Вплив строків сівби на площу листкової поверхні гібридів кукурудзи різних груп стиглості / The influence of sowing terms on the area of aleaf surface of corn hybrids of different groups of ripeness
Journal Title: Вісник Львівського національного аграрного університету. Агрономія - Year 2018, Vol 22, Issue
Abstract
The presence of ambiguous thoughts as for the influence of sowing terms on the area of the assimilation surface of corn and significant changes in the climate associated with global warming require the study of the influence of sowing terms on the area of aleaf surface of corn to form the optimal photosynthetic potential of sowing. The results of the study of sowing terms (early on the level of soil temperature at the depth of covering the seeds (RTG) t = + 8 °С, middle (RTG t = + 10 °С) and late (РТГ t = + 12 °С) in corn hybrids of three groups of ripeness (the early-ripe group) – Kharkivskyi 195 MB, DKS 2870, DKS 2960, DKS 2949, DKS 2787, DKS 2971 (st), mid-early group of ripening DKS 3759, DKS 3476, DKS 3795, DKS 3472, DKS 3420, Pereyaslavskyi 230 SV, DKS 3871 (st) and the mid-season group – DK 391, DKS 3511, DK 440, DKS 4964, DKS 4626, DKS 4490 and DK 315 (st)).The results of the conducted researches established the dependence of the productivity of corn plants and the area of leaf surface. The influence on these indicators of sowing terms is noted. Exceeding the indicators of the area of a leaf surface of the second and third sowing terms over the early term is about 10%. Also it is noted the increase in the area of a leaf surface during the lengthening of the growing season. So the largest area of a leaf surface is noted in the mid-early group of hybrids compared with the early forms. Their area of the leaf surface is within the limits of 31,6 – 42,8 thousand m2/ha. Not only the total area of a leaf surface is important for photosynthetic activity, but also the value of the duration of active assimilation, the size of individual tiers of leaves and leaf plates. In particular, the contribution of the upper (flagging) leaf to the total productivity of the plant is about 25 %, and for corn in addition to the area of the upper leaf is important area of the attached leaf. The use of different corn hybrids sowing leads to changes in both total leaf surface area and size of individual tiers of leaves. The most favorable conditions for forming the maximum area of a leaf surface are in the third term of sowing, but the difference in the area of a leaf surface does not exceed 10–15% between the first and third sowing. The most significant increase in the area of a leaf surface in the late sowing term is noted for hybrids of the mid-early and mid-season groups.
Authors and Affiliations
V. Palamarchuk
Keywords
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