Some of the problems associated with intensive irrigationinclude all of the following except(A) soil salinization.(B) overfertilization.(C) land subsidence.(D) aquifer depletion.
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Some of the problems associated with intensive irrigation
include all of the following except
(A) soil salinization.
(B) overfertilization.
(C) land subsidence.
(D) aquifer depletion.
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- Fertile soil is one of the keys to good yield. (i) Explain the roles of clay and organic matter in contributing to soil fertility and cation exchange capacity (CEC). (ii) Name ONE (1) negative effect of low CEC and high CEC soils respectively. Suggest ways to improve low CEC and high CEC soils. (iii) Suggest ONE (1) suitable type of crops for high CEC soil, low CEC soil and loam soil respectively.What process adds water until the water table rises and envelops the deep roots of plants, resulting in a loss of productivity and ultimately killing them? Options A.) Salinization B.) Desertification C.) Soil crosion D.) Overgrazing E.) WaterloggingExplain why you are for or against: (a)raising the price of water while providing lower lifeline rates for the poor consumers, (b)withdrawing government subsidies that provide farmers with water at low cost, and (c)providing government subsidies to farmers for improving irrigation efficiency.
- Which problem does the prolonged liberal irrigation of agricultural fields create?It is June in Fresno and the officials at the water district have just reduced your irrigation ration by 26%. In the field, you determine that the water potential in your soil is -1.68 MPa while the water potential of your crop is -1.62 MPa. Question A. Is your crop able to take up water from the soil? Explain. Question B. It is now late August and your soil water potential is -2.10 MPa, fortunately, you have been granted one magic wish in altering the physiology of your crop to increase its ability to take up water, however, you must choose from one of the options below. Fill in the values denoted by the ? as needed, and select the option that will cause the greatest water uptake by your crop. Option Vs (MPa) Vp (MPa) Vw (MPa) -1.90 0.00 -2.59 +0.13 -2.4 -2.09 -2.05 -2.28 +0.17 4.Name the following as soil forming processes: a. Soil erosion b. Formation of humus c. Weathering of sand d. Nutrients absorbed by plant roots e. deposition of organic matter f. Leaching of water along with dissolved ions
- In some circumstances, grasses that initially lose tissues from being consumed by animals such as elk or cattle regrow more than they would have otherwise, and benefit from the moderate levels of grazing. Which of the following terms would best describe such a plant-herbivore interaction?a) Commensalismb) Mutualismc) Predationd) ParasitismThe practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Why would nitrogen-fixing plants be plowed under instead of harvested? a) To increases usable nitrogen in the soil. b) To increase water retention. c) Nitrogen-fixing plants are not a food crop. d) To decrease bacteria in the soil.(c) (1) capacity of the soil. (ii) State FOUR ways in which soil is important to living organisms.
- Drought is the main constraint for agriculture sector. What is the major consequence of water insufficiency in plant? *The practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Which of the following is not an abiotic factor that affects plants being used in crop rotation? a) NH3 availability b) Soil temperature c) Herbivore density d) Oxygen concentrationSoil characterisation could help to determine soil type and soil health. Relate cation exchange capacity (CEC) with soil health and explain the roles of clay and organic matter in contributing to CEC. (i) What would you recommend to improve soils with low CEC and high CEC? Name ONE (1) negative effect of low CEC and high CEC soils, respectively. (ii) (ii) Suggest a suitable soil type for rice, oil palm and durian, respectively.