corrected through application of chemical fertilizer of_________________?

13 / 50

DAP fertilizer available in Pakistan contains______________?

14 / 50

All the SSP and some nitrophos are are manufactured locally by the National Fertilizer Corporation (NFC): SSP at_________?

15 / 50

Soil particles having diameter greater than 2 mm are called___________________?

16 / 50

Igneous rocks are called:__________?

17 / 50

A soil with an ESP greater than 15 is usually classified as___________________?

18 / 50

Which type of soil is found near the canal banks:

19 / 50

Which element can be fixed by smecitite___________________?

20 / 50

Color of fertile soil is_________?

21 / 50

Problem of erosion in Thal and Cholistan is due to________?

22 / 50

Ca, Mg, S are called__________?

23 / 50

Nitrogen fixation is accomplished by:_________?

24 / 50

Ground water refers to the________?

25 / 50

Walkley and blacks method of organic matter determination allows recovery of ______ ? organic carbon content:

26 / 50

Organic matter decomposes rapidly in Pakistani soils because of ____________ conditions, that is why our soils generally have < 1% organic matter:

27 / 50

[(NH4)2SO4FeSO66H2O] is the formula of ___________?

28 / 50

Father of soil conservation and Father of Pedology respectively?

29 / 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?

30 / 50

Nutritive elements needed in large quantities to ensure normal plant development:

31 / 50

Addition of sodium hexametaphosphate in soil for determination of soil texture causes__________________?

32 / 50

_________is probably the most important growth limiting factor in acid soils especially those having pH below 5.0-5.5?

33 / 50

The diagnostic techniques used in evaluating soil nutrient status and determining fertilizer requirements of the crop include:

34 / 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:

35 / 50

Soil particles as individuals such as sand and do not form aggregates. These are usually found in parent material or C horizon is:_________?

36 / 50

In flood rice, snail feed on bacteria called__________________?

37 / 50

Who characterized soil formation as set of ?4? process__________?

38 / 50

Pedogenic processes bring about changes in the parent materials in the form of _________, within the soil body (soil profile)?

39 / 50

The toxicity level of Zn (mg/kg) in plants suggested by some workers is___________________?

40 / 50

The unique soil environment under the influence of plants roots is called rhizosphere and this term was given by__________?

41 / 50

pH of Pakistani soils is________?

42 / 50

Cyclic salts are mostly of __________?

43 / 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__________________?

44 / 50

AAS stands for:___________?

45 / 50

Fossils are found in__________type of rocks:

46 / 50

Who gave the equation for study of soil property ?

47 / 50

?A? horizon of the soil is also designated:

48 / 50

The available form of calcium to plant is________________?

49 / 50

Organic P content in soil, by ignition method is estimated by igniting the soil at ________?

50 / 50

In Pakistan, the major phosphatic fertilizers are:

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