The yielding capacity and plant stand of fiber flax with respect to the plant stand density before harvesting

Abstract

The fiber flax yielding capacity and plant stand prove to be the factors affecting the choice of the operation regimes of flax harvesters, whereas the changes and variability of morphological characters of stalks compli-cates their technological adjustment, thus making it impossible to use mechanization means under preparing and harvesting dew retted flax straw.

The yielding capacity of fiber flax is characterized by the crop seed and straw yield and long fiber count, as well as the fant stand before harvesting – by its equalization capacity, flax box formation character and the part of non-productive stalks in it. The dimensional characteristics of stalks are evaluated by the mean square deviations and the variation coefficients of the corresponding morphological characters.

The paper suggests the changes in the fiber flax seed and straw yielding capacity, in the count of long fi-ber and plant stand equalization depending on the plant stand density before harvesting. These changes are presented in the form of the corresponding graphs and correlation and repression equations. Depending on the plant stand density the change in the fiber flax seed and straw yielding capacity and the count of long fiber are described by the convex parabolas of the second order, and the equalization capacity of plant stand with re-spect to the plant height – by the gradually rising hyperbola. The author determines the optimal plant stand density that maximizes flax produce yielding capacity and the quality of fiber component of fiber flax yield.

The paper highlights the effects of the plant stand density before harvesting on the changes in the flax box formation capacity, the part of non-productive stalks in it, the mean square deviation of flax box formation, the coefficients of variation of height and diameter of stalks. The author investigates the changes in the mass of plants with ramified inflorescences, flax boxes with seeds and the mass of the hackled stalk and seed on the stalk depending on the stand density. Depending on the plant stand density the change in the part of non-productive stalks in it is described by the gradually rising hyperbola, and the rest of the investigated characters and their statistical indices – by the equations of gradually falling hyperbolas with specified parameters of these hyperbolas.

The indices of variability of the stalk and plant stand dimensional characters can be used for determining and substantiating adjustments in the combine hackling unit.