1181. The tension of the water at the upper plastic limit is equivalent to pF value:
C. 2.5 – 3.5
1182. The percentage of calcium content in single superphosphate?
1183. Ground water refers to the________?
A. Water quality determination
B. Aquifer location
C. Water regulation
D. Installation of wells
1184. What is the effect of application of P2O5 fertilizer to a green manure leguminous crop in the availability of phosphorus to the succeeding crop?
A. Green manure increases the availability in organic from to the next crop
B. It does not affect the availability of phosphorous to succeeding crop
C. Greater amount of phosphorus is taken up and converted into organic form, which is released on decomposition of green matter
D. It fixes the P2O5 through humus and reduces the availability..
1185. The removal of excess water from the ground surface is called:________?
A. Sub-surface drainage
B. Surface operations
D. All of the above
1186. Rhizoplane is________?
A. An area of soil from root surface to 5 cm
B. Root surface
C. Area within the roots
D. All of them
1187. Which of the following is a component of nucleic acid and protein:
D. None of the above
1188. 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:
A. Hymatomelanic acid & Humin
B. Humic acid & Fulvic acid
C. both A & B
D. None of these
1189. Soil Organic Matter (SOM) serves not only as a reservoir of all the required plant nutrients, but it:
A. Provides energy for the microbial
B. Maintains the productivity of soil
C. Gives structure to the soil
D. All of these
1190. In Pakistan, the major phosphatic fertilizers are:
D. All of Above