The response of corn (Zea mays L.) cultivars to row spacing under weed interference condition | Odziv sort koruze (Zea mays L.) na razmik med setvenimi vrstami in vpliv plevela

Inglés. This study was carried out in order to study the response of corn cultivars to row spacing and weed interference at the Research Farm of Agricultural and Natural Resources Faculty, Razi University, Kermanshah, Iran in 2011. The experiment was a split block factorial based on a randomized complete block design with three replications. Factors consisted of three corn cultivars ('KSC 704', 'Simon' and 'Maxima') and three plant row spacings (45, 60 and 75 cm) under weeded and un-weeded conditions for all of the growing season. Results indicated that for all three corn cultivars, the highest weed dry mass occurred in the row spacing of 75 cm. Weed interference throughout the growing season reduced corn grain yield by 20 %. This condition also significantly decreased corn yield components except the 100-seed mass. Increasing plant row spacing increased weed density, while decreased corn yield by 16.5 %. Corn cultivars were significantly different in terms of the number of seed per ear and 100-seed mass, as 'KSC 704' and 'Simon' showed the highest values for these yield components, respectively. However, the number of ear per plant and grain yield were not significantly different between the corn cultivars under study.

Esloveno. V raziskavi je bil preučevan vpliv razmika med setvenimi vrstami in zapleveljenostjo pri treh sortah koruze na Research Farm of Agricultural and Natural Resources Faculty, Razi University, Kermanshah, Iran, v letu 2011. Poskus je bil izveden kot popolni naključni bločni poskus z deljenkami s tremi ponovitvami. Faktorje so predstavljali tri sorte koruze ('KSC 704', 'Simon' in 'Maxima') in trije razmiki med setvenimi vrstami (45, 60 in 75 cm) v razmerah brez plevela in s plevelom v celotni rastni sezoni. Rezultati so pokazali, da je bila največja masa plevelov pri vseh treh sortah pri razmiku setvenih vrst 75 cm. Zapleveljenost skozi celotno rastno sezono je zmanjšala pridelek zrnja koruze za 20 %. Te razmere so tudi značilno zmanjšale posamezne komponente pridelka razen mase 100-zrn. Povečan razmik med vrstami je povečal gostoto plevela, kar je zmanjšalo pridelek koruze za 16.5 %. Sorte koruze so se značilno razlikovale v številu zrn na storž in v masi 100-zrn, pri čemer sta imeli 'KSC 704' in 'Simon' največji vrednosti teh dveh komponent pridelka.Kljub temu se število storžev na rastlino in pridelek zrnja nista statistično značilno raziskovala med sortami, preučevanimi v tej raziskavi.