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.
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- Soil 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.(c) (1) capacity of the soil. (ii) State FOUR ways in which soil is important to living organisms.Describe in brief the characteristics of clay and loam soils. Provide ONE (1) example of plant that is suitable for each type of soil. *
- (i) What does high cation exchange capacity (CEC) mean in a particular soil and what are the components in soil that determine the CEC level? (ii) Explain the processes of CEC in soil and provide examples of anionic minerals of plants.Draw the NPK economy by showing how these nutrients are being added and lost in the soil system (Just a simple illustration-Boxes and Arrows with labels/descriptions - is enough to illustrate the soil nutrient economy) Each of the soil nutrient, N-P-K, should have a separate hand-drawings. Thus, there will be three (3) drawings.What are the functions of soils in a rice field, and suggest management activities to maintain a healthy soil (a soil that can fully provide its full potential or function both to the plants and animals and the environment).
- 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.You have been presented with leaf samples with various nutrient deficiency symptoms shown below. (i) Identify missing nutrients of a, b, c, and d based on Figure 2 below. b Maine Organic Farmers and Gardeners Association University of Massachusetts, Amherst d Allotment Garden Cellmax Nutrients Figure 2: Nutrient deficiency symptoms of tomato Where would you expect to find symptoms of nutrient deficiency for mobile and immobile nutrients? Also, determine the mobility of missing nutrients identified in Question 2 b) (i). (ii)Briefly discuss/ explain the influence of soil pH and Cation Exchange Capacity (CEC) on nutrient retention and nutrient availability.
- During the formation (genesis) of a soil from parent material, the regolith undergoes many profound changes, which are brought about by variations of four broad soil-forming processes. Explain how these changes are induced by the four main soil-forming processes.Micronutrient deficiency is, or may be:Group of answer choices A.) pH dependent B.) affected by excess macro and secondary nutrients. C.) Is not as typical in acidic soil environments as in alkaline soil environments. D.) All of the aboveCation Exchange capacity is: Group of answer choices a. The amount of cations that can be held by a given mass of soil. b. Affected by soil texture c. Affected by the amount of organic matter/Humus in a soil. d. Affected by the amount of clay in a given soil e) All of the above