Defective broomcorn [Sorghum bicolor (L.) Moench] panicle in relation to vegetative space per plant

Abstract

Field trial was set up in Šajkaš in 2002 and 2003 to estimate influence of vegetative space per plant on formation of defective broomcorn panicle (spike, crooked, wrinkled). Experiment included two commercial broomcorn varieties (Neoplanta plus and Prima), two row widths (50 and 70 cm) and six different distances among plants in row (5, 9, 13, 17, 21 and 25 cm). All trial variants included certain percentage of defective panicles formed under the influence of vegetative space per plant and agroclimatic conditions. Spike panicles generally appeared in high density and crooked panicles in low density crop. Lowest percentage of defective panicles appeared in crop with 100,000-120,000 plants per hectare. Considering yield, optimum broomcorn planting recommendation is 150,000-160,000 plants per hectare, with 50 cm between rows and 13 cm between plants, or 70 cm between rows and 9 cm between plants in a row.

Poljski ogledi koji su obuhvatali dve sorte sirka metlaša (Neoplanta plus i Prima), dva međuredna razmaka setve (50 i 70 cm) i 6 različitih razmaka biljaka u redu (5, 9, 13, 17, 21 i 25 cm) postavljeni su tokom dve godine (2002. i 2003.) na lokalitetu Šajkaš radi ispitivanja uticaja veličina vegetacionog prostora biljaka na formiranje deformisanih metlica (čačkalice, lulaste i kudrave metlice). U svim varijantama ogleda formira se određeni procenat deformisanih metlica. Na njihovo formiranje utiče godina i veličina vegetacionog prostora biljaka. U uslovima gustog sklopa formiraju se pretežno čačkalice, dok u retkom sklopu dominiraju lulaste metlice. Najmanji procenat deformacija se formira u porastu sa 100 000-120 000 biljaka na hektar. Uzimajući u obzir prinose, kao optimalno rešenje za setvu preporučuje se sklop od 150 000-160 000 biljaka na hektar, odnosno pri međurednom razmaku od 50 cm, setva na razmak između biljaka u redu 13 cm, a pri međurednom razmaku od 70 cm setva na razmak između biljaka u redu 9 cm.