Red fescue and redtop harvest index

Abstract

Harvest index is an important indicator of seed production efficiency. Its importance is related to dramatic increases of crop yields that occurred in the twentieth century. Harvest index reflects distribution of photosynthates between the grain and the vegetative part of the plant, as well as carbon allocation in grain crop. In an experiment with red fescue and redtop, grain yield in different inter-row sowing distances (20, 40 and 80 cm) in the first and in the second year was observed. Also, production of dry matter through two swaths was measured. Grain yield, as economic, and total biomass, as biological yield were put in relation giving harvest index expressed in percents. Values ranged from 6,98 to 14,76% for red fescue and from 3,01 to 7,93% for redtop.

Žetveni indeks odražava raspodelu produkata fotosinteze između zrna i vegetativnog dela biljke, kao i kretanje ugljenika u semenskom usevu. U ogledu sa crvenim vijukom i belom rosuljom, praćen je prinos semena u prvoj i drugoj žetvenoj godini na različitim međurednim rastojanjima setve (20, 40 i 80 cm međuredno). Merena je i produkcija suve materije kroz dva otkosa. Prinos semena, kao ekonomski, i ukupna biomasa kao biološki prinos stavljani su u odnos, dajući žetveni indeks izražen u procentima. Vrednosti su se kretale od 6,98 do 14,76 % za crveni vijuk, a za belu rosulju od 3,01 do 7,93%.