Agriculture Reference
In-Depth Information
•
FAO Irri. and drainage Paper 48 (The use of saline waters for crop production)
[1993]
•
FAO Irri. and drainage Paper 29 (Water quality for agriculture) [1976]
FAO Soils Bulletins
- FAO Soils Bulletin No. 39 (Salt-affected soils and their management) [1998]
Questions
(1) Narrate the extent of salinity problem. Why the process of soil salinization is
important to know?
(2) Describe the process of soil salinization.
(3) What are the factors affecting salinity problem?
(4) Briefly describe the characteristics of salt-affected soils.
(5) Write a short note on: EC, TSS, ESP, CEC, SAR.
(6) Discuss the field and laboratory methods for diagnosis of saline and sodic soil.
(7) How will you determine the intensity of salinity and sodicity hazard?
(8) How will you interpret (a) the salinity hazard based on EC, (b) sodicity hazard
based on Na, SAR, ESP and Ca:Na ratio?
(9) Classify salinity based on different approaches.
(10) What are the impacts of (a) salinity, and (b) sodicity on soil and plant growth
and crop production?
(11) Describe the factors influencing tolerant to crop.
(12) What are the principles for management of saline soil?
(13) Briefly describe the different approaches to ameliorate the salinity effect.
(14) What is leaching fraction (LF)? What points should be considered in leaching
process?
(15) Write down the mathematical formula for determining LF under different
perspectives.
(16) Write down the mathematical formula for determining total water requirement
for crop evapotranspiration and leaching.
(17) Discuss the management methods of (a) saline, (b) sodic, and (c) saline - sodic
soils.
(18) Write down the names of some models/tools available for salinity manage-
ment.
(19) A canal water has the salinity level 5.0 dS/m. The groundwater salinity level
at that area is 20 dS/m, which is not suitable for irrigation. Find out the mixing
ratio of canal water to groundwater to lower the salinity to 12.0 dS/m.
(20) The electrical conductivity (EC) of a maize field during its growth period was
found 9.0 dS/m. Estimate yield reduction due to salinity, if the maize cultivar
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