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Paper Information

Journal:   IRANIAN JOURNAL OF FIELD CROPS RESEARCH   2006 , Volume 4 , Number 2; Page(s) 243 To 252.
 
Paper: 

EFFECTS OF PLANTING PATTERN AND DENSITY ON GROWTH INDICES, YIELD AND YIELD COMPONENT OF CORN (ZEA MAYS) IN COMPETITION WITH REDROOT PIGWEED (AMARANTHUS RETROFELEXUS)

 
 
Author(s):  BARKHI A.R., RASHED MOHASEL M.H., NASIRI MAHALATI MAHDI, HOSSEINI SEYED MOHSEN
 
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Abstract: 
An experiment was conducted in 2002-2003 using split-split plot arrangement based on Rondomised Complete Block Design with three replications at Feiz Abad Agricultural Research Station of Qazvin, in order to study of planting patterns and corn densitis effect in competition with redroot pigweed. Main plots included two planting pattern of corn (P1: single row and P2: double row), sub plots included two corn densities (D1:7 and D2:10 plant/m2) and sub sub plots included 4 weed densities (C1:0, C2:2, C3:6, C4:12 plant/m2). Sampling conducted in 2-weekly intervals and growth indices evaluated. Results indicated that with increasing of weed density CGR, TDW, LAI, number of seeds in row, grain and ear yield decreased but plant height increased. Also LAI, CGR, TDW, number of weed seed and seed's weight of weed increased. By increasing in corn density LAI, CGR, TDW, ear and grain yield increased, but length and diameter of ear and number of seeds in row decreased. Also LAI and CGR of weed increased, but TDW was decreased. In double row planting pattern just CGR, LAI, TDW of corn were higher significantly than single row planting pattern. But single row planting of weed caused higher LAI, NAR, RGR, CGR and TDW of weed in comparison with double row planting pattern. In 2-way interaction, double row planting pattern and zero densities and 2 weeds/m2 had highest grain yield respectively. There were no significant differences for 3-way interactions but double row planting pattern x 10 plant density of com/m2 x zero weed/m2 had highest grain yield.
 
Keyword(s): CORN, WEED, REDROOT PIGWEED, PLANTING PATTERN, DENSITY, COMPETITION
 
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