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  2. Plant growth analysis - Wikipedia

    en.wikipedia.org/wiki/Plant_growth_analysis

    The LAR can be further subdivided into two other variables that are relevant for plant biology: Specific leaf area (SLA) and Leaf Mass Fraction (LMF). SLA is the leaf area of a plant (or a given leaf) divided by leaf mass. LMF characterizes the fraction of total plant biomass that is allocated to leaves. In formula: = . .

  3. Sum of perpetuities method - Wikipedia

    en.wikipedia.org/wiki/Sum_of_Perpetuities_Method

    SPM is derived from the compound interest formula via the present value of a perpetuity equation. The derivation requires the additional variables X {\displaystyle X} and R {\displaystyle R} , where X {\displaystyle X} is a company's retained earnings, and R {\displaystyle R} is a company's rate of return on equity.

  4. Land equivalent ratio - Wikipedia

    en.wikipedia.org/wiki/Land_equivalent_ratio

    Land equivalent ratio. The FAO defines land equivalent ratio (LER) as: [2] the ratio of the area under sole cropping to the area under intercropping needed to give equal amounts of yield at the same management level. It is the sum of the fractions of the intercropped yields divided by the sole-crop yields.

  5. Tree crown measurement - Wikipedia

    en.wikipedia.org/wiki/Tree_crown_measurement

    Alternatively, the crown area can be measured and crown spread calculated from that value. EasyAcreage [8] is a Google Earth area measurement tool that calculates the area of any shape outlined on the Google Earth display. The perimeter of the tree can be traced on a satellite photo, and the software will calculate the area.

  6. Leibniz formula for π - Wikipedia

    en.wikipedia.org/wiki/Leibniz_formula_for_π

    The formula is a special case of the Euler–Boole summation formula for alternating series, providing yet another example of a convergence acceleration technique that can be applied to the Leibniz series. In 1992, Jonathan Borwein and Mark Limber used the first thousand Euler numbers to calculate π to 5,263 decimal places with the Leibniz ...

  7. Scientists explore how to improve crop yields - on Mars - AOL

    www.aol.com/news/scientists-explore-improve-crop...

    By Will Dunham (Reuters) - For future human bases or colonies on Mars to be self-sustaining, a reliable source of home-grown food will be a must.

  8. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    More formulas of this nature can be given, as explained by Ramanujan's theory of elliptic functions to alternative bases. Perhaps the most notable hypergeometric inversions are the following two examples, involving the Ramanujan tau function τ {\displaystyle \tau } and the Fourier coefficients j {\displaystyle \mathrm {j} } of the J-invariant ...

  9. How to calculate the present and future value of annuities - AOL

    www.aol.com/finance/calculate-present-future...

    Therefore, the future value of your annuity due with $1,000 annual payments at a 5 percent interest rate for five years would be about $5,801.91.