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Base-cation saturation ratio (BCSR) is a method of interpreting soil test results that is widely used in sustainable agriculture, supported by the National Sustainable Agriculture Information Service (ATTRA) [1] and claimed to be successfully in use on over a million acres (4,000 km 2) of farmland worldwide.
A benefit–cost ratio [1] (BCR) is an indicator, used in cost–benefit analysis, that attempts to summarize the overall value for money of a project or proposal. A BCR is the ratio of the benefits of a project or proposal, expressed in monetary terms, relative to its costs, also expressed in monetary terms.
The sodium adsorption ratio (SAR) is an irrigation water quality parameter used in the management of sodium-affected soils. It is an indicator of the suitability of water for use in agricultural irrigation , as determined from the concentrations of the main alkaline and earth alkaline cations present in the water.
The land equivalent ratio can be used whenever more than one type of yield can be obtained from the same area. This can be intercropping of annual crops (e.g. sorghum and pigeonpea ) [ 1 ] or combination of annual and perennial crops e.g. in agroforestry systems (e.g. jackfruit and eggplant ).
Being a ratio the FCR is dimensionless, that is, it is not affected by the units of measurement used to determine the FCR. [ 3 ] FCR a function of the animal's genetics [ 4 ] and age, [ 5 ] the quality and ingredients of the feed, [ 5 ] and the conditions in which the animal is kept, [ 1 ] [ 6 ] and storage and use of the feed by the farmworkers.
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By multiplying Y(II) by the irradiation light level in the PAR range (400 nm to 700 nm) in μmols, multiplied by the average ratio of light absorbed by the leaf 0.84, and multiplied by the average ratio of PSII reaction centers to PSI reaction centers, 0.50, [5] [14] [15] relative ETR measurement is achieved. [16]
It is the surface area to volume ratio (specific surface area) of soil particles and the unbalanced ionic electric charges within those that determine their role in the fertility of soil, as measured by its cation exchange capacity. [11] [12] Sand is least active, having the least specific surface area, followed by silt; clay is the most active.
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