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- W2000375052 abstract "A simple framework for describing the partitioning of biomass among the organs (root, stem, laminae, head) of sunflower plants between emergence and anthesis as been developed using data from experiments in which adequate water and nitrogen supplies were assured. It was hypothesized that organ partitioning coefficients (the slope of the organ weight: total weight relationship) remained constant during phenologically defined phases of crop development. A non-linear optimization routine was used to define organ partitioning coefficients and the values of total plant weight at which changes in partitioning took place. It proved possible to relate these values to defined stages of plant development, namely bud visible and commencement of rapid head growth. The dynamics of partitioning to the stem could be described by two coefficients applying to the emergence-bud visible and bud visible-anthesis phases, respectively. Complementary changes in the coefficients for leaf laminae and fine roots took place at the bud visible stage. Once rapid growth of the inflorescence had become established, further changes in partitioning to roots and laminae, but not to stem, took place. Values of the coefficients for each organ changed only slightly between experiments (three) and cultivars (five), in spite of substantial variations, between data sets, of total plant weight at anthesis and, to a lesser extent, in the timing of the anthesis and bud visible stages. A satisfactory description of organ biomass dynamics was obtained when this descriptive framework was tested against data obtained in an independent experiment." @default.
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- W2000375052 date "1994-06-01" @default.
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- W2000375052 title "Pre-anthesis partitioning of dry matter in sunflower (Helianthus annuus L.) crops" @default.
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- W2000375052 doi "https://doi.org/10.1016/0378-4290(94)90102-3" @default.
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