ZEAMAYS در كشت خالص و مخلوط با ذرت AMARANTHUS RETROFLEXUS توليد و تسهيم ماده خشك تاج خروس

Dry matter production and partitioning of redroot pigweed (Ainaranthus retrofleuus) in pure and mixed culture with corn (Zea mays)

Dry matter production and partitioning of redroot pigwced (Amaranthus retro,flexus) in pure and mixed stand with corn (Zea :nays) was studied in an experiment conducted in 2001 in a field experiment at Ferdowsi University of Mashhad. A spilt plot arrangement with 3 replications was applied, main plots were planting dates (21 May, 6 June) and subplots were pure stand of corn at two densities (9.5 and 7.1 plant per m4) and pure and mixed stand of pigwced at two densities of corn. Results showed a close correlation between the transmission of photosynthetically active radiation (PAR) and leaf area index. Biomass production was linearly related to cumulative intercepted PAR. Total dry matter of pigwced reduced as radiation decreased along with increasing corn density. At both planting dates total dry matter of pigweed in pure stand was 2.5 fold pigwced dry matter in mixed stand. Results showed that when the level of competitive stress increased, pigweed allocated relatively more biomass to main stem than to branches.