Why is % O.M. of the soil used as a basis of N fertilizer recommendation instead of NH4-N and/or NO3-N? Why are different extractants used in the determination of available P in soils? How many kg P/ha is 20 ppm P?

Why is % O.M. of the soil used as a basis of N fertilizer recommendation instead of NH4-N and/or NO3-N? Why are different extractants used in the determination of available P in soils? How many kg P/ha is 20 ppm P?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter2: Soil Deposits-origin, Grain-size, And Shape

Section: Chapter Questions

Problem 2.8P: Redo Problem 2.7 according to the USDA system (Table 2.3). 2.7 The particle characteristics of a...

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Why is % O.M. of the soil used as a basis of N fertilizer recommendation instead of NH₄-N and/or NO₃-N?

Why are different extractants used in the determination of available P in soils?

How many kg P/ha is 20 ppm P?

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xchangeable cation cmolc/kg of soil Ca2+ 2.7 Mg2+ 1.0 K+ 0.1 H+ 1.0 Al3+ 2.8 Na+ 0.1 1) What is the percentage base saturation of this soil? 2) What is the aluminum saturation of this soil? AND 3) How many lbs of aluminum (Al3+) would there be in one acre furrow slice of this soil? Given: 1 AFS soil = 2,000,000 lbs; 1 lb. = 454 g; 1 kg = 2.2 lbs.
Why are different extractants used in the determination of available Phosphorus in soils?
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2. Calculate the CEC of two soils (prairie and forest) assuming that barium (Ba*²) acetate was used to replace all the cations on the soils exchange sites and the barium acetate was replaced with CaCl2. If 5 gram of each soil was used and the Ba?+ concentration in 250 ml (0.250 L) of the final extract was found to be 400 mg Ba*2/L for the prairie soil and 240 mg Ba*2/L for the forest soil, calculate the CEC for each soil.
If you wanted to improve the P availability of your garden soil by adding organic material, would you consider just the P% of the substrate or the substrate’s C:P? Explain why?
Please answer the following questions ASAP. Thanks
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