Photosynthetic productivity of sugar beet depending on periods of sowing and fertilizer system

Abstract

The purpose. To determine influence of periods of sowing and fertilizer system on indexes of photosynthetic activity of plants of sugar beet. Methods. Field, laboratory, registration-weight. The square of leaves, photosynthetic potential, net productivity of photosynthesis were determined according to growth phases. Results. Influence of periods of sowing and fertilizers is determined on the square of leaves, photosynthetic potential, mass of dry matters, and net productivity of photosynthesis. Conclusions. The square of leaves changes a little as a function of periods of sowing, and under the influence of fertilizers it increases in 2 times. Net productivity of photosynthesis is augmented at early periods of sowing (March, 20 — April, 10) and less depends on the level of fertilizing.